KR102696291B1 - Rotating electric machine - Google Patents

Abstract

The present invention relates to a rotating electric machine, comprising: a housing having an accommodation space therein; a stator having a stator core disposed inside the housing and a stator coil wound around the stator core; a rotor disposed with a preset air gap from the stator; a cooling fluid injected into the interior of the housing; a cooling water circulation path formed in the housing so that the interior of the housing and the cooling water can exchange heat; a cooling fluid circulation unit formed in the housing so that the cooling fluid can be circulated through the interior of the housing; and an air gap supply unit connected in communication with the cooling fluid circulation unit and supplying the cooling fluid to the air gap by passing through the stator. As a result, the air gap between the stator and the rotor can be quickly cooled.

Description

Rotating electric machine {ROTATING ELECTRIC MACHINE}

The present invention relates to a rotating electric machine, and more specifically, to a rotating electric machine capable of promoting cooling of an air gap between a stator and a rotor.

As noted above, it includes a device for converting electrical energy into mechanical energy and a device for converting mechanical energy into electrical energy.

Specifically, these rotating electric machines include electric motors, generators and electric motors/generators.

The above rotating electric machine is configured to include a stator and a rotor that is arranged to be rotatable relative to the stator.

Some of the above rotating electric machines have a housing that forms an accommodation space inside. The housing has a housing body that forms an accommodation space with at least one side open inside, and a housing cover that is coupled to block the open area of the housing body.

The internal temperature of the above-mentioned rotating electric machine increases due to the heat generation of the stator and rotor when the above-mentioned rotating electric machine is driven. If the temperature of the above-mentioned rotating electric machine increases excessively, the output of the rotating electric machine may decrease due to an increase in electrical resistance, and there is also a problem in that the lifespan of the rotating electric machine is shortened due to the accelerated forced deterioration of the component parts.

Considering these problems, some of the rotating electric machines are equipped with air-cooling means that cool by forcibly blowing air. Such air-cooling means have limitations in cooling the rotating electric machine because the specific heat characteristic of air is relatively low.

In addition, other parts of the rotating electric machine are equipped with a water-cooling cooling means that cools using cooling water. Since such a water-cooling cooling means must be equipped with a cooling water jacket having a space for receiving the cooling water and/or a movement path mainly around the housing, there is a problem in that it increases the size and weight of the rotating electric machine. In addition, a rotating electric machine equipped with such a water-cooling cooling means has a limitation in cooling the electric coil because direct contact between the electric coil and the cooling water is difficult. In addition, there is a problem in that the temperature of the heat source in an area relatively far away from the cooling water locally increases excessively.

Considering these problems, another part of the rotating electric machine uses a cooling fluid cooling method that cools by injecting a cooling fluid into the inside of the housing.

However, in the case of a conventional rotating electric machine using a cooling method using a cooling fluid, there is a problem in that a local temperature rise area occurs in the stator and rotor depending on the location of the cooling fluid supply section that supplies the cooling fluid.

In addition, there is a problem that the temperature of an area where the cooling fluid has difficulty accessing, for example, an air gap area formed between the stator and the rotor, increases.

In addition, there is a problem that heat exchange of the rotor is insufficient, causing the temperature of the permanent magnets provided in the rotor to rise excessively, which may shorten the lifespan of the permanent magnets.

In addition, there is a problem in that the temperature at both left and right ends of the stator coil's end turn rises because the cooling fluid is supplied to the upper center of the end turn of the stator coil.

In addition, in some rotating electric machines, a cooling fluid path is formed between the stator and the rotor, which increases the air gap between the stator and the rotor, which may result in a decrease in output.

JP 2004-260898 A KR 1020140038598 A

Accordingly, the purpose of the present invention is to provide a rotating electric machine capable of cooling an air gap without increasing the air gap.

In addition, another object of the present invention is to provide a rotating electric machine capable of cooling the central region of the rotor.

In addition, another object of the present invention is to suppress a local temperature rise at the end turn of a stator coil.

A rotating electric machine according to the present invention for solving the above-mentioned problem is characterized in that a cooling fluid can be directly supplied to an air gap.

Specifically, the stator and the rotor are respectively arranged with an air gap between them, and the cooling fluid penetrates the stator and is directly supplied to the air gap, so that the air gap can be directly cooled by the cooling fluid.

Thereby, the inside of the stator and the outside of the rotor can be directly cooled by the cooling fluid, so that temperature rise can be suppressed.

A housing is provided on the outside of the above stator, and a cooling water circulation path is formed in the housing so that heat can be exchanged between the inside of the housing and the cooling water while circulating along the periphery of the housing.

The cooling fluid is injected into the interior of the housing, and a cooling fluid circulation section is formed in the housing so that the cooling fluid can circulate through the interior of the housing.

By this, the cooling fluid, whose temperature has increased through heat exchange inside the housing, can be cooled through heat exchange with the cooling water moving along the cooling water circulation path.

The above stator has a stator core provided inside the housing and a stator coil wound around the stator core.

The above stator is provided with an air gap supply unit, one end of which is connected to the cooling fluid circulation unit and the other end of which penetrates the stator and is connected to the air gap.

The above rotating electric machine may be configured to include a housing having an accommodation space therein; a stator having a stator core disposed inside the housing and a stator coil wound around the stator core; a rotor disposed with a preset air gap from the stator; a cooling fluid injected into the interior of the housing; a cooling water circulation path formed in the housing such that the interior of the housing and the cooling water can exchange heat; a cooling fluid circulation unit formed in the housing such that the cooling fluid can be circulated through the interior of the housing; and an air gap supply unit connected in communication with the cooling fluid circulation unit and supplying the cooling fluid to the air gap by passing through the stator.

According to one embodiment of the present invention, the air gap supply unit may be configured to have a supply nozzle having one end connected to the cooling fluid circulation unit and the other end extending through the stator to the air gap.

By this, the air gap can be cooled more quickly by supplying a cooling fluid of relatively low temperature directly into the air gap.

According to one embodiment of the present invention, the supply nozzle can be positioned at the center of the air gap along the axial direction.

By this, the central area of the rotor can be cooled more effectively.

According to one embodiment of the present invention, the supply nozzle may be configured to protrude from the inner surface of the stator into the air gap.

By this, a relatively low temperature cooling fluid can be brought into direct contact with the rotor, thereby cooling the rotor more quickly.

Additionally, the rotor can be maintained at a lower temperature.

According to one embodiment of the present invention, the housing may be configured to include a cooling water housing in which the cooling water circulation path is formed; and a cooling fluid housing arranged on the outside of the cooling water housing and in which the cooling fluid circulation section is formed.

Thereby, the interior of the housing can be cooled by the cooling water moving along the periphery of the housing and also by the cooling fluid injected into the interior of the housing, so that the stator and rotor inside the housing can be cooled more effectively.

According to one embodiment of the present invention, the coolant housing may have a cylindrical shape, and the coolant fluid housing may have a semicircular cross-sectional shape.

According to one embodiment of the present invention, a through-hole may be formed in the coolant housing so that the coolant fluid circulation part can communicate with the interior of the coolant housing.

A cooling fluid inlet may be formed in the above cooling fluid housing so as to be in communication with the penetration portion.

According to one embodiment of the present invention, the cooling fluid circulation unit may be configured with a cooling fluid pump that promotes circulation of the cooling fluid.

Here, the cooling fluid pump may be configured to be connected to a first cooling fluid path and a second cooling fluid path so that the cooling fluid can move, respectively.

Thereby, heat exchange between the cooling fluid and the cooling water is rapidly achieved, so that the cooling fluid can be cooled more quickly.

The first cooling fluid path and the second cooling fluid path may be spaced apart from each other along the axial direction and formed symmetrically to each other.

Thereby, the temperature of the cooling fluid moving along each of the first cooling fluid path and the second cooling fluid path can be maintained uniformly.

According to one embodiment of the present invention, the cooling fluid circulation unit has a confluence section where the first cooling fluid path and the second cooling fluid path join each other, and the air gap supply unit can be formed in the confluence section.

According to one embodiment of the present invention, the air gap supply unit may be configured to include a first air gap supply unit disposed at an upper end of the stator and a second air gap supply unit spaced apart from the first air gap supply unit along a circumferential direction of the stator.

Thereby, more cooling fluid can be supplied to the air gap.

According to one embodiment of the present invention, the air gap supply unit may further include a third air gap supply unit that is arranged spaced apart from the second air gap supply unit along the circumferential direction of the stator.

By this, more cooling fluid can be simultaneously supplied to a wider area in the air gap, so that the air gap can be cooled more quickly.

According to one embodiment of the present invention, the air gap supply unit may further be configured to include a third air gap supply unit positioned on an opposite side of the second air gap supply unit with the first air gap supply unit interposed therebetween.

Thereby, the left and right regions of the air gap can be cooled more uniformly based on the vertical center line passing through the upper center of the air gap.

According to one embodiment of the present invention, the cooling fluid circulation unit may be provided with an end-turn supply unit that supplies the cooling fluid to the end-turn of the stator coil.

By this, the temperature rise at the end turn of the stator coil can be suppressed.

According to one embodiment of the present invention, the end turn supply unit may be provided with a first end turn supply unit that supplies the cooling fluid to the upper center of the end turn of the stator coil, and a second end turn supply unit formed to be spaced apart from the first end turn supply unit in the circumferential direction.

By this, the end turn of the stator coil can be cooled more quickly.

According to one embodiment of the present invention, the end turn supply unit may further include a third end turn supply unit spaced apart from the second end turn supply unit in the circumferential direction.

By this, the temperature of the end turn of the stator coil can be further lowered.

According to one embodiment of the present invention, the third end turn supply unit may be arranged to supply the cooling fluid to the upper side of the left end or the right end along the left-right direction of the end turn.

By this, the temperature of the left or right end of the end turn of the stator coil, which has a relatively high temperature, can be effectively reduced.

According to one embodiment of the present invention, the cooling fluid housing may be configured to include a first cooling fluid housing and a second cooling fluid housing, each of which has the cooling fluid circulation section, and which are coupled to face each other on the outside of the cooling water housing.

By this, the heat exchange between the cooling water and the cooling fluid can be further increased.

According to one embodiment of the present invention, the air gap supply unit may be configured to include a first air gap supply unit formed in the first cooling fluid housing or the second cooling fluid housing and arranged to supply the cooling fluid to the upper center of the stator, a second air gap supply unit arranged to be spaced apart from the first air gap supply unit to one side in the circumferential direction, and a third air gap supply unit arranged to be spaced apart from the first air gap supply unit to the other side in the circumferential direction.

By this, the cooling fluid can be supplied evenly to the left and right areas of the air gap based on the vertical center line passing through the upper center of the air gap.

According to one embodiment of the present invention, the cooling fluid circulation unit of the first cooling fluid housing or the cooling fluid circulation unit of the second cooling fluid housing may be configured to include an end-turn supply unit that supplies the cooling fluid to the end-turn of the stator coil.

By this, a cooling fluid at a relatively low temperature can be supplied to the end turn of the stator coil.

According to one embodiment of the present invention, the end turn supply unit may be configured to include a first end turn supply unit arranged to supply the cooling fluid to the upper center of the end turn of the stator coil, a second end turn supply unit arranged spaced apart from the first end turn supply unit in one direction in the circumferential direction, and a third end turn supply unit arranged spaced apart from the end turn supply unit in the other direction in the circumferential direction.

By this, the end turn of the stator coil can be cooled more quickly and maintained at a lower temperature.

According to one embodiment of the present invention, the present invention may further comprise: a temperature sensing unit for sensing the temperature inside the housing; and a control unit for controlling the cooling fluid pump based on the temperature sensing result of the temperature sensing unit.

By this, the temperature inside the housing can be controlled (managed) more effectively.

Here, the cooling fluid pump is configured to be comprised of a plurality of units, and the temperature detection unit is configured to include a stator temperature detection unit that detects the temperature of the stator and a rotor temperature detection unit that detects the temperature of the rotor, and the control unit can be configured to control the cooling fluid pump so that the cooling fluid can be supplied to an area that requires more cooling based on the detection results of the stator temperature detection unit and the rotor temperature detection unit.

By this, the interior of the housing, the stator and the rotor can be effectively cooled by supplying cooling fluid to areas requiring further cooling.

As described above, according to one embodiment of the present invention, by providing an air gap supply unit that supplies cooling fluid to the air gap, the temperature rise of the air gap formed between the stator and the rotor can be suppressed.

In addition, the air gap supply unit has a supply nozzle extending through the stator into the air gap, thereby supplying a cooling fluid having a relatively low temperature to the air gap, thereby cooling the air gap more effectively.

In addition, the supply nozzle is configured to protrude into the air gap, thereby allowing the rotor to be cooled more effectively.

In addition, the cooling fluid circulation unit is provided with a first cooling fluid path and a second cooling fluid path through which the cooling fluid moves, respectively, so that the cooling fluid can be cooled more quickly.

In addition, the air gap supply unit is provided with a plurality of air gap supply units spaced apart along the circumferential direction of the air gap, thereby enabling the air gap to be cooled more quickly.

In addition, the air gap supply unit includes a first air gap supply unit provided at the top of the air gap, a second air gap supply unit spaced apart to one side of the circumference of the air gap, and a third air gap supply unit spaced apart to the other side of the circumference of the air gap, so that the left and right areas of the air gap can be uniformly cooled based on the vertical center line passing through the top of the air gap.

In addition, the cooling fluid housing is provided with a first cooling fluid housing and a second cooling fluid housing that are coupled to face each other on the outside of the cooling water housing, thereby enabling the cooling fluid to be cooled more quickly.

In addition, by providing a temperature sensing unit that senses the temperature inside the housing and a control unit that controls the cooling fluid pump based on the detection result of the temperature sensing unit, the temperature inside the housing can be effectively controlled (managed).

Figure 1 is a cross-sectional view of a rotating electric machine according to one embodiment of the present invention;
Figure 2 is a cross-sectional view along line II-II of Figure 1.
Figure 3 is a cross-sectional view along line Ⅲ-Ⅲ of Figure 1.
Fig. 4 is an enlarged view of the housing of Fig. 2;
Figure 5 is a cross-sectional view of the cooling fluid housing along line V-V of Figure 4.
Figure 6 is a drawing for explaining the operation of the air gap supply unit and end turn supply unit of Figure 1.
Figure 7 is a cross-sectional view of a rotating electric machine according to another embodiment of the present invention.
Fig. 8 is a cross-sectional view showing the interior of the cooling fluid housing of Fig. 7.
Figure 9 is a drawing for explaining the operation of the air gap supply unit and end turn supply unit of Figure 7.
FIG. 10 is an exploded perspective view of a cooling fluid housing of a rotating electric machine according to another embodiment of the present invention.
Fig. 11 is a cross-sectional view showing the interior of Fig. 10.
Figure 12 is an exploded perspective view of a cooling fluid housing of a rotating electric machine according to another embodiment of the present invention.
Fig. 13 is a cross-sectional view showing the interior of Fig. 12.
Fig. 14 is a cross-sectional view of a rotating electric machine according to another embodiment of the present invention.
Fig. 15 is a cross-sectional view of Fig. 14;
Fig. 16 is an exploded perspective view of the cooling fluid housing of Fig. 15.
Figure 17 is a drawing showing the interior of the first cooling fluid housing of Figure 16.
Figure 18 is a drawing showing the interior of the second cooling fluid housing of Figure 16.
Fig. 19 is a control block diagram of the rotating electric machine of Fig. 14.
Fig. 20 is a cross-sectional view of a rotating electric machine according to another embodiment of the present invention.
Fig. 21 is an exploded perspective view of the cooling fluid housing of Fig. 20.
Figure 22 is a drawing showing the interior of the first cooling fluid housing of Figure 21.
Figure 23 is a drawing showing the interior of the second cooling fluid housing of Figure 21.
Fig. 24 is a modified example of the cooling fluid housing of Fig. 20.
Figure 25 is a drawing showing the interior of the first cooling fluid housing of Figure 24.
Figure 26 is a drawing showing the interior of the second cooling fluid housing of Figure 24.

Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. In this specification, identical or similar reference numerals are given to identical or similar components in different embodiments, and their descriptions are replaced with the first description. The singular expression used in this specification includes plural expressions unless the context clearly indicates otherwise. In addition, when describing embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, it should be noted that the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and that the technical ideas disclosed in this specification should not be construed as being limited by the attached drawings.

Fig. 1 is a cross-sectional view of a rotating electric machine according to one embodiment of the present invention. As shown in Fig. 1, the rotating electric machine (100) of the present embodiment includes a housing (110), a stator (250), a rotor (280), a cooling water circulation path (133), a cooling fluid circulation unit (183), and an air gap supply unit (350).

The housing (110) above has an accommodation space inside. The housing (110) has, for example, a housing body (120) having an accommodation space with at least one side open, and a housing cover (150) coupled to block the opening area of the housing body (120).

The housing body (120) may be formed, for example, so that both sides are open. The housing cover (150) includes, for example, a first housing cover (151) coupled to one end of the housing body (120) and a second housing cover (153) coupled to the other end.

A sealed receiving space may be formed inside the housing (110). A sealing member (156) may be provided on the mutual contact surfaces of the housing body (120) and the housing cover (150) to hermetically block the gap. A sunken sealing member groove (154) may be formed on one of the mutual contact surfaces of the housing body (120) and the housing cover (150) so that the sealing member (156) can be partially received. The first housing cover (151) and the second housing cover (153) may each have a sunken sealing member groove (154) formed so that the sealing member (156) can be received.

A stator (250) is provided inside the housing (110). A rotor (280) is rotatably arranged inside the stator (250) with a preset air gap (G). The stator (250) and the rotor (280) may be implemented as an electric motor in which the rotor (280) rotates when power is applied to the stator (250). The stator (250) and the rotor (280) may be implemented as a generator in which electric energy is generated in the stator (250) when the rotor (280) is rotated by an external driving source. In addition, the stator (250) and the rotor (280) may be implemented as a generator-electric motor in which electric energy is generated in the stator (250) when the rotor (280) is rotated by an external driving source, and the rotor (280) rotates when power is applied to the stator (250). Hereinafter, an example will be described in which the stator (250) and rotor (280) are implemented as an electric motor in which the rotor (280) rotates when external power is applied.

The stator (250) may be press-fitted into, for example, the interior of the housing (110). The stator (250) may be configured to include, for example, a stator core (260) provided inside the housing (110) and a stator coil (270) wound around the stator core (260). A rotor receiving hole (264) may be formed through the center of the stator core (260) so that the rotor (280) may be rotatably received with a preset air gap (air gap: G). The stator core (260) may be formed by, for example, insulating and laminating a plurality of electrical steel plates (262). The electrical steel plates (262) of the stator core (260) have the rotor receiving hole (264) formed through the center thereof. A plurality of slots (266) and teeth (268) are provided around the rotor receiving hole (264). The plurality of slots (266) and teeth (268) are formed alternately along the circumference of the rotor receiving hole (264). The stator coil (270) can be formed in a preset pattern via the plurality of slots (266). The stator coil (270) can be formed by connecting a plurality of conductor segments, called a plurality of hairpins, which have, for example, a pair of insertion portions inserted into different slots (266) and a connection portion connecting each end of the pair of insertion portions, in a preset pattern. The stator coil (270) has end turns (272) that protrude in the axial direction from each of the two ends of the stator core (260).

The rotor (280) may be configured with, for example, a rotational axis (281) and a permanent magnet (300) that rotates around the rotational axis (281). The rotor (280) may be configured with, for example, a rotor core (290) that rotates around the rotational axis (281). The rotational axis (281) may be configured to protrude to both sides of the rotor core (290). The rotational axis (281) may be rotatably supported on both sides by bearings (285). The bearings (285) may be rotatably supported by, for example, a bearing coupling part (155) provided in the housing cover (150). The rotational axis (281) may be configured with at least one end protruding to the outside of the housing (110). A rotational shaft hole (294) may be formed through the center of the rotor core (290) so that the rotational shaft (281) can be inserted and coupled. The rotor core (290) may be formed, for example, by insulating and laminating a plurality of electrical steel plates (292). A plurality of permanent magnet insertion portions (296) may be formed through the rotor core (290) in the axial direction so that the permanent magnets (300) can be inserted, for example. In this embodiment, a case in which the permanent magnets (300) are configured to be inserted and coupled into the rotor core (290) is exemplified, but the permanent magnets (300) may also be configured to be coupled to the outer peripheral surface of the rotor core (290).

A cooling fluid (105) may be injected into the internal receiving space of the housing (110). The cooling fluid (105) may be implemented as, for example, oil having electrical insulating properties. The cooling fluid (105) may be implemented as, for example, transmission oil of an automobile.

The housing (110) may be provided with a cooling water circulation path (133) formed to allow cooling water to exchange heat with the interior. The housing (110) may be provided with a cooling fluid circulation part (183) in which the cooling fluid (105) is circulated through the interior of the housing (110).

The above housing (110) (housing body (120)) may be configured to include, for example, a cooling water housing (130) in which the cooling water circulation path (133) is formed, and a cooling fluid housing (180) that is arranged on the outside of the cooling water housing (130) and constitutes the cooling fluid circulation section (183).

The above-mentioned coolant housing (130) may have a cylindrical shape with both sides open. A coolant circulation path (133) may be formed inside (inside the wall) of the above-mentioned coolant housing (130).

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, FIG. 4 is an enlarged view of the housing of FIG. 2, FIG. 5 is a cross-sectional view of the cooling fluid housing taken along line V-V of FIG. 4, and FIG. 6 is a drawing for explaining the operation of the air gap supply unit and the end-turn supply unit of FIG. 1.

As shown in FIGS. 2 and 4, the coolant housing (130) includes, for example, an inner housing (130a), an outer housing (130b) that is spaced apart from the outside of the inner housing (130a) and arranged concentrically, and a plurality of partition walls (135) that are arranged axially and spaced apart from each other in the circumferential direction between the inner housing (130a) and the outer housing (130b) to partition the inner space.

The two ends of the coolant housing (130) are each blocked by side walls (left wall (130c) and right wall (130d) in the drawing) (see FIG. 1). The partition wall (135) has a reduced length compared to the length of the coolant housing (130), and one of the two ends is connected to one of the side walls (130c, 130d) of the coolant housing (130). Accordingly, a connecting passage (137) is formed between the partition wall (135) and the side walls (130c, 130d) of the coolant housing (130). The plurality of partition walls (135) are arranged in a zigzag shape so as to be alternately connected to the side walls (130c, 130d) of the coolant housing (130) along the circumferential direction of the coolant housing (130). Accordingly, the coolant circulation path (133) inside the coolant housing (130) is connected in a zigzag shape to form a single coolant circulation path (133). The inner surface (inner housing (130a)) of the coolant housing (130) may be configured to be in contact with, for example, the outer surface of the stator (250). The coolant circulation path (133) may be formed along the entire circumference of the stator (250). Accordingly, the outer surface of the stator (250) may be cooled by directly contacting and exchanging heat with the coolant housing (130).

The above-mentioned coolant circulation path (133) may be configured so that the coolant circulates in one direction (for example, clockwise in the drawing) along the circumference of the coolant housing (130). An inlet (133a) may be formed at the top of the coolant housing (130) so that coolant may be introduced, and an outlet (133b) may be formed so that the coolant may be discharged at a point spaced apart from the inlet (133a) in the counterclockwise direction in the drawing.

The above-described coolant housing (130) is connected to a coolant circulation unit (320) so that the coolant can be circulated via the coolant circulation path (133). Referring to FIG. 1, the coolant circulation unit (320) may be configured to include, for example, a coolant pipe (321) forming a coolant movement path and a coolant pump (323) connected to the coolant pipe (321) to promote the movement of the coolant. The coolant pipe (321) may be connected at both ends to one side (inlet (133a)) and the other side (outlet (133b)) of the coolant circulation path (133), respectively, so as to be mutually connected.

The above cooling water circulation unit (320) may be configured by, for example, having a cooling water heat exchanger (325) that is connected to the cooling water pipe (321) and in which the cooling water is radiated and heat exchanged. A cooling fan (330) that promotes the movement of air that comes into contact with the cooling water heat exchanger (325) when power is supplied may be provided on one side of the cooling water heat exchanger (325), for example, when power is supplied. The cooling fan (330) may be configured by, for example, having a fan unit (330a) having a plurality of blades and a driving motor (330b) that rotates and drives the fan unit (330a) when power is supplied.

The above-described cooling fluid housing (180) may be implemented, for example, in an approximately semicircular cross-sectional shape. The cooling fluid housing (180) may be coupled to the outside of the cooling water housing (130) to surround, for example, the lower central region and the upper central region of the cooling water housing (130). Since the upper and lower portions of the cooling fluid housing (180) actually extend in an arc shape toward the left region in the drawing along the circumferential direction, the cooling fluid housing (180) may be configured to have an arc-shaped cross-section that is slightly larger than a semicircle.

The above cooling fluid circulation unit (183) may be configured, for example, with the cooling fluid housing (180) and the cooling fluid pump (210) connected in communication with the cooling fluid housing (180).

The above-described cooling fluid housing (180) may be configured to include an inner housing (181a), an outer housing (181b) that is spaced apart from the outside of the inner housing (181a) and arranged concentrically, and a plurality of partition walls (185) that are provided between the outer housing (181b) and the inner housing (181a) to partition the internal space. The two ends of the outer housing (181b) and the inner housing (181a) may be configured to be blocked by two side walls (left wall (181c) and right wall (181d) in the drawing). The plurality of partition walls (185) of the above-described cooling fluid housing (180) have a shortened length along the axial direction, and one side is connected to one of the two side walls (181c, 181d) of the above-described cooling fluid housing (180), and the other side is spaced from the side walls (181c, 181d), so that a connecting passage (187) is formed therebetween. As a result, a cooling fluid path (195) connected in a zigzag shape is formed inside the above-described cooling fluid housing (180).

The above cooling fluid path (195) may be configured, for example, so that the cooling fluid (105) can move in one direction (for example, counterclockwise in the drawing) along the circumferential direction from the bottom of the cooling fluid housing (180). More specifically, for example, the cooling fluid (105) may be configured so that the cooling fluid (105) flows into the lower portion (upstream) of the cooling fluid housing (180) along the direction of movement of the cooling fluid (105), and the cooling fluid (105) flows out from the upper portion (downstream) of the cooling fluid (105).

The above-described cooling fluid circulation unit (183) may be connected to the inside of the housing (coolant housing (130)). A through-hole (141) may be formed at the bottom of the cooling fluid housing (130) so that the cooling fluid (105) inside the cooling fluid housing (130) may move to the cooling fluid housing (180). The cooling fluid housing (180) may be provided with a cooling fluid pump (210) that promotes the movement of the cooling fluid (105). The cooling fluid pump (210) may include a pump housing (210a), an impeller (210b) provided on one side of the inside of the pump housing (210a), and a driving motor unit (210c) that rotates the impeller (210b) when power is applied.

The cooling fluid housing (180) may be provided with a suction chamber (190). The suction chamber (190) may be provided with a suction port (192) that is connected to the through-hole (141). Accordingly, the cooling fluid (105) inside the cooling water housing (130) may be sucked into the inside of the suction chamber (190) through the through-hole (141) and the suction port (192). The suction chamber (190) may be mutually connected to the cooling fluid pump (210) by a suction pipe (212). The cooling fluid pump (210) may be mutually connected to the cooling fluid path (195) by a discharge pipe (214). The above cooling fluid housing (180) may be equipped with an air gap supply unit (350) that supplies the cooling fluid (105) to the air gap (G).

In the present embodiment, an inlet (133a) may be formed at the top of the coolant housing (130), and an outlet (133b) through which the coolant flows out may be formed at a point spaced apart in a counterclockwise direction from the inlet (133a). According to this configuration, the coolant has a relatively low temperature on the inlet (133a) side of the coolant housing (130) and a relatively high temperature on the outlet (133b) side that absorbs heat energy from the inside of the housing (110), and the coolant (105) absorbs heat energy from the inside of the housing (110), so that the temperature of the coolant (105) flowing into the inside of the coolant housing (180) is relatively high, and as it moves, heat is exchanged with the coolant housing (130), so that the temperature of the coolant (105) flowing out of the coolant housing (180) is relatively low. By this, the cooling fluid (105) can be effectively cooled by the cooling water.

The air gap supply unit (350) has, for example, a supply nozzle (355) which is connected at one end to the cooling fluid circulation unit (183) and extends to the air gap (G) at the other end. Accordingly, a cooling fluid (105) having a relatively low temperature can be directly supplied to the air gap (G). The supply nozzle (355) can be formed to protrude from, for example, the inner surface of the stator (250) to the air gap (G). Accordingly, the outer surface of the rotor (280) can be cooled more effectively. The supply nozzle (355) can be formed to correspond to, for example, adjacent slots (266) of the stator core (260). Accordingly, interference between the supply nozzle (355) and the stator coil (270) can be suppressed.

As shown in FIGS. 1 and 3, the cooling fluid circulation unit (183) may be provided with an end turn supply unit (360) that supplies the cooling fluid (105) to the end turn (272) of the stator coil (270). As a result, the end turn (272) of the stator coil (270) may be cooled. The end turn supply unit (360) may be formed by penetrating the cooling fluid housing (180) (inner housing). The cooling water housing (130) may be formed with an upper penetration unit (143) that is penetrated or cut off corresponding to the end turn supply unit (360) so that the cooling fluid (105) flowing out from the end turn supply unit (360) may flow into the interior of the cooling water housing (130).

Meanwhile, as illustrated in FIG. 5, a cooling fluid path (195) may be formed inside the cooling fluid housing (180) so that the cooling fluid (105) can move. The cooling fluid path (195) may include, for example, a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other. The first cooling fluid path (195a) may be formed on one side (left side in the drawing) of the inside of the cooling fluid housing (180). The second cooling fluid path (195b) may be formed on the other side (right side in the drawing) of the inside of the cooling fluid housing (180). A plurality of partition walls (185) may be formed inside the cooling fluid housing (180) to partition the internal space. The plurality of internal partition walls (185) of the cooling fluid housing (180) may include horizontal partition walls (185a) arranged axially inside the cooling fluid housing (180) and vertical partition walls (185b) arranged in the upper and lower directions of the cooling fluid housing (180). The vertical partition walls (185b) are provided in the central region of the cooling fluid housing (180). The first cooling fluid path (195a) and the second cooling fluid path (195b) are each provided with a plurality of horizontal partition walls (185a). Each of the plurality of horizontal partition walls (185a) has a shortened length in the axial direction so that a connecting passage (187) can be formed on one side, and are each arranged in a zigzag shape along the circumferential direction.

In the lower portion of the cooling fluid housing (180), inlets (195a1, 195b1) may be formed so that the cooling fluid (105) may flow into the first cooling fluid path (195a) and the second cooling fluid path (195b), respectively. The inlets (195a1, 195b1) may be formed in the lower region of the cooling fluid housing (180). The discharge pipe (214) of the cooling fluid pump (210) may be connected to the inlets (195a1, 195b1) so as to be mutually connected. A junction section (195c) in which the first cooling fluid path (195a) and the second cooling fluid path (195b) join may be formed in the cooling fluid housing (180). The above-mentioned junction section (195c) may be formed in the upper region of the cooling fluid housing (180). The above-mentioned junction section (195c) may be formed, for example, to correspond to the entire length of the cooling fluid housing (180). The air gap supply unit (350) may be connected to the central region of the above-mentioned junction section (195c). The end-turn supply unit (360) may be formed to penetrate through each of the two end regions of the above-mentioned junction section (195c).

In this embodiment, the end-turn supply unit (360) is exemplified as being formed in a hole shape by penetrating the inner bottom surface (inner housing (181a)) of the cooling fluid housing (180), but this is only an example, and the end-turn supply unit (360), like the air gap supply unit (350), may be configured to have a supply nozzle (not shown) in which one end is connected to be in communication with the cooling fluid circulation unit (183) and the other end extends to the air gap (G).

With this configuration, when driving is initiated, power is applied to the stator (250), and the rotor (280) rotates around the rotation axis (281) while interacting with the magnetic field formed by the stator coil (270). The temperature of the inside of the housing (110) (cooling water housing (130)) rises due to the heat generation of the stator (250) and the rotor (280).

In addition, when driving is initiated, the coolant pump (323) is driven and the coolant can be circulated through the coolant housing (130). As a result, heat generated inside the housing (110) (coolant housing (130)) can be absorbed and the inside of the housing (110) can be cooled.

Meanwhile, when operation is initiated, the cooling fluid pump (210) is driven, and the cooling fluid (105) can be cooled by heat exchange with the cooling water housing (130) while moving along the cooling fluid path (195) (the first cooling fluid path (195a) and the second cooling fluid path (195b)).

More specifically, the cooling fluid (105) in the inner bottom of the cooling water housing (130) can move to the suction chamber (190) of the cooling fluid housing (180) through the through-hole (14) and the suction port (192). The cooling fluid (105) inside the suction chamber (190) can be sucked into the cooling fluid pump (210) along the suction pipe (212). The cooling fluid (105) sucked into the cooling fluid pump (210) can be pressurized by the impeller (210b) and discharged through the discharge pipe (214). The cooling fluid (105) moved along the discharge pipe (214) can be introduced into the cooling fluid path (195).

The above cooling fluid (105) can be branched and moved in a zigzag shape along the first cooling fluid path (195a) and the second cooling fluid path (195b), respectively. As a result, heat exchange with the cooling water housing (130) can be increased, thereby promoting cooling of the cooling fluid (105).

The cooling fluids (105) that have moved along the first cooling fluid path (195a) and the second cooling fluid path (195b) may flow into the merging section (195c) and merge. Some of the cooling fluids (105) that have flowed into the merging section (195c) may flow out through the end-turn supply unit (360), as shown in Fig. 6. Others of the cooling fluids (105) that have flowed into the merging section (195c) may flow out through the air gap supply unit (350).

The cooling fluid (105) flowing out through each of the above end-turn supply units (360) can be moved to each end-turn (272) of the stator coil (270). As a result, the end-turn (272) whose cooling effect is relatively insufficient and whose temperature is relatively high because the conductors are relatively dense and in contact with the air can be cooled by the cooling fluid (105).

Meanwhile, the cooling fluid (105) flowing out through the air gap supply unit (350) rotates along the rotor (280) and comes into contact with the inner surface of the rotor receiving hole (264) of the stator (250) and the outer surface of the rotor (280), thereby cooling the inner surface of the stator core (260) and the outer surface of the rotor (280), respectively. In particular, the air gap supply unit (350) is arranged at the center of the stator core (260) and the center of the rotor (280) along the axial direction, thereby cooling the central region of the stator core (260) and the central region of the rotor (280), which are spaced farthest from the two ends of the stator core (260) and the two ends of the rotor (280), respectively, and are relatively prone to temperature increases. By this, the temperature rise in the inner central region of the stator core (260) and the central region of the rotor (280) can be suppressed.

The cooling fluid (105) that absorbs heat energy and has a temperature increased by coming into contact with the stator coil (270), the stator core (260), and the rotor (280), respectively, can drop (move) to the bottom of the cooling water housing (130). The cooling fluid (105) that has moved to the bottom of the cooling water housing (130) can flow into the suction chamber (190) of the cooling fluid housing (180) through the through-hole (141) and the suction port (192). The cooling fluid (105) moved to the cooling fluid housing (180) is pumped by the cooling fluid pump (210) and moves while exchanging heat with the cooling water, cooled, and then flows back into the cooling water housing (130) to cool the inside (stator coil (270), stator core (260), and rotor (280)) of the cooling water housing (130), thereby repeatedly performing the process. As a result, the inside (stator coil (270), stator core (260), and rotor (280)) of the housing (cooling water housing (130)) can be continuously cooled.

FIG. 7 is a cross-sectional view of a rotating electric machine according to another embodiment of the present invention, FIG. 8 is a cross-sectional view showing the inside of a cooling fluid housing of FIG. 7, and FIG. 9 is a drawing for explaining the operation of an air gap supply unit and an end-turn supply unit of FIG. 7.

As shown in Fig. 7, the rotating electric machine (100a) of the present embodiment has a housing (110), a stator (250), a rotor (280), and an air gap supply unit (350).

As described above, the housing (110) may be configured to include a cooling water housing (130) in which a cooling water circulation path is formed, and a cooling fluid housing (180) disposed on the outside of the cooling water housing (130) and in which a cooling fluid circulation section (183) is formed.

The above-mentioned coolant housing (130) has a cylindrical shape, and a sealed receiving space may be formed inside. A coolant circulation path (133) may be provided inside the coolant housing (130) so that coolant may be circulated. The coolant housing (130) has a receiving space formed inside with both sides open, and the first housing cover (151) and the second housing cover (153) described above may be respectively coupled to both ends. A sealed receiving space may be formed inside the coolant housing (130).

The cooling fluid housing (180) may be provided on the outside of the cooling water housing (130). The cooling fluid housing (180) may be implemented in, for example, a semicircular shape. The cooling fluid housing (180) may be coupled to the outside of the cooling water housing (130) to surround, for example, the bottom and top of the cooling water housing (130). A cooling fluid circulation unit (183) may be provided on the inside of the cooling fluid housing (180) so that the cooling fluid (105) may be circulated. The cooling fluid circulation unit (183) may be configured so that the cooling fluid (105) may be circulated through the inside of the cooling water housing (130). The cooling fluid housing (130) is provided with a through-hole (141) through which the cooling fluid (105) inside can move to the cooling fluid housing (180). An intake chamber (190) is formed inside the cooling fluid housing (180) through which the cooling fluid inside the cooling fluid housing (130) is sucked. The intake chamber (190) may have an intake port (192) formed through which it is communicated with the through-hole (141). A cooling fluid path (195) may be formed inside the cooling fluid housing (180) through which the cooling fluid (105) can move. The cooling fluid path (195) may include, for example, a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other.

The cooling fluid circulation unit (183) may be connected to an air gap supply unit (350) that supplies the cooling fluid (105) to the air gap (G) formed between the stator (250) and the rotor (280). The air gap supply unit (350) may be configured with a plurality of air gaps spaced apart along the circumferential direction of the air gap (G). Accordingly, more cooling fluid (105) may be supplied to the air gap (G) through the plurality of air gap supply units (350). In addition, by supplying the cooling fluid (105) to a plurality of locations spaced apart along the circumferential direction, the cooling fluid (105) may be simultaneously supplied to a wider area of the air gap (G).

The air gap supply unit (350) may include, for example, a first air gap supply unit (351) arranged to correspond to the upper end of the air gap (G) and a second air gap supply unit (352) arranged spaced apart from the first air gap supply unit (351) along the circumferential direction. The air gap supply unit (350) may include, for example, a third air gap supply unit (353) arranged spaced apart from the second air gap supply unit (352) along the circumferential direction. Each of the air gap supply units (351, 352) may include a supply nozzle (355) having one end connected to the cooling fluid circulation unit (183) and the other end extending to the air gap (G). Each of the above supply nozzles (355) may be configured to protrude from the inner surface of the rotor receiving hole (264) of the stator core (260), for example.

As illustrated in FIG. 8, a first cooling fluid path (195a) and a second cooling fluid path (195b) that are partitioned from each other may be formed inside the cooling fluid housing (180). The first cooling fluid path (195a) and the second cooling fluid path (195b) each have a plurality of partition walls (185) arranged in a zigzag shape. The first cooling fluid path (195a) and the second cooling fluid path (195b) may be formed almost symmetrically. A junction section (195c) in which the first cooling fluid path (195a) and the second cooling fluid path (195b) join is provided inside the cooling fluid housing (180). As described above, each of the above junction sections (195c) is provided with an end-turn supply unit (360) capable of supplying the cooling fluid (105) to each of the end-turns (272) of the stator coil (270). Each of the above air gap supply units (350) may be provided in each of the above junction sections (195c).

By this configuration, when operation is initiated, the rotor (280) rotates around the rotation axis (281), and the temperature of the inside of the housing (110) can rise due to the heat generation of the stator (250) and the rotor (280). In addition, when operation is initiated, the cooling water pump (323) and the cooling fluid pump (210) can each be driven.

When the cooling water pump (323) is driven, the cooling water is cooled by dissipating heat in the cooling water heat exchanger (325), and the cooled cooling water can be circulated through the cooling water housing (130). As a result, the cooling water moves along the cooling water circulation path (133) and absorbs heat energy inside the cooling water housing (130), thereby increasing its temperature, and moves to the cooling water heat exchanger (325) and dissipates heat, thereby decreasing its temperature. As a result, the inside of the cooling water housing (130), the stator (250), and the rotor (280) can be cooled.

When the above cooling fluid pump (210) is driven, the cooling fluid (105) inside the suction chamber (190) of the cooling fluid housing (180) is sucked in, and the cooling fluid (105) inside the cooling water housing (130) can be sucked into the suction chamber (190). The cooling fluid (105) discharged from the cooling fluid pump (210) can be cooled by heat-exchanging with the cooling water housing (130) while moving along the first cooling fluid path (195a) and the second cooling fluid path (195b). Some of the cooling fluid (105) cooled while moving along the first cooling fluid path (195a) and the second cooling fluid path (195b) can be supplied to each end turn (272) of the stator coil (270) through each end turn supply unit (360). Accordingly, each end turn (272) of the stator coil (270) can be cooled. Other parts of the cooling fluid (105) cooled while moving along the first cooling fluid path (195a) and the second cooling fluid path (195b) can be supplied to the air gap (G) through the first air gap supply unit (351), the second air gap supply unit (352), and the third air gap supply unit (353). Accordingly, the air gap (G) can be cooled more quickly.

The cooling fluid (105) whose temperature has increased through heat exchange with the end turn (272) and the air gap (G) can move to the bottom of the cooling water housing (130). The cooling fluid (105) in the inner bottom of the cooling water housing (130) can move to the first cooling fluid path (195a) and the second cooling fluid path (195b) via the through-hole (141), the suction port (192), the suction chamber (190), and the cooling fluid pump (210). The cooling fluid (105) moved to the first cooling fluid path (195a) and the second cooling fluid path (195b) is cooled as it moves upward, and is supplied again to the interior of the cooling water housing (130) to come into contact with the interior of the cooling water housing (130), the stator (250), and the rotor (280) to repeat the cooling process.

FIG. 10 is an exploded perspective view of a cooling fluid housing of a rotating electric machine according to another embodiment of the present invention, and FIG. 11 is a cross-sectional view showing the inside of FIG. 10. As shown in FIG. 10, the rotating electric machine (100) of the present embodiment has a housing (110), a stator (250), a rotor (280), and an air gap supply unit (350a).

The above housing (110) has a housing body (120) forming an accommodation space inside, and a first housing cover (151) and a second housing cover (153) coupled to an opening area of the housing body (120).

A stator (250) is provided inside the housing (110) (housing body (120)). The stator (250) has, for example, a stator core (260) and a stator coil (270) wound around the stator core (260). The stator coil (270) has end turns (272) that protrude in the axial direction from each end of the stator core (260).

The above rotor (280) has a rotation shaft (281), a rotor core (290) coupled to the rotation shaft (281), and a permanent magnet (300) coupled to the rotor core (290). The rotor core (290) may be provided with a permanent magnet insertion portion (296) that penetrates axially so that the permanent magnet (300) can be inserted, for example.

A cooling fluid (105) can be injected into the interior of the housing (110). Accordingly, the interior of the housing, the stator (250) and the rotor (280) can be cooled by the cooling fluid (105).

The housing (110) may be provided with a cooling water circulation path (133) to enable heat exchange between the inside of the housing (110) and the cooling water.

The housing (110) may be provided with a cooling fluid circulation unit (183) so that the cooling fluid (105) can be circulated through the interior of the housing (110).

The housing (110) may be provided with an air gap supply unit (350a) that is connected to the cooling fluid circulation unit (183) and supplies cooling fluid (105) to the air gap (G) through the stator (250).

The above housing (housing body (120)) can be configured with a coolant housing (130) and a coolant fluid housing (180a).

As described above, the coolant housing (130) may form an accommodation space with both sides open inside. The coolant housing (130) may have a cylindrical shape with both sides open. The coolant housing (130) may have the coolant circulation path (133) inside. The coolant circulation path (133) may be configured so that the coolant flows in one direction (for example, clockwise in the drawing) along the circumferential direction of the coolant housing (130). More specifically, for example, an inlet (133a) may be formed at the top of the coolant housing (130), and an outlet (133b) through which the coolant flows out may be formed at a point spaced apart from the inlet (133a) in the counterclockwise direction.

The cooling fluid housing (180a) may be configured to have, for example, an approximately semicircular cross-sectional shape. The cooling fluid housing (180a) may have a cooling fluid circulation section (183) formed therein in which the cooling fluid (105) is circulated. The cooling fluid housing (180a) may be coupled to, for example, the outside of the cooling water housing (130). More specifically, the cooling fluid housing (180a) may be coupled such that one end is disposed at the upper end of the cooling water housing (130) and the other end is disposed at the lower end of the cooling water housing (130).

The cooling fluid circulation unit (183) may be provided with a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other, as illustrated in FIG. 11. The first cooling fluid path (195a) and the second cooling fluid path (195b) may be arranged parallel to each other along the axial direction of the cooling fluid housing (180a). The first cooling fluid path (195a) and the second cooling fluid path (195b) may be configured by each having a plurality of partition walls (185) that are arranged axially inside the cooling fluid path (195) and spaced apart from each other in the circumferential direction in a zigzag manner. The above first cooling fluid path (195a) and second cooling fluid path (195b) can be configured to merge with each other at the merge section.

The cooling fluid housing (180a) may be provided with an end turn supply unit (360) that supplies the cooling fluid to the end turn (272) of the stator coil (270). The end turn supply unit (360) may be formed to penetrate the end turns (272) at both end areas of the junction section, respectively.

An air gap supply unit (350a) that supplies the cooling fluid (105) to the air gap (G) formed between the stator (250) and the rotor (280) may be connected to the cooling fluid housing (180a). The air gap supply unit (350a) may have a supply nozzle (355) that is connected at one end to the cooling fluid circulation unit (183) and extends to the air gap (G) at the other end. The supply nozzle (355) may be configured to protrude from the inner surface of the stator core (260), for example.

The above air gap supply unit (350a) may be configured in multiple units, for example. Accordingly, the cooling fluid (105) is supplied to multiple locations of the air gap (G), thereby promoting cooling of the air gap (G).

The above air gap supply unit (350a) may be formed, for example, at the confluence section (195c) of the cooling fluid path (195).

Meanwhile, the air gap supply unit (350a) may be configured to include a first air gap supply unit (351a) arranged to correspond to the upper end of the air gap (G), a second air gap supply unit (351b) arranged to be spaced apart from the first air gap supply unit (351a) in one direction (clockwise in the drawing) along the circumferential direction, and a third air gap supply unit (351c) arranged to be spaced apart from the first air gap supply unit (351a) in another direction (counterclockwise in the drawing) along the circumferential direction. As a result, areas on both sides of the air gap (G) can be effectively cooled based on an extension line (vertical center line) passing through the upper end and center of the air gap (G).

The second air gap supply unit (351b) and the third air gap supply unit (351c) may be formed symmetrically with respect to the vertical center line, for example. As a result, the areas on both sides of the air gap (G) can be cooled more effectively.

The above cooling fluid circulation unit (183) may be provided with a central extension unit (180a1) extending along the circumferential direction in the central area of the cooling fluid housing (180a).

The central extension (180a1) may extend circumferentially from the top of the cooling fluid housing (180a) and may have an extension path formed therein to communicate with the junction section (195c). The third air gap supply unit (351c) may be formed in the central extension (180a1). The supply nozzle (355) of the third air gap supply unit (351c) may be connected to the inner housing (181a) of the central extension (180a1).

By this configuration, when the operation is started and the cooling fluid pump (210) is driven, the cooling fluid (105) of the cooling fluid circulation unit (183) is circulated. More specifically, the cooling fluid (105) inside the suction chamber (190) is sucked by the cooling fluid pump (210) and discharged into the first cooling fluid path (195a) and the second cooling fluid path (195b), respectively. The cooling fluid (105) introduced into the first cooling fluid path (195a) and the second cooling fluid path (195b) respectively can be cooled by heat exchange with the cooling water while moving upward. The cooling fluid (105) that has moved upward is respectively moved to the junction section (195c) and supplied to each end turn (272) of the stator coil (270) via the end turn supply unit (360). By this, the end turns (272) of the stator coil (270) can be cooled, respectively. Another portion of the cooling fluid (105) moved to the junction section (195c) is moved to the central region of the junction section (195c), flows out to the air gap (G) through the air gap supply unit (350a), and can move in both directions (clockwise and counterclockwise in the drawing) along the circumferential direction of the air gap (G), respectively.

FIG. 12 is an exploded perspective view of a cooling fluid housing of a rotating electric machine (100) according to another embodiment of the present invention, and FIG. 13 is a cross-sectional view showing the interior of FIG. 12. As described above, the rotating electric machine (100) of the present embodiment includes a housing (110), a stator (250), a rotor (280), an air gap supply unit (350a), and an end-turn supply unit (360).

The stator (250) and rotor (280) are provided inside the housing (110).

The housing (110) may be configured with a coolant housing (130) and a coolant fluid housing (180b). The coolant housing (130) has a cylindrical receiving space formed inside with both sides open. A first housing cover (151) and a second housing cover (153) are coupled to both sides of the coolant housing (130). As a result, a sealed receiving space is formed inside the coolant housing (130). A coolant circulation path (133) is provided inside the coolant housing (130) so that coolant can circulate. The coolant fluid housing (180b) is provided on the outside of the coolant housing (130).

Meanwhile, the cooling fluid housing (180b) is configured to have an arc-shaped cross section, as shown in Fig. 12. More specifically, the cooling fluid housing (180b) may be configured to have an arc-shaped cross section larger than a semicircle. The cooling fluid housing (180b) may be configured to have, for example, an axial length that is almost the same as that of the cooling water housing (130).

More specifically, the lower part of the cooling fluid housing (180b) may be configured to surround the right side of the cooling fluid housing (130) in the drawing so as to correspond to the lower part of the cooling water housing (130). The cooling fluid housing (180b) may have an upper extension (180b1) formed in an arc shape extending from the upper end of the semicircle to the left side in the drawing from an extension line (vertical center line) connecting the center and the upper end of the cooling fluid housing (180b).

A cooling fluid circulation unit (183) in which the cooling fluid (105) circulates may be formed inside the cooling fluid housing (180b). The cooling fluid circulation unit (183) may have a suction chamber (190) that communicates with the inside of the cooling water housing (130). The suction chamber (190) may be formed inside the lower portion of the cooling fluid housing (180b). The cooling fluid circulation unit (183) may have a cooling fluid pump (210) that pumps the cooling fluid (105). The cooling fluid pump (210) may be connected to the suction chamber (190) by a suction pipe (212).

The above cooling fluid circulation unit (183) may be provided with a cooling fluid path (195) through which the cooling fluid (105) moves. As illustrated in FIG. 13, the cooling fluid path (195) may be provided with a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other. The first cooling fluid path (195a) and the second cooling fluid path (195b) may be arranged to be spaced apart from each other in the axial direction. The first cooling fluid path (195a) and the second cooling fluid path (195b) may be connected to the cooling fluid pump (210) and the discharge pipe (214), respectively.

The first cooling fluid path (195a) and the second cooling fluid path (195b) may each have a plurality of partition walls (185) arranged in the axial direction and spaced apart from each other along the circumferential direction but arranged in a zigzag shape. A merging section (195c) in which the cooling fluid (105) merges may be formed in the inner upper region of the cooling fluid housing (180b). The merging section (195c) may be formed including the upper inner space of the cooling water housing (130) and the inner space of the upper extension (180b1).

The above cooling fluid circulation unit (183) may be equipped with an air gap supply unit (350a) that supplies the cooling fluid (105) to the air gap (G). The air gap supply unit (350a) may be formed in a junction section (195c) where the cooling fluid (105) moved along the first cooling fluid path (195a) and the second cooling fluid path (195b) respectively merge.

The above air gap supply unit (350a) may be configured to include, for example, a first air gap supply unit (351a) arranged to correspond to the upper end of the air gap (G), a second air gap supply unit (351b) arranged spaced apart in one direction (clockwise in the drawing) along the circumferential direction from the first air gap supply unit (351a), and a third air gap supply unit (351c) arranged spaced apart in another direction (counterclockwise in the drawing) along the circumferential direction from the first air gap supply unit (351a). As a result, the left semicircular region and the right semicircular region of the cylindrical region of the air gap (G) can be evenly cooled with the vertical center line passing through the upper end of the air gap (G) as the center.

The second air gap supply unit (351b) and the third air gap supply unit (351c) may be arranged symmetrically, for example, with the vertical center line as the center. As a result, the left semicircular region and the right semicircular region of the air gap (G) can be cooled more evenly, thereby further reducing the occurrence of temperature deviation.

Meanwhile, the cooling fluid circulation unit (183) may be equipped with an end-turn supply unit (360) that supplies cooling fluid (105) to the end-turn (272) of the stator coil (270). The end-turn supply unit (360) may be formed at the junction section (195c) of the cooling fluid circulation unit (183).

The above end turn supply unit (360) may be configured to include, for example, a first end turn supply unit (361) arranged to correspond to the upper end of each end turn (272), a second end turn supply unit (362) arranged to be spaced apart from the first end turn supply unit (361) in one direction (clockwise in the drawing) along the circumferential direction, and a third end turn supply unit (363) arranged to be spaced apart from the first end turn supply unit (361) in another direction (counterclockwise in the drawing) along the circumferential direction. As a result, more cooling fluid (105) can be supplied to the end turn (272), so that the end turn (272) can be cooled more quickly. In addition, since the cooling fluid (105) is supplied to more locations (points) on the surface of the end turn (272), the surface of the end turn (272) can be cooled more quickly.

Here, the second end turn supply unit (362) may be arranged to correspond to one end (the right end in the drawing) among the two ends of the end turn (272), and the third end turn supply unit (363) may be arranged to correspond to the other end (the left end in the drawing) among the two ends of the end turn (272). Accordingly, the areas of the two ends of the end turn (272), where the cooling fluid (105) is relatively difficult to access among the surfaces of the end turn (272) and thus the areas with relatively high temperatures are formed, can be quickly cooled. Accordingly, the areas where the temperature rises locally among the surfaces of each end turn (272) can be eliminated, so that the surface temperature of the end turn (272) can be maintained generally low. The second end-turn supply unit (362) may be arranged at the junction section (195c), or may be formed at the first cooling fluid path (195a) or the second cooling fluid path (195b). In addition, the second end-turn supply unit (362) is arranged further upstream than the third end-turn supply unit (363) along the direction of movement of the cooling fluid (105). Due to this, the cooling water flowing out through the second end-turn supply unit (362) may have a relatively high temperature because the amount of heat exchange with the cooling water is relatively small, and therefore, a relatively large amount of cooling fluid (105) may be supplied for uniform cooling of the end-turn (272). That is, the second end turn supply unit (362) (supply nozzle) can be formed to have a larger flow cross-sectional area of the cooling fluid (105) than the third end turn supply unit (363) (supply nozzle).

In the present embodiment, although not specifically illustrated in the drawing, the second end turn supply unit (362) and the third end turn supply unit (363) may be configured to have a supply nozzle that is connected at one end to the cooling fluid housing (180b) and extends into the interior of the cooling water housing (130) by penetrating the cooling water housing (130) and extends to the left end area and the right end area of the end turn (272), respectively.

With this configuration, when the operation is started and the cooling fluid pump (210) is driven, the cooling fluid (105) of the suction chamber (190) can be sucked and discharged into the cooling fluid path (195). The cooling fluid (105) pumped by the cooling fluid pump (210) can flow into the first cooling fluid path (195a) and the second cooling fluid path (195b) and move upward. The cooling fluid (105) that moves upward along the first cooling fluid path (195a) and the second cooling fluid path (195b) can be cooled by heat exchange with the cooling water.

The cooling fluid (105) cooled by heat exchange with the cooling water can be supplied to the upper end (center), right end, and left end of the end turn (272) through the end turn supply unit (360), respectively. As a result, the end turn (272) of the stator coil (270) can be cooled quickly. In addition, since the cooling fluid (105) is simultaneously supplied to the areas spaced apart from each other along the circumferential direction of the end turn (272) by the first end turn supply unit (361), the second end turn supply unit (362), and the third end turn supply unit (363), the surface of the end turn (272) can be cooled more quickly. The cooling fluid (105) that comes into contact with the upper central region, the upper right end region, and the upper left end region of the end turn (272) to cool the end turn (272) may move downward, cool the lower central region, the lower right end region, and the lower left end region of the end turn (272), and then move to the lower side of the end turn (272). As a result, the entire circumference of the end turn (272) may be evenly cooled, and a local temperature rise of the end turn (272) may be suppressed.

Some of the cooling fluid (105) of the above-mentioned junction section (195c) can be supplied to the upper central region, the upper right region, and the upper left region of the air gap (G) through the first air gap supply unit (351a), the second air gap supply unit (351b), and the third air gap supply unit (351c), respectively. As a result, the upper region of the air gap (G) can be quickly cooled. The cooling fluid (105) that has cooled the upper region of the air gap (G) can evenly cool the entire circumferential region of the air gap (G) while moving along the air gap (G) to the lower region of the air gap (G). As a result, the air gap (G), where the access of the cooling fluid (105) is difficult and the discharge of heat energy is insufficient, and thus a region having a relatively high temperature is formed, can be quickly cooled. In addition, the central region inside the stator core (260) where the cooling fluid (105) is difficult to access and thus the heat energy discharge is insufficient, thereby forming a region with a relatively high temperature, can be quickly cooled, thereby suppressing a local temperature rise in the stator core (260). In addition, the central region in the axial direction of the rotor (280) where the cooling fluid (105) is difficult to access and thus forming a region with a relatively high surface temperature, can be quickly cooled. As a result, the shortening of the lifespan of the permanent magnet (300) due to excessive temperature rise can be suppressed.

FIG. 14 is a cross-sectional view of a rotating electric machine according to another embodiment of the present invention, and FIG. 15 is a cross-sectional view of FIG. 14. As shown in FIG. 14, the rotating electric machine (100b) of the present embodiment includes a housing (110), a stator (250), a rotor (280), and an air gap supply unit (350a).

A sealed receiving space is formed inside the above housing (110).

In the internal accommodation space of the housing (110), the stator (250) and the rotor (280) can be arranged to enable relative movement with a preset air gap (G) between them.

The above stator (250) is fixed so as to be in contact with the inner surface of the housing (110), and the rotor (280) can be accommodated to form the air gap (G) inside the stator (250).

Cooling fluid (105) can be injected into the accommodation space inside the housing (110).

A cooling water circulation path (133) may be formed inside the housing (110) (inside the wall) to allow cooling water to circulate.

A cooling water circulation unit (320) is connected to the cooling water circulation path (133) so that the cooling water can be circulated through the cooling water circulation path (133). The cooling water circulation unit (320) may be equipped with a cooling water pipe (321), a cooling water pump (323) connected to the cooling water pipe (321), and a cooling water heat exchanger (325) in which the cooling water is heat-exchanged. The cooling water circulation unit (320) may be equipped with a cooling fan (330) that rotates when power is supplied to promote air movement.

The housing (110) may be provided with a cooling fluid circulation unit (183) in which the cooling fluid (105) circulates. The housing (110) may be provided with a cooling water housing (130) in which the cooling water circulation path (133) is formed and a cooling fluid housing (180c) in which the cooling fluid circulation unit (183) is formed. The housing (110) may be provided with an air gap supply unit (350a) that supplies the cooling fluid (105) to the air gap (G). The air gap supply unit (350a) may be provided with a supply nozzle (355) having one end connected to the cooling fluid circulation unit (183) and the other end extending to the air gap (G). The supply nozzle (355) may be formed to protrude from the inner surface of the stator (250) toward the rotor (280).

As illustrated in Fig. 15, the cooling fluid housing (180c) may be provided with a first cooling fluid housing (180c1) and a second cooling fluid housing (180c2) that are coupled to face each other on the outside of the cooling water housing (130). The first cooling fluid housing (180c1) and the second cooling fluid housing (180c2) may be configured to each have a cooling fluid circulation section (183) through which the cooling fluid (105) may be circulated.

The first cooling fluid housing (180c1) and the second cooling fluid housing (180c2) may be configured to have, for example, a semicircular cross-sectional shape, respectively. The first cooling fluid housing (180c1) and the second cooling fluid housing (180c2) may have their lower portions arranged to correspond to the lower portion of the cooling water housing (130), and their upper portions arranged to correspond to the upper portion of the cooling water housing (130).

A suction chamber (190) may be formed in the lower interior of the first cooling fluid housing (180c1) and the second cooling fluid housing (180c2), respectively. Each of the suction chambers (190) may be communicated with the interior of the cooling water housing (130), respectively. A penetrating portion (141) may be formed in the cooling water housing (130) so as to be communicated with each of the suction chambers (190) of the first cooling fluid housing (180c1) and the second cooling fluid housing (180c2), respectively. A suction port (192) may be formed penetrating each of the suction chambers (190), respectively, so as to be communicated with the penetrating portion (141).

The first cooling fluid housing (180c1) and the second cooling fluid housing (180c2) may each be equipped with a cooling fluid pump (210). The cooling fluid pump (210) may include a first cooling fluid pump (210a) equipped in the first cooling fluid housing (180c1) and a second cooling fluid pump (210b) equipped in the second cooling fluid housing (180c2). The first cooling fluid pump (210a) may be connected to the suction chamber (190) of the first cooling fluid housing (180c1), and the second cooling fluid pump (210b) may be connected to the suction chamber (190) of the second cooling fluid housing (180c2).

Meanwhile, an air gap supply unit (350a) may be formed in the first cooling fluid housing (180c1) to supply cooling fluid (105) to the air gap (G). The air gap supply unit (350a) may be positioned to correspond to the upper end of the air gap (G).

An end turn supply unit (360) may be formed in the second cooling fluid housing (180c2) to supply cooling fluid (105) to the end turn (272) of the stator coil (270). The end turn supply unit (360) may be configured to include a first end turn supply unit (361) arranged to correspond to the upper end of the end turn (272), a second end turn supply unit (362) arranged to correspond to one end (the right end in the drawing) along the horizontal direction of the end turn (272), and a third end turn supply unit (363) arranged to correspond to the other end (the left end in the drawing) along the horizontal direction of the end turn (272). Although not specifically illustrated in the drawing in this embodiment, the first end-turn supply unit (361), the second end-turn supply unit (362), and the third end-turn supply unit (363) may each be configured to have a supply nozzle that is connected to the cooling fluid housing (180c) at one end and extends through the cooling water housing (130) at the other end.

FIG. 16 is an exploded perspective view of the cooling fluid housing of FIG. 15, FIG. 17 is a drawing illustrating the interior of the first cooling fluid housing of FIG. 16, and FIG. 18 is a drawing illustrating the interior of the second cooling fluid housing of FIG. 16.

As illustrated in Fig. 16, the second cooling fluid housing (180c2) may have an end extension portion (180c21) formed in an arc shape along the circumferential direction on both sides of the upper portion of the second cooling fluid housing (180c2).

In response to this, the first cooling fluid housing (180c1) may have a cut-off portion (180c11) formed along the circumferential direction at each end except for the center of the upper end of the first cooling fluid housing (180c1). The cut-off portion (180c11) may be formed to correspond to each of the end extension portions (180c21).

Accordingly, the first cooling fluid housing (180c1) and the second cooling fluid housing (180c2) can cooperatively form a cylindrical shape when coupled together.

As illustrated in FIG. 17, a cooling fluid path (195) through which the cooling fluid (105) moves is formed inside the first cooling fluid housing (180c1). The cooling fluid path (195) includes, for example, a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other. The first cooling fluid path (195a) and the second cooling fluid path (195b) may be formed to be spaced apart from each other in the axial direction. The first cooling fluid path (195a) and the second cooling fluid path (195b) may be configured to include a plurality of partition walls (185). The plurality of partition walls (185) may be arranged in a zigzag shape so as to be spaced apart from each other in the circumferential direction while being arranged along the axial direction. Accordingly, the cooling fluid (105) can move in a zigzag shape through the first cooling fluid path (195a) and the second cooling fluid path (195b) inside the first cooling fluid housing (180c1).

The first cooling fluid path (195a) and the second cooling fluid path (195b) may be configured to merge with each other. A merging section (195c) may be formed on the upper portion of the first cooling fluid housing (180c1) where the cooling fluids (105) merge with each other. The air gap supply section (350a) may be formed penetrating the merging section (195c). One end of the supply nozzle (355) may be connected to the air gap supply section (350a).

As illustrated in FIG. 18, a cooling fluid path (195) through which the cooling fluid (105) moves may be formed inside the second cooling fluid housing (180c2). The cooling fluid path (195) may include a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other. The first cooling fluid path (195a) and the second cooling fluid path (195b) are configured to be spaced apart from each other in the axial direction. The first cooling fluid path (195a) and the second cooling fluid path (195b) may be configured to have a plurality of partition walls (185). The plurality of partition walls (185) may have a shortened length in the axial direction, be spaced apart from each other in the circumferential direction, and be arranged in a zigzag shape with respect to each other. By this, the cooling fluid (105) can be moved in a zigzag shape along the first cooling fluid path (195a) and the second cooling fluid path (195b).

In the second cooling fluid housing (180c2), an end-turn supply part (360) may be formed to supply cooling fluid (105) to each of the end turns (272). The end-turn supply part (360) may be formed, for example, in the end regions of the first cooling fluid path (195a) and the second cooling fluid path (195b).

The above end-turn supply unit (360) may be configured to include, for example, a first end-turn supply unit (361) arranged to correspond to the upper end of the end-turn (272) of the stator coil (270), a second end-turn supply unit (362) arranged to be spaced apart from the first end-turn supply unit (361) in one direction (clockwise in the drawing) along the circumferential direction, as illustrated in FIGS. 16 and 18, and a third end-turn supply unit (363) arranged to be spaced apart from the first end-turn supply unit (361) in another direction (counterclockwise in the drawing) along the circumferential direction.

The third end turn supply unit (363) may be provided inside the end extension unit (180c21) of the second cooling fluid housing (180c2).

The first end-turn supply unit (361), the second end-turn supply unit (362), and the third end-turn supply unit (363) may be configured to have different flow cross-sectional areas, for example, in consideration of the temperature of the cooling fluid (105) flowing out through the corresponding end-turn supply units.

More specifically, the second end-turn supply unit (362) positioned relatively upstream along the direction of movement of the cooling fluid (105) may have relatively insufficient cooling, and thus its temperature may be higher than that of the cooling fluid (105) flowing out through the third end-turn supply unit (363). Considering this, the flow cross-sectional area of the second end-turn supply unit (362) may be formed to be larger than that of the third end-turn supply unit (363), for example, so that the surface temperature of the end-turn (272) may be made almost uniform.

Here, the size of the flow cross-sectional area of the first end-turn supply unit (361), the second end-turn supply unit (362), and the third end-turn supply unit (363) can be set by simultaneously considering the cooling amount according to the temperature distribution of the end-turn (272) and the temperature of the cooling fluid (105) flowing out through each end-turn supply unit.

Fig. 19 is a control block diagram of the rotating electric machine of Fig. 14. As shown in Fig. 19, the rotating electric machine (100b) of the present embodiment may be configured with a control unit (450) implemented as a microprocessor and having a control program. The control unit (450) may be configured to detect, for example, the temperature inside the housing and control the movement speed of the cooling fluid (105) of the first cooling fluid housing (180c1) and the second cooling fluid housing (180c2).

The control unit (450) may be communicatively connected to a temperature detection unit (460) that detects the temperature inside the housing (110). The temperature detection unit (460) may include, for example, a stator temperature detection unit (460a) that detects the temperature of the stator (250). The stator temperature detection unit (460a) may be configured to detect, for example, the temperature of the stator coil (270). The stator temperature detection unit (460a) may be configured to detect, for example, the temperature of the end turn (272).

The temperature sensing unit (460) may include, for example, a rotor temperature sensing unit (460b) that senses the temperature of the rotor (280). The rotor temperature sensing unit (460b) may be configured to sense, for example, the outer surface temperature of the rotor core (290). The rotor temperature sensing unit (460b) may also be configured to sense, for example, the temperature of the permanent magnet (300).

The above control unit (450) may be configured to control, for example, to increase the movement speed of the cooling fluid (105) of the second cooling fluid housing (180c2) when the detection temperature of the stator temperature detection unit (460a) is equal to or higher than the set temperature. The control unit (450) may be configured to control the second cooling fluid pump (210b) so that the rotation speed of the second cooling fluid pump (210b) can be increased when the detection temperature is equal to or higher than the set temperature.

The above control unit (450) may be configured to control, for example, the movement speed of the cooling fluid (105) of the first cooling fluid housing (180c1) to increase when the detection temperature of the rotor temperature detection unit (460b) is equal to or higher than the set temperature. The control unit (450) may be configured to control the first cooling fluid pump (210a) to increase the rotation speed of the first cooling fluid pump (210a) when the detection temperature is equal to or higher than the set temperature.

With this configuration, when driving is initiated, the rotor (280) rotates around the rotation axis (281). The temperature of the interior of the housing (110) (cooling water housing (130)) may rise due to the heat generation of the stator (250) and the rotor (280).

The above control unit (450) can control the first cooling fluid pump (210a) and the second cooling fluid pump (210b) to allow the cooling fluid (105) to be cooled while moving along the cooling fluid paths (195) of the first cooling fluid housing (180c1) and the second cooling fluid housing (180c2). The cooling fluid (105) moved along each cooling fluid path (195) of the cooling fluid housing (180c) can be supplied to the air gap (G) and the end turn (272) through the air gap supply unit (350a) and the end turn supply unit (360), respectively, to cool the air gap (G) and the end turn (272).

Meanwhile, the control unit (450) can control the movement speed of the cooling fluid (105) supplied to the air gap (G) and the end turn (272) based on the temperature detection result of the temperature detection unit (460).

More specifically, the control unit (450) can control the first cooling fluid pump (210a) so that the rotation speed of the first cooling fluid pump (210a) can increase when the temperature detected by the rotor temperature detection unit (460b) is higher than the set temperature. Accordingly, the movement speed of the cooling fluid (105) supplied through the air gap supply unit (350a) can increase. Accordingly, the flow rate of the cooling fluid (105) in contact with the rotor (280) increases, thereby promoting cooling of the rotor (280), and thus suppressing the temperature increase of the rotor (280).

The above control unit (450) can control the second cooling fluid pump (210b) to increase the rotation speed of the second cooling fluid pump (210b) when the temperature detected by the stator temperature detection unit (460a) is higher than the set temperature. Accordingly, the movement speed of the cooling fluid (105) supplied through the end-turn supply unit (360) increases, and the end-turn (272) can be cooled more quickly by coming into contact with a relatively large amount of cooling fluid (105). Accordingly, the temperature increase of the end-turn (272) can be suppressed, and the end-turn (272) can be maintained at a relatively low temperature.

FIG. 20 is a cross-sectional view of a rotating electric machine according to another embodiment of the present invention, and FIG. 21 is an exploded perspective view of the cooling fluid housing of FIG. 20. As shown in FIGS. 20 and 21, the rotating electric machine (100c) of the present embodiment has a housing (110), a stator (250), a rotor (280), an air gap supply unit (350a), and an end-turn supply unit (360).

The housing (110) forms a sealed receiving space inside. Inside the housing (110), the stator (250) and the rotor (280) are arranged to enable relative movement with a preset air gap (G) between them.

The housing (110) may be provided with a cooling water circulation path (133) so that the inside and the cooling water can exchange heat. A cooling water circulation unit (320) may be connected to the housing (110) so that the cooling water can be circulated through the cooling water circulation path (133).

A cooling fluid (105) can be injected into the internal space of the housing (110). A cooling fluid circulation unit (183) is provided in the housing (110) so that the cooling fluid (105) can circulate through the interior of the housing (110).

The above housing (110) may be equipped with a cooling water housing (130) in which the cooling water circulation path (133) is formed and a cooling fluid housing (180d) in which the cooling fluid circulation part (183) is respectively equipped.

The above cooling fluid housing (180d) can be, for example, coupled to the outside of the cooling water housing (130).

The above cooling fluid housing (180d) may include, for example, a first cooling fluid housing (180d1) and a second cooling fluid housing (180d2) that are coupled in face-to-face contact with each other with the cooling water housing (130) interposed therebetween.

The first cooling fluid housing (180d1) and the second cooling fluid housing (180d2) may be configured to have an approximately semicircular cross-sectional shape. The first cooling fluid housing (180d1) and the second cooling fluid housing (180d2) may be arranged so that their lower ends correspond to the lower ends of the cooling water housing (130), and their upper ends correspond to the upper ends of the cooling water housing (130).

The first cooling fluid housing (180d1) and the second cooling fluid housing (180d2) may each be provided with an intake chamber (190) that communicates with the interior of the cooling water housing (130) and into which the cooling fluid (105) is sucked. The interior of each cooling fluid housing (180d1, 180d2) may each be provided with an intake port (192) that communicates with a penetration portion (141) formed through the interior of the cooling water housing (130).

A first cooling fluid pump (210a) and a second cooling fluid pump (210b) can be connected to each of the above suction chambers (190).

A cooling fluid circulation unit (183) is provided inside each of the first cooling fluid housing (180d1) and the second cooling fluid housing (180d2) so that cooling fluid (105) can be circulated.

Meanwhile, as illustrated in FIG. 21, an air gap supply unit (350a) may be formed in the first cooling fluid housing (180d1) to supply cooling fluid (105) to the air gap (G).

An end turn supply unit (360) may be formed in the second cooling fluid housing (180d2) to supply cooling fluid (105) to the end turn (272) of the stator coil (270).

The above air gap supply unit (350a) may be formed, for example, in the central area of the air gap (G) along the axial direction.

The above air gap supply unit (350a) may be configured to include, for example, a first air gap supply unit (351a) arranged to correspond to the upper end of the air gap (G), a second air gap supply unit (351b) spaced apart in one direction (clockwise in the drawing) along the circumferential direction from the first air gap supply unit (351a), and a third air gap supply unit (351c) spaced apart in another direction (counterclockwise in the drawing) along the circumferential direction from the first air gap supply unit (351a).

A central extension portion (180d1a) extending in an arc shape in a counterclockwise direction along the circumference may be formed in the central region of the first cooling fluid housing (180d1). At both ends of the first cooling fluid housing (180d1), end cut portions (180d1b) cut in an arc shape in a clockwise direction along the circumference from an area corresponding to the upper end of the air gap (G) may be formed, respectively.

The above end-turn supply unit (360) can be formed at each end along the axial direction of the second cooling fluid housing (180d2).

Each of the above end-turn supply units (360) may be configured to include, for example, a first end-turn supply unit (361) arranged to correspond to the upper central region of each of the above end-turns (272), a second end-turn supply unit (362) spaced apart from the first end-turn supply unit (361) in one direction (clockwise in the drawing) along the circumferential direction, and a third end-turn supply unit (363) spaced apart from the first end-turn supply unit (361) in another direction (counterclockwise in the drawing) along the circumferential direction.

The second cooling fluid housing (180d2) may have, for example, a central cut-off portion (180d2a) formed in the central region corresponding to the extension section of the first cooling fluid housing (180d1). End extension portions (180d2b) extending clockwise along the circumferential direction may be formed at each end of the second cooling fluid housing (180d2).

According to this configuration, the first cooling fluid housing (180d1) and the second cooling fluid housing (180d2) can be coupled to each other along the radial direction with the cooling water housing (130) interposed therebetween. The first cooling fluid housing (180d1) and the second cooling fluid housing (180d2) can form a cylindrical shape when coupled to each other.

Meanwhile, FIG. 22 is a drawing illustrating the interior of the first cooling fluid housing of FIG. 21, and FIG. 23 is a drawing illustrating the interior of the second cooling fluid housing of FIG. 21.

As illustrated in Fig. 22, a cooling fluid circulation section (183) may be formed inside the first cooling fluid housing (180d1). The cooling fluid circulation section (183) has a cooling fluid path (195) through which heat is exchanged as the cooling fluid (105) moves. The cooling fluid path (195) has a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other.

The above cooling fluid circulation unit (183) may have a merging section (195c) in which cooling fluids (105) moving along the first cooling fluid path (195a) and the second cooling fluid path (195b) join. The central extension section (180d1a) may be formed to be in communication with the merging section (195c). The first air gap supply section (351a), the second air gap supply section (351b), and the third air gap supply section (351c) are formed inside the merging section (195c) and inside the central extension section (180d1a), respectively. More specifically, the first air gap supply unit (351a) and the second air gap supply unit (351b) may be formed in the internal space of the junction section (195c), and the third air gap supply unit (351c) may be formed in the internal space of the central extension unit (180d1a).

As illustrated in Fig. 23, the second cooling fluid housing (180d2) has a cooling fluid path (195) through which the cooling fluid (105) moves and heat is exchanged. The cooling fluid path (195) has a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other. The end extension portion (180d2b) may be formed at each end region of the first cooling fluid path (195a) and the second cooling fluid path (195b).

The first end turn supply unit (361), the second end turn supply unit (362), and the third end turn supply unit (363) may be formed at the ends of the first cooling fluid path (195a) and the second cooling fluid path (195b), respectively. Each of the third end turn supply units (363) may be arranged at each of the end extension units (180d2b).

Here, the first end-turn supply unit (361), the second end-turn supply unit (362), and the third end-turn supply unit (363) may be configured to have different flow cross-sectional areas.

By this configuration, when operation is initiated, the rotor (280) rotates around the rotation axis (281), and the control unit (450) can control the first cooling fluid pump (210a) and the second cooling fluid pump (210b) to be driven, respectively. Accordingly, the cooled cooling fluid (105) is supplied to the air gap (G) and each of the end turns (272), and the air gap (G) and the end turns (272) can be cooled, respectively.

The above control unit (450) can control the rotation speeds of each of the first cooling fluid pump (210a) and the second cooling fluid pump (210b) based on the detection results of the stator temperature detection unit (460a) and the rotor detection unit.

Accordingly, when the temperature of the stator (250) or the rotor (280) rises, this can be detected and the temperature of the stator (250) or the rotor (280) can be quickly suppressed from rising excessively.

Fig. 24 is a modified example of the cooling fluid housing of Fig. 20, Fig. 25 is a drawing illustrating the interior of the first cooling fluid housing of Fig. 24, and Fig. 26 is a drawing illustrating the interior of the second cooling fluid housing of Fig. 24.

As illustrated in FIG. 24, the cooling fluid housing (180e) of the present embodiment may include a first cooling fluid housing (180e1) and a second cooling fluid housing (180e2) that are coupled to each other on the outside of the cooling water housing (130) with the cooling water housing (130) interposed therebetween.

The first cooling fluid housing (180e1) and the second cooling fluid housing (180e2) may each be implemented with a semicircular cross-sectional shape. The lower ends of the first cooling fluid housing (180e1) and the second cooling fluid housing (180e2) may be arranged to correspond to the lower ends of the cooling water housing (130), and the upper ends of the first cooling fluid housing (180e1) and the second cooling fluid housing (180e2) may be arranged to correspond to the upper ends of the cooling water housing (130). Accordingly, the first cooling fluid housing (180e1) and the second cooling fluid housing (180e2) may cooperatively form a cylindrical shape when combined.

As illustrated in Fig. 25, the first cooling fluid housing (180e1) is provided with a first cooling fluid path (195a) and a second cooling fluid path (195b) that are connected in parallel with each other. The first cooling fluid path (195a) and the second cooling fluid path (195b) each have a plurality of partition walls (185) arranged in a zigzag shape.

The above first cooling fluid housing (180e1) has a merging section (195c) in which the cooling fluid (105) moving along the first cooling fluid path (195a) and the second cooling fluid path (195b) merge. The merging section (195c) may be formed at the upper end of the first cooling fluid housing (180e1).

An air gap supply unit (350a) for supplying the cooling fluid (105) to the air gap (G) may be formed in the inner central region of the first cooling fluid housing (180e1). The air gap supply unit (350a) may include a first air gap supply unit (351a) arranged to correspond to the upper end of the air gap (G) and a second air gap supply unit (351b) arranged to be spaced apart from the first air gap supply unit (351a) in one direction (lower in the drawing) along the circumferential direction.

An end-turn supply unit (360) for supplying the cooling fluid (105) to each end turn (272) of the stator coil (270) may be formed in each of the internal end regions of the first cooling fluid housing (180e1).

The above end-turn supply unit (360) may be equipped with a first end-turn supply unit (361) arranged to correspond to the upper central area of the end-turn (272) and a second end-turn supply unit (362) arranged spaced apart from the first end-turn supply unit (361) in one direction (lower in the drawing) along the circumferential direction.

As illustrated in Fig. 26, a first cooling fluid path (195a) and a second cooling fluid path (195b) connected in parallel to each other may be formed inside the second cooling fluid housing (180e2). A merging section (195c) may be formed inside the second cooling fluid housing (180e2) in which cooling fluids (105) moving along the first cooling fluid path (195a) and the second cooling fluid path (195b) merge.

In the above junction section (195c), a third air gap supply unit (351c) may be formed to supply the cooling fluid (105) to the air gap (G). The third air gap supply unit (351c) may be spaced apart from the first air gap supply unit (351a) in another direction (counterclockwise in FIG. 24) along the circumferential direction. The third air gap supply unit (351c) may be formed symmetrically with the second air gap supply unit (351b) with respect to, for example, an extension line (vertical center line) passing through the upper end of the air gap (G).

A third end-turn supply unit (363) for supplying cooling fluid (105) to the end-turn (272) may be formed in the internal end areas of the second cooling fluid housing (180e2). The third end-turn supply unit (363) may be configured to be spaced apart from the first end-turn supply unit (361) in another direction (counterclockwise in FIG. 24) along the circumferential direction.

The third end turn supply unit (363) may be formed symmetrically with the second end turn supply unit (362) with respect to, for example, an extension line (vertical center line) passing through the upper end of the end turn (272). The second end turn supply unit (362) and the third end turn supply unit (363) may be arranged to correspond to, for example, the upper side of the left end region and the upper side of the right end region of the end turn (272), respectively.

With this configuration, when operation is initiated, the rotor (280) rotates around the rotation axis (281), and the control unit (450) can control the first cooling fluid pump (210a) and the second cooling fluid pump (210b) to be driven, respectively.

When the first cooling fluid pump (210a) and the second cooling fluid pump (210b) are driven, the cooling fluid (105) inside the cooling water housing (130) is cooled while moving along the first cooling fluid path (195a) and the second cooling fluid path (195b) of each cooling fluid housing. Some of the cooled cooling fluid (105) that has moved to the upper portion of the first cooling fluid housing (180e1) can be supplied to the air gap through the first air gap supply unit (351a) and the second air gap supply unit (351b), respectively. Another portion of the cooling fluid (105) moved upward can be supplied to each end turn (272) of the stator coil (270) through the first end turn supply unit (361) and the second end turn supply unit (362).

Some of the cooling fluid (105) moved to the upper part of the interior of the second cooling fluid housing (180e2) may be supplied to the air gap (G) through the third air gap supply unit (351c). Others of the cooling fluid (105) moved to the upper part of the interior of the second cooling fluid housing (180e2) may be supplied to each of the end turns (272) through each of the third end turn supply units (363).

By this, the air gap (G) and end turn (272) can be cooled respectively.

Meanwhile, the control unit (450) detects the internal temperature of the housing (110) by the temperature detection unit (460), and if the internal temperature of the housing (110) is lower than a preset temperature, can control either the first cooling fluid pump (210a) or the second cooling fluid pump (210b) to be selectively driven.

Here, the control unit (450) may be configured to, for example, drive the first cooling fluid pump (210a) and stop the driving of the second cooling fluid pump (210b) if the internal temperature of the housing (110) is less than or equal to a preset first range from the set temperature.

In addition, the control unit (450) may be configured to drive the second cooling fluid pump (210b) and stop driving the first cooling fluid pump (210a) when the internal temperature of the housing (110) is less than or equal to a second width that is greater than the first width and the difference from the set temperature, for example.

In addition, the control unit (450) may be configured to stop the operation of both the first cooling fluid pump (210a) and the second cooling fluid pump (210b) if, for example, the difference between the internal temperature of the housing (110) and the set temperature is less than or equal to a third width that is greater than the second width.

In the above, specific embodiments of the present invention have been illustrated and described. However, the present invention may be implemented in various forms without departing from the spirit or essential characteristics thereof, and the embodiments described above should not be limited by the contents of the detailed description.

In addition, even if the embodiments are not specifically listed in the detailed description described above, they should be broadly interpreted within the scope of the technical idea defined in the appended claims. In addition, all changes and modifications included within the technical scope of the above claims and their equivalents should be encompassed by the appended claims.

Claims (20)

A housing that forms a receiving space inside;
A stator having a stator core disposed inside the housing and a stator coil wound around the stator core;
A rotor positioned with a preset air gap between the stator and the rotor;
Cooling fluid injected into the interior of the above housing;
A cooling water circulation path formed in the housing so that the inside of the housing and the cooling water can exchange heat;
A cooling fluid circulation unit formed in the housing so that the cooling fluid can circulate through the interior of the housing; and
An air gap supply unit is connected in communication with the cooling fluid circulation unit and supplies the cooling fluid to the air gap through the stator;
The above air gap supply unit has one end connected to the cooling fluid circulation unit and the other end has a supply nozzle extending through the stator to the air gap.
The above supply nozzle is configured to protrude from the inner surface of the stator into the air gap,
The above housing comprises a cooling water housing in which the cooling water circulation path is formed; and a cooling fluid housing arranged on the outside of the cooling water housing and in which the cooling fluid circulation section is formed;
The above cooling fluid circulation unit is equipped with a cooling fluid pump that promotes circulation of the cooling fluid,
The above cooling fluid pump is connected to a first cooling fluid path and a second cooling fluid path so that the cooling fluid can move respectively.
A rotating electric machine, wherein the cooling fluid circulation section has a junction section where the first cooling fluid path and the second cooling fluid path join each other, and the air gap supply section is formed in the junction section. delete delete In the first paragraph,
The above coolant housing has a cylindrical shape,
A rotating electric machine in which the above cooling fluid housing has a semicircular cross-sectional shape. delete In paragraph 4,
The above coolant housing has a penetration formed therein so that the coolant fluid circulation part can communicate with the interior of the coolant housing.
A rotating electric machine in which a cooling fluid inlet is formed in the above cooling fluid housing so as to be in communication with the above penetration portion. In Article 6,
A temperature sensing unit for sensing the temperature inside the housing; and
A rotating electric machine further comprising a control unit that controls the cooling fluid pump based on the temperature detection result of the temperature detection unit. delete delete In Article 7,
The above air gap supply unit has a first air gap supply unit arranged at the top of the stator and a second air gap supply unit arranged spaced apart from the first air gap supply unit along the circumferential direction of the stator.
A rotating electric machine, wherein the air gap supply unit further comprises a third air gap supply unit arranged spaced apart from the second air gap supply unit along the circumferential direction of the stator. In Article 7,
The above air gap supply unit has a first air gap supply unit arranged at the top of the stator and a second air gap supply unit arranged spaced apart from the first air gap supply unit along the circumferential direction of the stator.
A rotating electric machine, wherein the air gap supply unit further comprises a third air gap supply unit positioned on the opposite side of the second air gap supply unit with the first air gap supply unit interposed therebetween. In Article 7,
The above cooling fluid circulation unit is provided with an end turn supply unit that supplies the cooling fluid to the end turn of the stator coil.
A rotating electric machine having a first end turn supply unit that supplies the cooling fluid to the upper center of the end turn of the stator coil and a second end turn supply unit formed to be spaced apart from the first end turn supply unit in the circumferential direction. delete In Article 12,
The above end turn supply unit further comprises a third end turn supply unit spaced apart from the second end turn supply unit in the circumferential direction.
A rotating electric machine in which the third end-turn supply unit is arranged so as to supply the cooling fluid to the upper side of the left end or the right end along the left-right direction of the end-turn. delete In Article 7,
The above cooling fluid housing comprises a first cooling fluid housing and a second cooling fluid housing, each of which has the cooling fluid circulation section, and which are coupled to face each other on the outside of the cooling water housing.
A rotating electric machine comprising: a first air gap supply unit formed in the first cooling fluid housing or the second cooling fluid housing and arranged to supply the cooling fluid to the upper center of the stator; a second air gap supply unit arranged to be spaced apart from the first air gap supply unit to one side in the circumferential direction; and a third air gap supply unit arranged to be spaced apart from the first air gap supply unit to the other side in the circumferential direction. delete In Article 7,
The above cooling fluid housing comprises a first cooling fluid housing and a second cooling fluid housing, each of which has the cooling fluid circulation section, and which are coupled to face each other on the outside of the cooling water housing.
The cooling fluid circulation section of the first cooling fluid housing or the cooling fluid circulation section of the second cooling fluid housing is provided with an end turn supply section that supplies the cooling fluid to the end turn of the stator coil.
The above end-turn supply unit is a rotating electric machine comprising a first end-turn supply unit arranged so as to supply the cooling fluid to the upper center of the end-turn of the stator coil, a second end-turn supply unit arranged spaced apart from the first end-turn supply unit in one direction in the circumferential direction, and a third end-turn supply unit arranged spaced apart from the first end-turn supply unit in the other direction in the circumferential direction. delete delete

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