WO2019151186A1 - Electric motor assembly - Google Patents

Abstract

The present invention relates to an electric motor assembly. This electric motor assembly (1) is provided with: a motor casing (10); an inverter case (21); a cooling fan (25); a fan cover (51); a first fan cover-side straightening projection (55) and a second fan cover-side straightening projection (5); and a first inverter case-side straightening projection (56) and a second inverter case-side straightening projection (56) which extend outward from the outer surface of the inverter case (21). The first fan cover-side straightening projection (55) and the first inverter case-side straightening projection (55) are disposed parallel on a straight line, and the second fan cover-side straightening projection (56) and the second inverter case-side straightening projection (56) are disposed parallel on a straight line.

Description

Electric motor assembly

The present invention relates to an electric motor assembly.

In recent years, there has been an increasing demand for higher efficiency and smaller motors. One of the methods for realizing high motor efficiency is a drive control technique using an inverter. In such a drive control technique, control for making the motor highly efficient is performed according to the drive environment and drive state of the motor.

Regarding motor miniaturization, the motor core may be designed so that its shape is optimized, and a method of reducing the size of the motor itself may be employed. On the other hand, an inverter is necessary to perform drive control for realizing high-efficiency driving of the motor. Therefore, both a motor and an inverter are installed.

An electric motor assembly including an inverter part and a motor part is known. In such an electric motor assembly, the inverter unit includes an inverter and an inverter case that houses the inverter. The motor unit includes a motor including a rotor and a stator that rotate the drive shaft, and a motor casing that houses the motor.

Since the inverter and the motor are heat sources, when the motor assembly is operated, the inverter heat is transferred to the inverter case, and the inverter case becomes hot. Similarly, the heat of the motor is transmitted to the motor casing, and the motor casing becomes hot. As a result, the motor assembly as a whole becomes very hot. Accordingly, the electric motor assembly includes a fan fixed to the drive shaft. A fan rotates with rotation of a drive shaft, and cools the outer surface of an inverter case and the outer surface of a motor casing (for example, refer to patent documents 1 and patent documents 4).

Japanese Unexamined Patent Publication No. 2016-201998 Japanese Utility Model Publication No. 62-107546 Japanese Utility Model Publication No. 58-37766 JP-A-8-289505 Japanese Patent Laid-Open No. 10-271863 Japanese Patent Laid-Open No. 11-27903

However, since each of the motor and the inverter is a heat generation source, the motor and the inverter are likely to be at high temperatures. When motors and inverters become hot, there is concern about motor component and / or inverter component burnout, reduced motor component and / or inverter component life, and / or motor efficiency. The Under such circumstances, it is essential to employ a cooling structure for the motor and the inverter.

Therefore, an object of the present invention is to provide an electric motor assembly capable of efficiently cooling a motor and an inverter.

The fan can send air to the outer surface of the inverter case and the outer surface of the motor casing by its rotation, but cannot send air to the space where the inverter as a heat source is arranged, that is, the internal space of the inverter case. Therefore, the internal space of the inverter case may not be sufficiently cooled. As a result, this interior space can be very hot.

The inverter components are greatly affected by the temperature of the internal space of the inverter case. If the internal space of the inverter case is high, the inverter components may be damaged or the life of the inverter components may be reduced. May become shorter. Therefore, it is important to cool the inverter by lowering the temperature of the internal space of the inverter case.

As a method for cooling the inverter, a method of directly sending air in the external space to the internal space of the inverter case is conceivable. However, in such a method, foreign matter such as dust or water droplets may enter the internal space of the inverter case. Since the inverter is an electrical component, if such foreign matter adheres to the inverter, the inverter may break down.

Therefore, an object of the present invention is to provide an electric motor assembly that can reduce the temperature of an inverter.

One aspect stores a motor casing that houses a rotor and a stator that rotate a drive shaft, and an inverter that is disposed adjacent to the rotor and the stator, along the axial direction of the drive shaft. An inverter case connected in series to the motor casing; a cooling fan disposed outside the inverter case and fixed to the drive shaft; and a fan cover connected to the inverter case so as to cover the cooling fan; The first fan cover side rectifying protrusion and the second fan cover side rectifying protrusion extending inward from the inner surface of the fan cover, and the first inverter case side rectifying protrusion extending outward from the outer surface of the inverter case And a second inverter case side rectification protrusion, the first fan cover side rectification protrusion and the first inverter case side rectification protrusion The inverter case side rectifying protrusions are arranged in a straight line, and the second fan cover side rectifying protrusions and the second inverter case side rectifying protrusions are arranged in a straight line. An electric motor assembly is characterized.

In a preferred aspect, the electric motor assembly further includes a motor casing side rectification protrusion that extends outward from an outer surface of the motor casing, and the motor casing side rectification protrusion includes the first fan cover side rectification protrusion and the first fan cover side rectification protrusion. The first inverter case side rectification protrusion is arranged in a straight line, or the second fan cover side rectification protrusion and the second inverter case side rectification protrusion are arranged in a straight line. Features.
In a preferred aspect, the motor casing side rectifying protrusion is a first motor casing side rectifying protrusion, and the electric motor assembly further includes a second motor casing side rectifying protrusion extending outward from an outer surface of the motor casing. The first motor casing side rectification protrusion and the first fan cover side rectification protrusion and the first inverter case side rectification protrusion are arranged in a straight line, and the second motor casing side rectification protrusion is arranged in a straight line. The motor casing side rectification protrusion is arranged so as to be aligned with the second fan cover side rectification protrusion and the second inverter case side rectification protrusion.
In a preferred aspect, the electric motor assembly further includes a positioning structure for determining a relative position between the motor casing and the inverter case.

In a preferred aspect, the motor casing includes a motor frame to which the stator is fixed, and a bracket for closing an opening end of the motor frame, and the inverter case is an inverter disposed adjacent to the bracket. The positioning structure includes a first vertical positioning hole formed in the motor frame and the bracket and extending in a direction perpendicular to an axial direction of the drive shaft, and formed in the inverter frame and the bracket. A second vertical positioning hole extending in a direction perpendicular to the axial direction of the drive shaft, and a first positioning tool inserted into the first vertical positioning hole and determining a relative position between the motor frame and the bracket; , Inserted into the second vertical positioning hole, and the inverter frame and the bracket Characterized in that a second positioning device for determining the relative position of the bets.

In a preferred aspect, the motor casing includes a motor frame to which the stator is fixed, and a bracket for closing an opening end of the motor frame, and the inverter case is an inverter disposed adjacent to the bracket. A frame and a cover member that closes an open end of the inverter frame, and the positioning structure is formed in the motor frame and the bracket, and extends in parallel with an axial direction of the drive shaft. A second parallel positioning hole formed in the cover member and extending in parallel with the axial direction of the drive shaft, and the first parallel in a state where the bracket and the inverter frame are sandwiched between the cover member and the motor frame. A through hole inserted into the positioning hole and the second parallel positioning hole; For example, characterized in that is.

In a preferred aspect, the motor casing includes a motor frame to which the stator is fixed, and a bracket for closing an opening end of the motor frame, and the inverter case is an inverter disposed adjacent to the bracket. The positioning structure is formed on the bracket and extends toward the motor frame; and a first fitting groove formed on the motor frame into which the first protrusion is fitted. And a second protrusion formed on the bracket and extending toward the inverter frame, and a second fitting groove formed on the inverter frame and into which the second protrusion is fitted.

In a preferred aspect, the fan cover covers the inverter case and the motor casing, and extends along the axial direction of the drive shaft.
In a preferred aspect, the fan cover includes a cylinder part that covers at least a part of the motor casing, and a fan case part integrally formed with the cylinder part.
In a preferred aspect, the fan cover includes a fan frame that covers at least a part of the motor casing, and a fan housing that is configured separately from the fan frame.

In another aspect, the drive shaft, a motor that rotates the drive shaft, a motor casing in which the motor is disposed, an inverter that controls the operation of the motor, the inverter is disposed in the interior, and the drive An inverter case through which the shaft passes, a cooling fan disposed adjacent to the inverter case, fixed to an end of the drive shaft, and disposed inside the inverter case so as to cover the periphery of the drive shaft, The motor is provided with a communication space that is interposed between the cylindrical wall that forms a flow path of the air that flows by rotation of the cooling fan, the motor casing, and the inverter case, and that communicates the flow path of the air and the external space. An electric motor assembly comprising a spacer formed between a casing and the inverter case.

In a preferred aspect, the inverter case is adjacent to the cooling fan and has a first through-hole through which the drive shaft passes, and a cooling fan side cover member adjacent to the motor casing and the second through which the drive shaft passes. A motor casing side cover member having a through hole, and the cylindrical wall includes one end connected to the first through hole of the cooling fan side cover member and the first of the motor casing side cover member. And the other end connected to the two through holes.
In a preferred aspect, the motor casing includes a motor side plate adjacent to the motor casing side cover member, the spacer is disposed between the motor casing side cover member and the motor side plate, and the motor side plate. It comprises a plurality of protruding members arranged at equal intervals along the circumferential direction.
In a preferred aspect, the motor casing includes a motor side plate adjacent to the motor casing side cover member, and the spacer is disposed between the motor casing side cover member and the motor side plate and communicates with the inside. A ring member having a space is provided, and the ring member has an air hole that constitutes a part of the communication space.

In a preferred aspect, the cylindrical wall, the cooling fan side cover member, and the motor casing side cover member are separate members, and one end portion of the cylindrical wall and the first through hole of the cooling fan side cover member. Is disposed between the other end of the cylindrical wall and the second through hole of the motor casing side cover member. It is characterized by.
In a preferred aspect, the cylindrical wall is an integrally formed member with any one of the cooling fan side cover member and the motor casing side cover member, and the cylindrical wall and the cooling fan side cover member are integrated. In the case of a molded member, a seal member is disposed between the other end portion of the cylindrical wall and the second through hole of the motor casing side cover member, and the cylindrical wall and the motor casing side When the cover member is an integrally formed member, a seal member is disposed between one end of the cylindrical wall and the first through hole of the cooling fan side cover member.
In a preferred aspect, the air flow path is parallel to the drive shaft, and the communication space is perpendicular to the air flow path.
A preferred embodiment is characterized in that a heat radiating fin is formed on the inner peripheral surface of the cylindrical wall.

In a preferred aspect, the electric motor assembly includes a fan cover that covers the cooling fan, the fan cover covers the inverter case and the motor casing, and extends along the axial direction of the drive shaft. It is characterized by.
In a preferred aspect, the fan cover includes a cylinder part that covers at least a part of the motor casing, and a fan case part integrally formed with the cylinder part.
In a preferred aspect, the fan cover includes a fan frame that covers at least a part of the motor casing, and a fan housing that is configured separately from the fan frame.

Since the fan cover side rectification protrusion and the inverter case side rectification protrusion are arranged in a straight line, the cooling fan can generate air flowing linearly by its rotation. Therefore, the air for cooling the motor and the inverter can cool the inverter case and the motor casing without impairing the flow velocity. As a result, the inverter and the motor are efficiently cooled.

Since the motor assembly includes a cylindrical wall that forms an air flow path and a spacer that forms a communication space, the space in which the inverter is disposed can be actively cooled. Therefore, the motor assembly can effectively reduce the temperature of the inverter through the cooling of this space.

It is a perspective view showing one embodiment of an electric motor assembly. It is sectional drawing which shows one Embodiment of an electric motor assembly. It is a figure which shows a mode that the heat of a motor and the heat of an inverter are discharge | released to the exterior of an electric motor assembly through a bracket. It is a side view of the electric motor assembly shown in FIG. It is the figure seen from the A line direction of FIG. It is the figure seen from the B line direction of FIG. It is a side view of a fan cover. It is the figure seen from the C line direction of FIG. It is the figure seen from the D line direction of FIG. It is a figure which shows the fan cover side rectification protrusion and the inverter case side rectification protrusion arrange | positioned so that it may mutually align on a straight line. It is a figure which shows one Embodiment of a positioning structure. It is a figure which shows other embodiment of the positioning structure. It is a figure which shows other embodiment of the positioning structure. It is sectional drawing which shows other embodiment of an electric motor assembly. It is sectional drawing which shows other embodiment of an electric motor assembly. It is sectional drawing which shows other embodiment of an electric motor assembly. It is a figure which shows the connection structure to the flow path of an air, and a cylindrical wall to the inverter case. It is a figure which shows the cooling fan side cover member and cylindrical wall which were comprised integrally. It is a figure which shows the motor casing side cover member and cylindrical wall which were comprised integrally. It is the sectional view on the AA line of FIG. It is a perspective view of a part of an electric motor assembly. It is a figure which shows the flow of the air sent by rotation of a cooling fan. It is a perspective view which shows other embodiment of a spacer. It is sectional drawing which shows other embodiment of an electric motor assembly. It is a figure for demonstrating the effect of the fan cover which concerns on embodiment shown in FIG. It is sectional drawing which shows other embodiment of an electric motor assembly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a perspective view showing an embodiment of an electric motor assembly 1. FIG. 2 is a cross-sectional view showing an embodiment of the electric motor assembly 1. The electric motor assembly 1 is a mechanical device having an integrated structure in which an inverter 20 is built. As shown in FIGS. 1 and 2, the electric motor assembly 1 includes a motor unit 2 and an inverter unit 3. The electric motor assembly 1 houses a drive shaft 5, a motor (rotating element) 8 including a rotor (rotor) 6 and a stator (stator) 7 that rotate the drive shaft 5, and the rotor 6 and the stator 7. An inverter 20 disposed adjacent to the motor casing 10, the rotor 6 and the stator 7, controls the operation (rotation speed) of the motor 8, and accommodates the inverter 20, along the axis CL direction of the drive shaft 5. An inverter case 21 arranged in series with the motor casing 10 is provided.

The drive shaft 5 extends through the motor casing 10 and the inverter case 21, and the motor casing 10 and the inverter case 21 are arranged concentrically with the drive shaft 5. In the present embodiment, since the motor casing 10 and the inverter case 21 are arranged in series in the direction of the axis CL of the drive shaft 5, the electric motor assembly 1 can have a compact structure. A cooling fan 25 arranged concentrically with the drive shaft 5 is fixed to an end portion of the drive shaft 5 (that is, on the opposite side of the drive shaft 5). The cooling fan 25 is disposed outside the inverter case 21 and is adjacent to the inverter case 21. In one embodiment, the cooling fan 25 is a centrifugal fan.

Inside the motor casing 10, a motor 8 as a heat source is arranged. The motor 8 includes a rotor 6 fixed to the drive shaft 5 and a stator (stator) that surrounds the rotor 6 and receives a power from the outside (not shown) by a winding (coil) 7b to form a rotating magnetic field. 7). The stator 7 includes a stator core 7a and a plurality of windings 7b wound around the stator core 7a. The rotor 6 is rotated by a rotating magnetic field formed between the rotor 6 and the stator 7, and the drive shaft 5 to which the rotor 6 is fixed rotates together with the rotor 6.

In FIG. 2, the motor 8 is schematically drawn. The motor 8 is, for example, a permanent magnet type motor using a permanent magnet for the rotor. However, the motor 8 is not limited to a permanent magnet motor, and may be various types of motors such as an induction motor and an SR motor.

The motor casing 10 includes a motor frame 11 to which the stator 7 is fixed, an end cover 12 in which one opening end of the motor frame 11 is closed and a through hole 30 through which the drive shaft 5 passes is formed. And the bracket 13 in which a through hole 31 through which the drive shaft 5 passes is formed. The end cover 12 and the bracket 13 are opposed to each other with the motor 8 interposed therebetween. The drive shaft 5 is rotatably supported by a bearing 27 supported by the bearing support portion 32 of the end cover 12 and a bearing 28 supported by the bearing support portion 33 of the bracket 13.

The inverter case 21 includes an inverter frame 22 that surrounds the inverter 20, in other words, is disposed around the inverter 20, and a cover member 23 that closes the open end of the inverter frame 22. The inverter frame 22 is disposed adjacent to the bracket 13 and is connected to the bracket 13.

The electric motor assembly 1 includes an inverter case 21, more specifically, a fan cover 51 connected to the cover member 23 so as to cover the cooling fan 25. The fan cover 51 is a member for sending cooling air to the inverter unit 3 and the motor unit 2 in this order while preventing a human finger from contacting the cooling fan 25. The fan cover 51 is disposed so as to cover the cover member 23, and is fixed to the cover member 23. The fan cover 51 has an opening 51 a formed on the surface of the fan cover 51 that faces the cooling fan 25.

A plurality of fins 36 are formed on the outer surface of the cover member 23. These fins 36 are adjacent to the cooling fan 25 and extend from the outer surface of the cover member 23 toward the cooling fan 25. The cover member 23 is disposed concentrically with the drive shaft 5, and a through hole 40 through which the drive shaft 5 passes is formed in the center of the cover member 23. The drive shaft 5 extends to the outside of the cover member 23 through the through hole 40.

The inverter 20 is disposed inside the inverter case 21. The inverter 20 includes an inverter element 41 including elements such as a switching element and a capacitor, and a substrate 42 on which the inverter element 41 is mounted. The substrate 42 is fixed to the inner surface of the cover member 23 via a spacer 43. The inner surface of the cover member 23 is a surface opposite to the outer surface of the cover member 23 on which the fins 36 are formed. The cover member 23 has a tray shape on which the substrate 42 is placed. With such a structure, the cover member 23 can be filled with resin for heat dissipation and surface protection of the substrate 42.

The electric motor assembly 1 further includes a shaft cover 50 that covers the periphery of the drive shaft 5. The shaft cover 50 is a separating member that separates the drive shaft 5 and the inverter 20. The shaft cover 50 has a cylindrical shape and is disposed concentrically with the drive shaft 5. The shape of the shaft cover 50 is not particularly limited. The shaft cover 50 extends in the direction of the axis line CL of the drive shaft 5. The inverter 20 (that is, the inverter element 41 and the substrate 42) and the connection line that electrically connects the inverter 20 and the winding 7b of the stator 7 are disposed outside the shaft cover 50.

The substrate 42 has an annular shape through which the drive shaft 5 and the shaft cover 50 penetrate, and the substrate 42 and the shaft cover 50 are arranged concentrically with the drive shaft 5. By providing the shaft cover 50, it is possible to prevent the connection line from being wound around the drive shaft 5 and the contact of the inverter element 41 with the drive shaft 5. As a result, failure of the inverter 20 can be reliably prevented.

In this embodiment, the motor frame 11 and the inverter frame 22 are composed of separate members, and a bracket 13 is interposed between the motor frame 11 and the inverter frame 22. The motor frame 11 and the bracket 13 are connected to each other, and the inverter frame 22 and the bracket 13 are connected to each other. Thus, since the motor frame 11, the bracket 13, and the inverter frame 22 are comprised from another member and the motor frame 11 and the inverter frame 22 are connected via the bracket 13, the operator can remove the bracket 13 from the bracket 13. It can be removed from the motor frame 11. Therefore, the operator can easily replace the bearing 28 without pulling out the rotor 6. That is, with such a structure, the maintainability of the electric motor assembly 1 can be improved.

Since the motor frame 11, the bracket 13, and the inverter frame 22 are made of different members, a material suitable for the purpose can be applied to the motor frame 11, the bracket 13, and the inverter frame 22. Each of the motor 8 and the inverter 20 is a heat source. Therefore, for example, when considering the heat dissipation of the motor 8 and the inverter 20, it is preferable to apply aluminum (Al) having high thermal conductivity as the material of the motor frame 11 and the material of the inverter frame 22. However, in order to avoid insufficient strength of the motor frame 11 and the inverter frame 22, the thickness of the motor frame 11 and the thickness of the inverter frame 22 are likely to increase. As a result, the accommodation space for the motor 8 and the inverter 20 may be reduced.

On the other hand, when the material of the motor frame 11 and the material of the inverter frame 22 are iron materials, the thickness of the motor frame 11 and the inverter are compared with the case where the material of the motor frame 11 and the material of the inverter frame 22 are aluminum materials. The thickness of the frame 22 can be reduced. However, since iron has a lower thermal conductivity than aluminum, there is a risk that the heat dissipation of the heat source is inferior. Therefore, the material of the bracket 13 is used in order to secure the heat dissipation of the heat source by using the iron frame as the material for the motor frame 11 that requires the accommodation space for the motor 8 and the material for the inverter frame 22 that requires the accommodation space for the inverter 20. Is preferably an aluminum material having a high thermal conductivity.

FIG. 3 is a diagram showing how the heat of the motor 8 and the heat of the inverter 20 are released to the outside of the electric motor assembly 1 through the bracket 13. 3 indicate the heat flow of the motor 8 and the inverter 20 through the bracket 13. In FIG. 3, the heat flow of the motor 8 through the motor frame 11 and the heat flow of the inverter 20 through the inverter frame 22 are not shown. In this embodiment, since the material of the motor frame 11, the material of the inverter frame 22, and the material of the bracket 13 can be arbitrarily changed, the accommodation space for the motor 8 and the accommodation space for the inverter 20 can be secured. And the heat dissipation of the motor 8 and the inverter 20 can be ensured.

As described in Patent Document 1 (Japanese Patent Laid-Open No. 2016-201998), a configuration in which a cooling fan attached to the tip of a drive shaft is covered with a fan cover is known. According to such a configuration, since the air flow is formed by the rotation of the cooling fan, the heat generation source is indirectly cooled through the housing member. However, in the configuration in which the fan cover is simply provided, turbulent air flow is formed in the space between the inner surface of the fan cover and the outer surface of the housing member, and the air flowing by the rotation of the cooling fan is likely to diffuse. Become. As a result, the cooling performance of the heat source decreases with a loss of the air flow rate (ie, wind speed). Therefore, in the present embodiment, the electric motor assembly 1 can send the air flowing by the rotation of the cooling fan 25 to the inverter case 21 and the motor casing 10 more effectively, that is, without reducing the air flow rate. It has a possible structure.

FIG. 4 is a side view of the electric motor assembly 1 shown in FIG. FIG. 5 is a view as seen from the direction of line A in FIG. 6 is a view as seen from the direction of line B in FIG. FIG. 7 is a side view of the fan cover 51. FIG. 8 is a view as seen from the direction C in FIG. FIG. 9 is a view as seen from the direction of line D in FIG.

The fan cover 51 includes a cylindrical portion 52 to which the cover member 23 is fixed, and a tapered portion (that is, a fan case portion) 53 connected to the cylindrical portion 52. In the present embodiment, the cylindrical portion 52 and the tapered portion 53 are integrally formed members that are integrally formed. The cover member 23 has a protrusion 24 that extends outward from the outer surface thereof (see FIGS. 1, 2, 3, and 6). One end of the cylindrical portion 52 is fixed to the protruding portion 24 of the cover member 23. One end of the cylindrical portion 52 is a portion of the cylindrical portion 52 on the inverter case 21 side. When the tube portion 52 is fixed to the cover member 23, a gap is formed between the inner surface 52 a of the tube portion 52 and the outer surface of the cover member 23. The tapered portion 53 is connected to the other end portion of the cylindrical portion 52. The other end portion of the cylindrical portion 52 is a portion opposite to the one end portion of the cylindrical portion 52. The tapered portion 53 has a shape that gradually decreases in diameter as it moves away from the cylindrical portion 52. An opening 51 a is formed on the end surface of the tapered portion 53. In one embodiment, the tapered portion 53 may not have a tapered shape.

The openings 51a of the fan cover 51 are a plurality of holes arranged in alignment, and each of the plurality of holes has a size such that a human finger does not contact the cooling fan 25 (FIG. 5). , FIG. 8 and FIG. 9). The shape of the opening 51a of the fan cover 51 is not limited to this embodiment. The cooling fan 25 is disposed inside the tapered portion 53 of the fan cover 51 and is adjacent to the opening 51 a of the fan cover 51. That is, the cooling fan 25 is disposed on the upstream side of the cylindrical portion 52 in the flow direction of the air flowing by the rotation. When the cooling fan 25 rotates, the air around the opening 51 a of the fan cover 51 passes through the opening 51 a and is sucked into the fan cover 51.

As shown in FIG. 9, the electric motor assembly 1 includes a first fan cover side rectifying protrusion 55 and a second rectifying protrusion 55 that extend inward from the inner surface 52 a of the cylindrical portion 52 of the fan cover 51, that is, toward the cover member 23. The fan cover side rectifying protrusion 55 is provided. In the embodiment shown in FIG. 9, a plurality of fan cover side rectifying protrusions 55 including a first fan cover side rectifying protrusion 55 and a second fan cover side rectifying protrusion 55 are provided on the inner surface 52 a of the cylindrical portion 52. Yes. More specifically, the first fan cover side rectifying protrusion 55 to the 40th fan cover side rectifying protrusion 55 are provided. The number of fan cover side rectification protrusions 55 is not limited to this embodiment. The number of fan cover side rectification protrusions 55 may be an even number or an odd number.

As shown in FIG. 9, the plurality of fan cover side rectifying protrusions 55 are arranged at equal intervals along the circumferential direction of the inner surface 52 a of the cylindrical portion 52, and toward the radially inner side of the inner surface 52 a of the cylindrical portion 52. It extends. The plurality of fan cover side rectifying protrusions 55 also extend in the direction of the axis CL of the drive shaft 5. In one embodiment, although not illustrated, the plurality of fan cover side rectifying protrusions 55 may be arranged at unequal intervals along the circumferential direction of the inner surface 52 a of the cylindrical portion 52.

In order to stably fix the fan cover 51 to the protruding portion 24 of the cover member 23, the connecting portion 52b of the cylindrical portion 52 with the cover member 23 has a planar shape. With such a shape, the connection part 52 b can be in close contact with the end surface of the protrusion 24 of the cover member 23, and as a result, the fan cover 51 is stably fixed to the cover member 23. The fan cover side rectification protrusion 55 located at the connection part 52b extends perpendicularly to the connection part 52b.

As shown in FIGS. 1, 2, 3, and 4, the electric motor assembly 1 includes a first extending from the outer surface of the inverter case 21, more specifically, from the outer surface 22 a of the inverter frame 22. An inverter case side rectifying protrusion 56 and a second inverter case side rectifying protrusion 56 are provided. In the present embodiment, the outer surface 22 a of the inverter frame 22 is provided with a plurality of inverter case side rectification protrusions 56 including a first inverter case side rectification protrusion 56 and a second inverter case side rectification protrusion 56. Each of the plurality of inverter case side rectification protrusions 56 extends over the entire inverter frame 22. The number of inverter case side rectification protrusions 56 is not limited to this embodiment. The number of the inverter case side rectification protrusions 56 may be an even number or an odd number.

The plurality of inverter case side rectification protrusions 56 are arranged at equal intervals along the circumferential direction of the outer surface 22a of the inverter frame 22 and extend outward in the radial direction of the outer surface 22a of the inverter frame 22. The plurality of inverter case side rectification protrusions 56 also extend in the direction of the axis CL of the drive shaft 5. In one embodiment, although not illustrated, the plurality of inverter case side rectification protrusions 56 may be arranged at unequal intervals along the circumferential direction of the outer surface 22 a of the inverter frame 22.

The first fan cover side rectification protrusion 55 and the first inverter case side rectification protrusion 56 are arranged so as to be aligned, and the second fan cover side rectification protrusion 55 and the second inverter case side rectification protrusion 56 are arranged. Are arranged in a straight line. In one embodiment, the number of fan cover side rectifying protrusions 55 and the number of inverter case side rectifying protrusions 56 are the same, and the interval between the adjacent fan cover side rectifying protrusions 55 is the inverter case side rectifying protrusions 56 adjacent to each other. Is the same as the interval between Each of the plurality of fan cover side rectifying protrusions 55 is aligned with each of the plurality of inverter case side rectifying protrusions 56. Preferably, the vertical cross-sectional shape of the fan cover-side rectifying protrusion 55 is the same as the vertical cross-sectional shape of the inverter case-side rectifying protrusion 56.

FIG. 10 is a view showing the fan cover side rectification protrusion 55 and the inverter case side rectification protrusion 56 arranged so as to be aligned with each other. In FIG. 10, two fan cover side rectification protrusions 55 adjacent to each other and two inverter case side rectification protrusions 56 adjacent to each other are drawn, and other than the fan cover side rectification protrusion 55 and the inverter case side rectification protrusion 56. Illustration of elements is omitted.

When the fan cover 51 is attached to the inverter case 21, the end face 55a of the first fan cover side rectifying protrusion 55 is adjacent to (in contact with) the end face 56a of the first inverter case side rectifying protrusion 56, and the second fan cover The end face 55 a of the side rectifying protrusion 55 is adjacent to (in contact with) the end face 56 a of the second inverter case side rectifying protrusion 56. The end surface 55 a of the fan cover side rectifying protrusion 55 is a surface adjacent to the inverter case side rectifying protrusion 56, and the end surface 56 a of the inverter case side rectifying protrusion 56 is a surface adjacent to the fan cover side rectifying protrusion 55.

As shown in FIG. 10, the distance D1 between the fan cover side rectification protrusions 55 adjacent to each other is the same as the distance D2 between the inverter case side rectification protrusions 56 adjacent to each other. Thus, since the distance D1 and the distance D2 are the same, when the fan cover 51 is attached to the cover member 23, the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56 are aligned in a straight line. it can. When the cooling fan 25 rotates in this state, the air linearly flows through the flow path between the fan cover side rectification protrusions 55 adjacent to each other and the flow path between the inverter case side rectification protrusions 56 adjacent to each other. That is, the air can flow toward the inverter case 21 and the motor casing 10 in a rectified state without disturbing the flow (see arrows in FIG. 10).

In the present embodiment, the cooling fan 25 is surrounded by the tapered portion 53 of the fan cover 51, and the fan cover side rectifying protrusion 55 is fixed to the inner surface 52 a of the cylindrical portion 52 connected to the tapered portion 53. Therefore, the fan cover side rectification protrusion 55 is disposed immediately downstream of the cooling fan 25 in the air flow direction. The air that has flowed into the fan cover 51 collides with the inner surface of the tapered portion 53 by the rotation of the cooling fan 25, and the air flow direction is changed along the inner surface 52 a of the cylindrical portion 52. Since the fan cover side rectification protrusion 55 is disposed immediately downstream of the cooling fan 25, the flow direction of the converted air is immediately determined by the fan cover side rectification protrusion 55. Since the fan cover side rectifying protrusion 55 divides the space between the inner surface 52a of the cylindrical portion 52 and the outer surface of the cover member 23 into a plurality of spaces, a plurality of small spaces separated by the fan cover side rectifying protrusion 55 are provided. The air passing through does not diffuse.

The air whose flow direction is determined in this way is not diffused, and the flow path between the first fan cover side rectifying protrusion 55 and the second fan cover side rectifying protrusion 55 and the first inverter case side are not diffused. It flows through the flow path between the rectifying protrusion 56 and the second inverter case side rectifying protrusion 56. In this way, the first fan cover side rectifying protrusion 55 and the second fan cover side rectifying protrusion 55 can determine the direction in which the air flows, so that the air can be prevented from diffusing and flowing. It is possible to suppress the loss of air flow velocity (that is, wind speed). As a result, the cooling fan 25 can improve its cooling performance.

As described above, when the vertical cross-sectional shape of the fan cover side rectifying protrusion 55 is the same as the vertical cross sectional shape of the inverter case side rectifying protrusion 56, the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56 are The air by rotation of 25 can be flowed more smoothly.

The height of the fan cover side rectifying protrusion 55 (that is, the distance from the end of the fan cover side rectifying protrusion 55 to the tip of the fan cover side rectifying protrusion 55) is not particularly limited, and the strength of the air flow, the fan cover 51 May be adjusted according to factors such as the shape of the cover member 23 and / or the shape of the cover member 23. The same applies to the rectifying protrusion 56 on the inverter case side.

According to the present embodiment, since the fan cover side rectifying protrusion 55 and the inverter case side rectifying protrusion 56 are arranged so as to be aligned, even if the motor frame 11 and the inverter frame 22 are separate members, the cooling is performed. The fan 25 can generate air that flows linearly by its rotation. The air whose flow direction is determined can flow smoothly to the rear end of the motor casing 10, that is, the end cover 12 without impairing the flow velocity. The air for cooling the inverter 20 and the motor 8 can contact the outer surface 22 a of the inverter frame 22 and the outer surface 11 a of the motor frame 11, and can take away the heat generated from the inverter 20 and the heat generated from the motor 8. In this way, the air flowing along the fan cover side rectification protrusion 55 and the inverter case side rectification protrusion 56 can cool the inverter case 21 and the motor casing 10, so that the motor 8 and the inverter 20 are efficiently cooled. The

The fan cover 51 covers the entire cover member 23 without covering the inverter frame 22. Therefore, even if the inverter frame 22 is heated by the heat of the inverter 20, the outer surface 22 a of the inverter frame 22 is in contact with the external space, so that the air sent by the rotation of the cooling fan 25 effectively heats the inverter frame 22. Can be taken away. This air can flow smoothly to the rear end portion of the motor casing 10 without becoming high temperature due to the heat of the inverter 20. When air becomes high temperature by the heat of the inverter 20, it is necessary to increase the size of the cooling fan 25 or increase the rotation speed of the cooling fan 25 in order to effectively cool the motor casing 10. According to the present embodiment, the fan cover side rectification protrusion 55 and the inverter case side rectification protrusion 56 reduce the flow rate of air while suppressing the loss of air flow velocity, that is, in the direction of the axis CL of the drive shaft 5. Since the electric motor assembly 1 can be formed, it is not necessary to cover the inverter frame 22 with the fan cover 51. Therefore, it is not necessary to increase the size of the cooling fan 25 and it is not necessary to increase the rotation speed of the cooling fan 25.

In one embodiment, the inverter case side rectification protrusion 56 may have not only a function for rectifying air but also a function as a heat radiation fin for radiating heat from the inverter 20. In this case, the inverter case side rectification protrusion 56 is preferably made of a material having high thermal conductivity. In another embodiment, a single radiating fin or a plurality of radiating fins different from the inverter case side rectifying protrusion 56 are provided between the first inverter case side rectifying protrusion 56 and the second inverter case side rectifying protrusion 56. You may arrange. The radiating fins extend outward from the outer surface 22a of the inverter frame 22, and are also referred to as inverter case side radiating fins.

The electric motor assembly 1 may further include a motor casing-side rectifying protrusion 57 extending outward from the outer surface of the motor casing 10, more specifically, from the outer surface 11 a of the motor frame 11. In the present embodiment, the electric motor assembly 1 includes a plurality of motor casing side rectification protrusions 57 including a first motor casing side rectification protrusion 57 and a second motor casing side rectification protrusion 57. In this case, the first motor casing side rectification protrusion 57 is arranged so as to be aligned with the first fan cover side rectification protrusion 55 and the first inverter case side rectification protrusion 56, and the second motor casing. The side rectification protrusion 57 is arranged so as to be aligned with the second fan cover side rectification protrusion 55 and the second inverter case side rectification protrusion 56.

The distance between the first motor casing side rectification protrusion 57 and the second motor casing side rectification protrusion 57 is the distance between the first fan cover side rectification protrusion 55 and the second fan cover side rectification protrusion 55. It is the same as D1 (see FIG. 10) and the distance D2 (see FIG. 10) between the first inverter case side rectification protrusion 56 and the second inverter case side rectification protrusion 56.

In one embodiment, the electric motor assembly 1 may include a single motor casing side rectifying protrusion 57. In this case, the motor casing side rectification protrusion 57 is aligned with the first fan cover side rectification protrusion 55 and the first inverter case side rectification protrusion 56, or the second fan cover side rectification protrusion 55 and the first The two inverter case-side rectifying protrusions 56 are arranged in a straight line.

Hereinafter, a case where the electric motor assembly 1 includes a plurality of motor casing side rectifying protrusions 57 will be described. Since the configuration of the motor casing side rectification projection 57 not specifically described is the same as the configuration of the fan cover side rectification projection 55 and the configuration of the inverter case side rectification projection 56, the redundant description thereof is omitted.

Each of the plurality of motor casing side rectifying protrusions 57 extends over the entire motor frame 11. The number of motor casing side rectification protrusions 57 is not limited to this embodiment. The number of motor casing side rectification protrusions 57 may be an even number or an odd number. The plurality of motor casing side rectification protrusions 57 are arranged at equal intervals along the circumferential direction of the outer surface 11 a of the motor frame 11, and extend outward in the radial direction of the outer surface 11 a of the motor frame 11. The plurality of motor casing side rectifying protrusions 57 also extend in the direction of the axis CL of the drive shaft 5. In one embodiment, although not illustrated, the plurality of motor casing side rectification protrusions 57 may be arranged at unequal intervals along the circumferential direction of the outer surface 11 a of the motor frame 11.

The number of motor casing side rectification protrusions 57 may be the same as or different from the number of fan cover side rectification protrusions 55 and the number of inverter case side rectification protrusions 56. By providing the motor casing side rectification protrusion 57, the air for cooling the inverter 20 and the motor 8 can flow to the end cover 12 more reliably while being rectified. Therefore, the cooling fan 25 can cool the inverter 20 and the motor 8 more efficiently via the inverter case 21 and the motor casing 10.

In one embodiment, the motor casing side rectification protrusion 57 may have not only a function for rectifying air but also a function as a radiating fin for radiating the motor 8. In this case, it is preferable that the motor casing side rectification protrusion 57 is made of a material having high thermal conductivity. In another embodiment, the electric motor assembly 1 may further include a motor casing-side heat radiation fin that extends outward from the outer surface 11 a of the motor frame 11. When the first motor casing side rectification protrusion 57 and the second motor casing side rectification protrusion 57 are provided, a single gap is provided between the first motor casing side rectification protrusion 57 and the second motor casing side rectification protrusion 57. A heat radiating fin or a plurality of heat radiating fins may be arranged.

The inverter frame 22 and the motor frame 11 are connected via the bracket 13 so that the inverter case side rectification protrusion 56 and the motor casing side rectification protrusion 57 are arranged in a straight line. The electric motor assembly 1 includes a positioning structure 60 that determines a relative position between the motor casing 10 and the inverter case 21 so that the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 are aligned. Hereinafter, the positioning structure 60 will be described.

FIG. 11 is a view showing an embodiment of the positioning structure 60. As shown in FIG. 11, the positioning structure 60 includes a first vertical positioning hole 61 formed in the motor frame 11 and the bracket 13 and extending in a direction perpendicular to the direction of the axis CL of the drive shaft 5, the inverter frame 22 and the bracket. 13 and is inserted into a first vertical positioning hole 61 and a second vertical positioning hole 62 extending in a direction perpendicular to the direction of the axis CL of the drive shaft 5 to determine the relative position between the motor frame 11 and the bracket 13. The inverter frame 22 and the bracket 13 are inserted into the first positioning tool 63 for fastening the motor frame 11 and the bracket 13 and the second vertical positioning hole 62 and the relative position between the inverter frame 22 and the bracket 13 is determined. The second positioning tool 64 is fastened.

In the present embodiment, a single first vertical positioning hole 61, a single second vertical positioning hole 62, a single first positioning tool 63, and a single second positioning tool 64 are depicted. A plurality of first vertical positioning holes 61, a plurality of second vertical positioning holes 62, a plurality of first positioning tools 63, and a plurality of second positioning tools 64 are provided.

The plurality of first vertical positioning holes 61 are arranged at equal intervals along the circumferential direction of the motor frame 11 (and the bracket 13), and the plurality of second vertical positioning holes 62 are formed on the inverter frame 22 (and the bracket 13). They are arranged at equal intervals along the circumferential direction. The number of first positioning tools 63 corresponds to the number of first vertical positioning holes 61, and the number of second positioning tools 64 corresponds to the number of second vertical positioning holes 62.

The outer surface 13a of the bracket 13 is formed with an annular convex portion 15 extending outward from the outer surface 13a of the bracket 13. The annular projection 15 of the bracket 13 is sandwiched between the motor frame 11 and the inverter frame 22.

The first vertical positioning hole 61 includes a through hole 61 a formed in the motor frame 11 and a screw hole 61 b formed in the bracket 13. The through hole 61 a is formed at the end of the motor frame 11 on the bracket 13 side. The screw hole 61b is formed in the outer surface 13a of the bracket 13 on the motor frame 11 side.

The second vertical positioning hole 62 includes a through hole 62 a formed in the inverter frame 22 and a screw hole 62 b formed in the bracket 13. The through hole 62 a is formed at the end of the inverter frame 22 on the bracket 13 side. The screw hole 62b is formed in the outer surface 13a of the bracket 13 on the motor frame 11 side. The screw holes 61 b and 62 b are located on both sides of the annular convex portion 15.

By inserting the first positioning tool 63 into the through hole 61a and the screw hole 61b in a state where the through hole 61a and the screw hole 61b are associated with each other, the relative position between the motor frame 11 and the bracket 13 is determined, and the motor The frame 11 and the bracket 13 are fastened to each other by the first positioning tool 63. As an example of the first positioning tool 63, a fixing pin or a screw (for example, a set screw) can be cited. The first positioning tool 63 may be referred to as a first fastener.

Similarly, the relative position between the inverter frame 22 and the bracket 13 is determined by inserting the second positioning tool 64 into the through hole 62a and the screw hole 62b in a state where the through hole 62a and the screw hole 62b are associated with each other. The inverter frame 22 and the bracket 13 are fastened to each other by the second positioning tool 64. As an example of the second positioning tool 64, a fixing pin or a screw (for example, a set screw) can be cited. The second positioning tool 64 may be called a second fastener.

When the first positioning tool 63 is inserted into the first vertical positioning hole 61 and the second positioning tool 64 is inserted into the second vertical positioning hole 62, the inverter case side rectification protrusion 56 and the motor casing side rectification protrusion 57 are in a straight line. Arranged side by side. According to this embodiment, since the positioning structure 60 has a simple structure, the assemblability of the electric motor assembly 1 can be improved. The operator can assemble the electric motor assembly 1 so that the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 are aligned in a straight line by executing a simple assembling method using the positioning structure 60. .

FIG. 12 is a view showing another embodiment of the positioning structure 60. As shown in FIG. 12, the positioning structure 60 is formed in the motor frame 11 and the bracket 13, formed in the first parallel positioning hole 70 extending in parallel with the axis CL direction of the drive shaft 5, and the cover member 23, and driven A second parallel positioning hole 71 extending in parallel with the axis CL direction of the shaft 5 is provided. The positioning structure 60 is inserted into the first parallel positioning hole 70 and the second parallel positioning hole 71 in a state where the bracket 13 and the inverter frame 22 are sandwiched between the cover member 23 and the motor frame 11, and the motor casing 10 and the inverter case 21 are inserted. And a through bolt 72 for fastening the two.

In FIG. 12, a single first parallel positioning hole 70 and a single second parallel positioning hole 71 are depicted, but a plurality of first parallel positioning holes 70 and a plurality of second parallel positioning holes 71 are provided. ing. The plurality of first parallel positioning holes 70 are arranged at equal intervals along the circumferential direction of the motor frame 11 (and the bracket 13), and the plurality of second parallel positioning holes 71 are arranged in the circumferential direction of the cover member 23. It is arranged at equal intervals along. The number of through bolts 72 corresponds to the number of first parallel positioning holes 70 or the number of second parallel positioning holes 71.

As shown in FIG. 12, the first parallel positioning hole 70 includes a screw hole 70 a formed at the end of the motor frame 11 on the bracket 13 side and a through hole 70 b formed in the annular convex portion 15 of the bracket 13. I have. The second parallel positioning hole 71 is a through hole formed in the outer peripheral end of the cover member 23. In the present embodiment, the screw hole 70a and the through hole 70b are made to correspond to each other, and the screw hole 70a and the through hole 70b (that is, the first parallel positioning hole 70) and the second parallel positioning hole 71 are made to correspond to each other. By inserting the through bolt 72 into the first parallel positioning hole 70 and the second parallel positioning hole 71, the relative positions of the cover member 23, the inverter frame 22, the bracket 13, and the motor frame 11 are determined. Further, the through bolt 72 can fasten the cover member 23, the inverter frame 22, the bracket 13, and the motor frame 11 by pressing the cover member 23 against the inverter frame 22 at its head.

When the through bolt 72 is inserted into the first parallel positioning hole 70 and the second parallel positioning hole 71, the inverter case side rectifying protrusion 56 and the motor casing side rectifying protrusion 57 are arranged in a straight line. Also according to this embodiment, since the positioning structure 60 has a simple structure, the assemblability of the electric motor assembly 1 can be improved. The operator arranges the inverter case side rectification protrusion 56 and the motor casing side rectification protrusion 57 in a straight line by a simple method of inserting the bolts 72 through the first parallel positioning hole 70 and the second parallel positioning hole 71. Thus, the electric motor assembly 1 can be assembled.

The cover member 23 to which the heat of the inverter 20 is transmitted and the motor frame 11 to which the heat of the motor 8 is transmitted are connected to each other via a through bolt 72. In one embodiment, the through bolt 72 may be made of a material having high thermal conductivity. With such a configuration, the through bolt 72 can transfer the heat of the high temperature side member (ie, the inverter frame 22 or the motor frame 11) to the low temperature side member (ie, the inverter frame 22 or the motor frame 11). Therefore, the through bolt 72 can make the temperature of the motor frame 11 and the temperature of the inverter frame 22 uniform.

Since the through bolt 72 is disposed outside the inverter frame 22 and exposed to the external space, the cooling fan 25 can directly contact the through bolt 72 with the air sent by its rotation. Therefore, the cooling fan 25 can cool the inverter frame 22 and the motor frame 11 via the through bolts 72. That is, the through bolt 72 can fulfill the function as a heat radiating member.

In other embodiments, the through bolt 72 may be made of a material having low thermal conductivity. In this case, the through-bolt 72 indicates that the heat of the member on the high temperature side (that is, the inverter frame 22 or the motor frame 11) is transmitted to the member on the low temperature side (that is, the inverter frame 22 or the motor frame 11) through itself. Can be blocked.

FIG. 13 is a view showing still another embodiment of the positioning structure 60. As shown in FIG. 13, the positioning structure 60 is formed on the bracket 13 and extends toward the motor frame 11, and the first fitting formed on the motor frame 11 and into which the first protrusion 80 is fitted. A groove 81, a second protrusion 82 formed in the bracket 13 and extending toward the inverter frame 22, and a second fitting groove 83 formed in the inverter frame 22 into which the second protrusion 82 is fitted.

As shown in FIG. 13, the first protrusion 80 and the second protrusion 82 are formed on the annular convex portion 15 of the bracket 13 and extend in parallel with the axis CL direction of the drive shaft 5. The first fitting groove 81 is formed on the end face of the motor frame 11 on the bracket 13 side, and extends parallel to the direction of the axis CL of the drive shaft 5. The second fitting groove 83 is formed on the end face of the inverter frame 22 on the bracket 13 side, and extends in parallel with the axis CL direction of the drive shaft 5.

In the embodiment shown in FIG. 13, a single first protrusion 80, a single second protrusion 82, a single first fitting groove 81, and a single second fitting groove 83 are depicted. A plurality of first protrusions 80, a plurality of second protrusions 82, a plurality of first fitting grooves 81, and a plurality of second fitting grooves 83 may be provided.

Also in the present embodiment, the first protrusion 80 of the bracket 13 is fitted into the first fitting groove 81 of the motor frame 11, and the second protrusion 82 of the bracket 13 is fitted into the second fitting groove 83 of the inverter frame 22. Inverter case side rectification protrusion 56 and motor casing side rectification protrusion 57 are arranged in a line.

The configuration of the positioning structure 60 is not limited to the above-described embodiment. The positioning structure 60 has other configurations as long as the relative positions of the inverter frame 22 and the motor frame 11 can be determined so that the inverter case side rectification protrusion 56 and the motor casing side rectification protrusion 57 are aligned. May be.

FIG. 14 is a view showing another embodiment of the electric motor assembly 1. Since the configuration of the present embodiment that is not specifically described is the same as that of the above-described embodiment, the redundant description is omitted. In the embodiment shown in FIG. 14, the fan cover 51 covers the inverter case 21 (more specifically, the inverter frame 22) and the motor casing 10 (more specifically, the motor frame 11). In the embodiment shown in FIG. 14, the fan cover 51 may be referred to as a cylindrical fan cover.

As shown in FIG. 14, the cylindrical portion 52 of the fan cover 51 extends to the motor portion 2 along the axis CL direction of the drive shaft 5. The cylindrical portion 52 may cover at least a part of the motor casing 10 (in this embodiment, the motor frame 11). In the embodiment shown in FIG. 14, the cylindrical portion 52 covers the entire inverter frame 22, and one end portion of the cylindrical portion 52 is adjacent to the end cover 12. In one embodiment, the cylindrical portion 52 may cover not only the motor frame 11 but also the end cover 12.

According to the embodiment shown in FIG. 14, the fan cover 51 can secure an air flow path to the end of the motor casing 10 (that is, the load side). It flows reliably in a straight line (see the arrow in FIG. 14). Therefore, the motor 8 and the inverter 20 are cooled more effectively.

FIG. 15 is a view showing still another embodiment of the electric motor assembly 1. Since the configuration of the present embodiment that is not specifically described is the same as that of the above-described embodiment, the redundant description is omitted. In the embodiment shown in FIG. 15, the fan cover 51 includes a fan housing 84 that is a combination of a cylindrical portion 52 and a tapered portion 53, and a fan frame 85 connected to the fan housing 84 (more specifically, the cylindrical portion 52). And.

The fan frame 85 is a cylindrical member extending in parallel with the direction of the axis CL of the drive shaft 5, and is a separate member from the fan housing 84. With such a structure, the fan housing 84 and the fan frame 85 may be made of different materials.

For example, the fan housing 84 may be made of a metal having high thermal conductivity (for example, aluminum, iron, or copper), and the fan frame 85 may be made of resin. With such a combination, the fan cover 51 can reduce the overall cost and can be reduced in weight. The combination of the material of the fan housing 84 and the material of the fan frame 85 is not limited to the embodiment described above. Arbitrary materials may be selected as materials for the fan housing 84 and the fan frame 85.

In the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. In a plurality of embodiments described below, the configuration of one embodiment that is not particularly described is the same as that of the other embodiments, and thus a duplicate description thereof is omitted.

FIG. 16 is a cross-sectional view showing still another embodiment of the electric motor assembly 201. The electric motor assembly 201 is a mechanical device having an integral structure in which an inverter 220 is built. As shown in FIG. 16, the electric motor assembly 201 includes a motor unit 202 and an inverter unit 203. The electric motor assembly 201 houses a drive shaft 205, a motor (rotating element) 208 including a rotor (rotor) 206 and a stator (stator) 207 for rotating the drive shaft 205, and the rotor 206 and the stator 207. An inverter 220 that is disposed adjacent to the motor casing 210, the rotor 206, and the stator 207, and controls the operation (rotational speed) of the motor 208, and accommodates the inverter 220, along the axis CL direction of the drive shaft 205. And an inverter case 221 arranged in series with the motor casing 210.

The drive shaft 205 extends through the motor casing 210 and the inverter case 221, and the motor casing 210 and the inverter case 221 are disposed concentrically with the drive shaft 205. In the present embodiment, since the motor casing 210 and the inverter case 221 are arranged in series in the direction of the axis CL of the drive shaft 205, the motor assembly 201 can have a compact structure. A cooling fan 225 arranged concentrically with the drive shaft 205 is fixed to an end portion of the drive shaft 205 (that is, the opposite side of the drive shaft 205). The cooling fan 225 is disposed outside the inverter case 221 and is adjacent to the inverter case 221.

Inside the motor casing 210, a motor 208 as a heat source is arranged. The motor 208 includes a rotor 206 fixed to the drive shaft 205, and a stator (stator) that surrounds the rotor 206 and receives a power from the outside (not shown) by a winding (coil) 207b to form a rotating magnetic field. 207. The stator 207 includes a stator core 207a and a plurality of windings 207b wound around the stator core 207a. The rotor 206 is rotated by a rotating magnetic field formed between the rotor 206 and the stator 207, and the drive shaft 205 to which the rotor 206 is fixed rotates together with the rotor 206.

In FIG. 16, the motor 208 is schematically drawn. The motor 208 is, for example, a permanent magnet type motor using a permanent magnet for the rotor. However, the motor 208 is not limited to a permanent magnet type motor, and may be various types of motors such as an induction motor and an SR motor.

The motor casing 210 includes a motor frame 211 to which the stator 207 is fixed, an end cover 212 in which one opening end of the motor frame 211 is closed and a through hole 230 through which the drive shaft 205 passes is formed, and the motor frame 211. And a motor side plate (inverter case side bracket) 213 in which a through hole 231 through which the drive shaft 205 passes is formed. The end cover 212 and the motor side plate 213 are opposed to each other with the motor 208 interposed therebetween. The drive shaft 205 is rotatably supported by a bearing 227 supported by the bearing support portion 232 of the end cover 212 and a bearing 228 supported by the bearing support portion 233 of the motor side plate 213.

The inverter case 221 surrounds the inverter 220, in other words, an inverter frame 222 disposed around the inverter 220, a cooling fan side cover member (cooling fan side bracket) 223 that closes one open end of the inverter frame 222, and And a motor casing side cover member (motor casing side bracket) 224 that closes the other opening end of the inverter frame 222. The cooling fan side cover member 223 is adjacent to the cooling fan 225 and has a through hole 239 through which the drive shaft 205 passes. The motor casing side cover member 224 is adjacent to the motor casing 210, more specifically, the motor side plate 213, and has a through hole 240 through which the drive shaft 205 passes. The inverter frame 222 is sandwiched between the cooling fan side cover member 223 and the motor casing side cover member 224, and is connected to both the cooling fan side cover member 223 and the motor casing side cover member 224.

The connection structure between the inverter frame 222 and the cooling fan side cover member 223 and the connection structure between the inverter frame 222 and the motor casing side cover member 224 are not particularly limited. In one embodiment, the inverter frame 222 and the cooling fan side cover member 223 may have a fitting structure. Similarly, the inverter frame 222 and the motor casing side cover member 224 may have a fitting structure.

A plurality of cooling fins 256 extending outward are formed on the outer surface of the inverter frame 222. The plurality of cooling fins 256 extend in the direction of the axis CL of the drive shaft 205. The inverter case 221 (more specifically, the inverter frame 222) is cooled by the contact of the air sent by the rotation of the cooling fan 225 with the cooling fins 256, and the inverter 220 is cooled via the inverter case 221.

A plurality of cooling fins 257 extending outward are formed on the outer surface of the motor frame 211. The plurality of cooling fins 257 extend in the direction of the axis CL of the drive shaft 205. The motor casing 210 (more specifically, the motor frame 211) is cooled by the contact of the air sent by the cooling fan 225 with the cooling fins 257, and the motor 208 is cooled via the motor casing 210.

The electric motor assembly 201 includes an inverter case 221, more specifically, a fan cover 251 connected to the cooling fan side cover member 223 so as to cover the cooling fan 225. The fan cover 251 is a member for guiding air sent by the rotation of the cooling fan 225 while preventing a human finger from contacting the cooling fan 225. The fan cover 251 is disposed so as to cover the cooling fan side cover member 223 and is fixed to the cooling fan side cover member 223. The fan cover 251 has an opening 251 a formed on the surface of the fan cover 251 facing the cooling fan 225.

The fan cover 251 includes a cylindrical portion 252 to which the cooling fan side cover member 223 is fixed, and a tapered portion (that is, a fan case portion) 253 connected to the cylindrical portion 252. In the present embodiment, the cylindrical portion 252 and the tapered portion 253 are integrally formed members that are integrally formed. One end of the cylindrical part 252 is fixed to the cooling fan side cover member 223. One end of the cylindrical part 252 is a part of the cylindrical part 252 on the inverter case 221 side. The tapered portion 253 is connected to the other end portion of the cylindrical portion 252. The other end portion of the cylindrical portion 252 is a portion on the opposite side to the one end portion of the cylindrical portion 252. The tapered portion 253 has a shape in which the diameter gradually decreases as the distance from the cylindrical portion 252 increases. An opening 251 a is formed on the end surface of the tapered portion 253. In one embodiment, the tapered portion 253 may not have a tapered shape.

A plurality of fins 236 are formed on the outer surface of the cooling fan side cover member 223. These fins 236 are adjacent to the cooling fan 225 and extend from the outer surface of the cooling fan side cover member 223 toward the cooling fan 225. The cooling fan side cover member 223 and the motor casing side cover member 224 are disposed concentrically with the drive shaft 205. The through hole 239 is formed at the center of the cooling fan side cover member 223, and the through hole 240 is formed at the center of the motor casing side cover member 224. The drive shaft 205 extends to the outside of the cooling fan side cover member 223 through these through holes 239 and 240.

An inverter 220 is disposed inside the inverter case 221. The inverter 220 includes an inverter element 241 including elements such as a switching element and a capacitor, and a substrate 242 on which the inverter element 241 is mounted. The substrate 242 is fixed to the inner surface of the cooling fan side cover member 223. The inner surface of the cooling fan side cover member 223 is a surface opposite to the outer surface of the cooling fan side cover member 223 in which the fins 236 are formed. The cooling fan side cover member 223 has a tray shape on which the substrate 242 is placed. With such a structure, the cooling fan side cover member 223 can be filled with resin for heat dissipation and surface protection of the substrate 242.

In the present embodiment, the motor casing 210 and the inverter case 221 are composed of separate members. The motor side plate 213 and the motor frame 211 are separate members, and the motor side plate 213 can be detached from the motor frame 211. Therefore, the operator can easily replace the bearing 228 without pulling out the rotor 206 from the end cover 212 side. That is, with such a structure, the maintainability of the electric motor assembly 201 can be improved.

In the present embodiment, the components of the motor casing 210 (that is, the motor frame 211, the end cover 212, and the motor side plate 213) and the components of the inverter case 221 (that is, the inverter frame 222, the cooling fan side cover member 223, and the motor) The casing side cover member 224) is composed of separate members. Therefore, a material suitable for the purpose can be applied to each of the constituent elements of the motor casing 210 and the constituent elements of the inverter case 221.

Each of the motor 208 and the inverter 220 is a heat source. Therefore, for example, when considering the heat dissipation of the motor 208 and the inverter 220, it is preferable to use aluminum (Al) having high thermal conductivity as the material of the motor frame 211 and the material of the inverter frame 222. However, in order to avoid insufficient strength of the motor frame 211 and the inverter frame 222, the thickness of the motor frame 211 and the thickness of the inverter frame 222 tend to increase. As a result, the accommodation space for the motor 208 and the inverter 220 may be reduced.

On the other hand, when the material of the motor frame 211 and the material of the inverter frame 222 are iron materials, the thickness of the motor frame 211 and the inverter are compared to the case where the material of the motor frame 211 and the material of the inverter frame 222 are aluminum materials. The thickness of the frame 222 can be reduced. However, since iron has a lower thermal conductivity than aluminum, there is a risk that the heat dissipation of the heat source is inferior. Therefore, the material of the motor frame 211 that requires the accommodation space of the motor 208 and the material of the inverter frame 222 that requires the accommodation space of the inverter 220 may be iron.

The electric motor assembly 201 further includes a cylindrical wall 250 extending in the direction of the axis CL of the drive shaft 205 so as to cover the periphery of the drive shaft 205. The cylindrical wall 250 is a member that forms a flow path 280 of air that flows by the rotation of the cooling fan 225 while isolating the drive shaft 205 and the inverter 220, and is disposed inside the inverter case 221. The cylindrical wall 250 has a cylindrical shape and is disposed concentrically with the drive shaft 205. The shape of the cylindrical wall 250 is not particularly limited. In one embodiment, the cylindrical wall 250 may have a polygonal cylindrical shape. The inverter 220 (that is, the inverter element 241 and the board 242) and a connection line (not shown) that electrically connects the inverter 220 and the winding 207b of the stator 207 are provided between the cylindrical wall 250 and the inverter case 221. It is placed in an isolation space.

The substrate 242 has an annular shape through which the drive shaft 205 and the cylindrical wall 250 penetrate, and is arranged concentrically with the drive shaft 205. By providing the cylindrical wall 250, it is possible to prevent the connection line from being wound around the drive shaft 205 and the contact of the inverter element 241 with the drive shaft 205. As a result, failure of the inverter 220 can be reliably prevented.

FIG. 17 is a diagram showing a connection structure of the air flow path 280 and the cylindrical wall 250 to the inverter case 221. The air flow path 280 is an axial hole formed inside the cylindrical wall 250 and is adjacent to the cooling fan 225. The cylindrical wall 250 includes one end portion 250a connected to the through hole 239 of the cooling fan side cover member 223, the other end portion 250b connected to the through hole 240 of the motor casing side cover member 224, one end portion 250a and others. A main body 250c connected to the end 250b and extending in the direction of the axis CL of the drive shaft 205 is provided. One end portion 250a of the cylindrical wall 250 includes an opening end surface on the cooling fan 225 side of the cylindrical wall 250 and a peripheral surface (an outer peripheral surface and an inner peripheral surface) of the cylindrical wall 250 connected to the opening end surface. It is. The other end 250b of the cylindrical wall 250 includes an opening end surface on the motor side plate 213 side of the cylindrical wall 250 and a peripheral surface (outer peripheral surface and inner peripheral surface) of the cylindrical wall 250 connected to the opening end surface. It is a part.

In the embodiment shown in FIG. 17, the cylindrical wall 250, the cooling fan side cover member 223, and the motor casing side cover member 224 are separate members. Therefore, an annular seal member 258 is disposed between the one end 250 a of the cylindrical wall 250 and the through hole 239 of the cooling fan side cover member 223. An annular seal member 259 is disposed between the other end 250 b of the cylindrical wall 250 and the through hole 240 of the motor casing side cover member 224. These seal members 258 and 259 are, for example, O-rings.

As shown in FIG. 17, the through hole 239 of the cooling fan side cover member 223 is formed with an annular groove 239a in which the seal member 258 is mounted, and the through hole 240 of the motor casing side cover member 224 is sealed with a seal. An annular groove 240a in which the member 259 is mounted is formed. The cylindrical wall 250 is connected to the cooling fan side cover member 223 and the motor casing side cover member 224 in a state where the seal members 258 and 259 are mounted in the annular grooves 239a and 240a, respectively.

The seal member 258 seals the gap between the cooling fan side cover member 223 and the cylindrical wall 250, and the seal member 259 seals the gap between the motor casing side cover member 224 and the cylindrical wall 250. Seal members 258 and 259 can prevent foreign matter such as dust or water droplets from entering the space where inverter 220 is disposed, and as a result, prevent failure of inverter 220 due to adhesion of foreign matter to inverter 220. can do.

In one embodiment, the cylindrical wall 250 is cooled so that one open end surface thereof is in close contact with the inner surface of the cooling fan side cover member 223 and the other open end surface thereof is in close contact with the inner surface of the motor casing side cover member 224. The fan side cover member 223 and the motor casing side cover member 224 may be connected. The inner surface of the motor casing side cover member 224 is a surface opposite to the outer surface of the motor casing side cover member 224 that faces the motor side plate 213. Also in this embodiment, one end portion 250 a of the cylindrical wall 250 is connected to the through hole 239 of the cooling fan side cover member 223, and the other end portion 250 b of the cylindrical wall 250 is connected to the through hole 240 of the motor casing side cover member 224. It is connected to the. The seal member 258 is disposed between one opening end surface of the cylindrical wall 250 and the inner surface of the cooling fan side cover member 223, and the seal member 259 is disposed between the other opening end surface of the cylindrical wall 250 and the motor casing side cover member 224. It is arranged between the inner surface.

Although not shown, a sealing member is disposed in each of the gap between the through hole 230 of the end cover 212 and the drive shaft 205 and the gap between the through hole 231 of the motor side plate 213 and the drive shaft 205. . Each of these sealing members can prevent foreign matter from entering the space where the motor 208 is disposed, and as a result, failure of the motor 208 due to adhesion of foreign matter to the motor 208 can be prevented. .

In one embodiment, the cylindrical wall 250 may be an integrally formed member with any one of the cooling fan side cover member 223 and the motor casing side cover member 224. FIG. 18 is a view showing the cooling fan side cover member 223 and the cylindrical wall 250 which are integrally formed. FIG. 19 is a view showing a motor casing side cover member 224 and a cylindrical wall 250 which are integrally formed.

As shown in FIG. 18, when the cooling fan side cover member 223 and the cylindrical wall 250 are integrally formed members, the seal member 258 is not provided, and the cylindrical wall 250 and the motor casing side cover member 224 are not provided. A seal member 259 is provided therebetween. As shown in FIG. 19, when the cylindrical wall 250 and the motor casing side cover member 224 are integrally formed members, the seal member 259 is not provided, and the cylindrical wall 250 and the cooling fan side cover member 223 are not provided. A seal member 258 is provided therebetween. In the embodiment shown in FIG. 18 and FIG. 19, any one of the seal members 258 and 259 is not necessary, so that the number of components of the motor assembly 201 is reduced, and the motor assembly 201 by the operator is reduced. The number of assembly processes is reduced.

As shown in FIG. 16, the motor assembly 201 includes a cooling fan side cover member 223, an inverter frame 222, a motor casing side cover member 224, a spacer 270, a motor side plate 213, a motor frame 211, and an end cover 212, which will be described later. It is assembled in the state arranged in order. In one embodiment, the motor assembly 201 may be assembled by a fastener that is a combination of through-bolts and nuts.

For example, an insertion hole into which a through bolt is inserted is formed in each of the peripheral edge of the cooling fan side cover member 223, the peripheral edge of the motor side plate 213, and the peripheral edge of the end cover 212. An operator may screw a nut into the through bolts inserted into the insertion holes and tighten the fastener in a direction in which the cooling fan side cover member 223 and the end cover 212 are close to each other.

In this way, the components of the motor assembly 201 (the cooling fan side cover member 223, the inverter frame 222, the motor casing side cover member 224, the spacer 270, the motor side plate 213, the motor frame 211, and the end cover 212) are the fasteners. When firmly tightened, the sealing property of the isolation space where the inverter 220 is arranged and the sealing property of the isolation space where the motor 208 is arranged are improved. The isolation space where the inverter 220 is arranged is a space surrounded by the cylindrical wall 250, the cooling fan side cover member 223, the motor casing side cover member 224, and the inverter frame 222. The isolation space in which the motor 208 is disposed is a space surrounded by the motor side plate 213, the motor frame 211, and the end cover 212.

As shown in FIG. 16, the electric motor assembly 201 includes a spacer 270 that is interposed between the motor casing 210 and the inverter case 221. The spacers 270 are arranged between the motor casing side cover member 224 and the motor side plate 213 and are a plurality of protruding members arranged at equal intervals along the circumferential direction of the motor side plate 213 (or the motor casing side cover member 224). 260. The plurality of projecting members 260 form an annular communication space 281 that communicates the air flow path 280 and the external space of the motor assembly 201 with the motor casing 210 (more specifically, the motor side plate 213) and the inverter case 221 ( More specifically, it is formed between the motor casing side cover member 224).

Each protruding member 260 extends in the direction of the axis CL of the drive shaft 205 and is connected to both the motor casing side cover member 224 and the motor side plate 213. The connection structure of the protrusion member 260 is not particularly limited. In one embodiment, the protrusion member 260 and at least one of the motor casing side cover member 224 and the motor side plate 213 may be connected by means such as adhesive, welding, and fitting. In another embodiment, the protruding member 260, any one of the motor casing side cover member 224 and the motor side plate 213 may be an integrally formed member.

When the operator assembles the electric motor assembly 201 in a state where the plurality of protruding members 260 are in contact with both the motor casing side cover member 224 and the motor side plate 213, each protruding member 260 includes the motor casing side cover member 224 and the motor side plate. It adheres to both of 213. As a result, a communication space 281 perpendicular to the flow path 280 extending in the direction of the axis CL of the drive shaft 205, that is, parallel to the drive shaft 205 is formed between the motor casing side cover member 224 and the motor side plate 213. The The distance between the motor casing side cover member 224 and the motor side plate 213 corresponds to the thickness of the protruding member 260 (that is, the length of the protruding member 260 in the axis CL direction).

FIG. 20 is a cross-sectional view taken along line AA in FIG. FIG. 21 is a perspective view of a part of the motor assembly 201. 20 and 21, the illustration of the cooling fins 256 is omitted. In FIG. 21, the elements of the motor unit 202 other than the motor side plate 213 are not shown, and the components of the motor assembly 201 are schematically drawn.

The plurality of protruding members 260 are arranged at equal intervals along the circumferential direction of the drive shaft 205 (or the cylindrical wall 250), in other words, the motor side plate 213 (or the motor casing side cover member 224). In the present embodiment, four protruding members 260 are provided. However, the number of the protrusion members 260 is not limited to the present embodiment as long as the communication space 281 can communicate with the external space of the electric motor assembly 201.

16 to 20, an air flow path 280 formed between the outer peripheral surface of the drive shaft 205 and the inner peripheral surface of the cylindrical wall 250 communicates with the communication space 281. The flow path 280 communicates with an external space (first external space) in which the cooling fan 225 is disposed, and the communication space 281 communicates with an external space (second external space) located on the radially outer side. Therefore, the first external space and the second external space communicate with each other via the flow path 280 and the communication space 281.

FIG. 22 is a diagram showing the flow of air sent by the rotation of the cooling fan 225. As shown in FIG. 22, when the cooling fan 225 rotates with the rotation of the drive shaft 205, the air around the opening 251a of the fan cover 251 passes through the opening 251a and is sucked into the fan cover 251. Part of the air that has flowed into the fan cover 251 collides with the inner surface of the fan cover 251, its direction is changed, and flows along the outer surface of the inverter frame 222 and the outer surface of the motor frame 211. This air contacts the outer surface of the inverter frame 222 and the cooling fins 256 to remove heat generated from the inverter 220, and further contacts the outer surface of the motor frame 211 and the cooling fins 257 to remove heat generated from the motor 208. .

The cylindrical wall 250 opens in a space (first external space) in which the cooling fan 225 is disposed and a communication space 281. Other portions of the air that has flowed into the fan cover 251 contact the fins 236 of the cooling fan side cover member 223 to indirectly cool the inverter 220, and through the opening of the cylindrical wall 250, Flows into the interior. The air in the cylindrical wall 250 flows through the flow path 280 along the axis CL direction of the drive shaft 205.

In one embodiment, the cylindrical wall 250 is preferably made of a material having high thermal conductivity. An example of a material having high thermal conductivity is copper (Cu) or aluminum. In this case, since the cylindrical wall 250 is in contact with the air in the isolation space where the inverter 220 is disposed, the heat generated from the inverter 220 is transmitted to the cylindrical wall 250, and the cylindrical wall 250 becomes high temperature. Since the air flowing through the flow path 280 in the cylindrical wall 250 can take away the heat generated from the inverter 220, the inverter 220 is indirectly cooled via the cylindrical wall 250.

In one embodiment, heat radiation fins may be formed on the inner peripheral surface of the cylindrical wall 250. The number of radiating fins may be singular or plural. The air flowing through the flow path 280 can contact the inner peripheral surface of the cylindrical wall 250 and the heat radiating fins and take away the heat generated from the inverter 220. The radiating fins may extend in the direction of the axis CL of the drive shaft 205. The radiating fin extending in the direction of the axis CL can smoothly guide the air flow in the flow path 280.

As the cooling fan 225, an axial fan or a centrifugal fan is adopted. When the cooling fan 225 is a centrifugal fan, the blades of the cooling fan 225 may have an inclined shape so that part of the air sent by the rotation of the cooling fan 225 flows into the cylindrical wall 250. Good. The cooling fan 225 may be a combination of different types of fans or a combination of the same type of fans.

Since the flow path 280 and the communication space 281 are connected to each other, the air that has passed through the flow path 280 flows into the communication space 281 and flows to the external space through the gap between the adjacent projecting members 260. The gap between the protruding members 260 constitutes a part of the communication space 281.

In this embodiment, the motor casing side cover member 224 is made of a material having high thermal conductivity. Since the motor casing side cover member 224 is in contact with the air in the isolation space where the inverter 220 is disposed, the heat of the inverter 220 is transmitted to the motor casing side cover member 224, and the motor casing side cover member 224 becomes high temperature. The air flowing into the communication space 281 contacts the motor casing side cover member 224 and flows into the external space while taking away the heat generated from the inverter 220.

The inverter case 221 includes not only the cooling fan side cover member 223 and the inverter frame 222 but also a motor casing side cover member 224. The plurality of projecting members 260 interposed between the motor casing side cover member 224 and the motor side plate 213 form a communication space 281. Therefore, the cooling fan 225 can send the surrounding air to the external space of the motor assembly 201 via the flow path 280 and the communication space 281. The air flowing by the rotation of the cooling fan 225 not only takes heat of the inverter 220 by contact with the outer surface of the cooling fan side cover member 223 and the outer surface of the inverter frame 222, but also by contact with the outer surface of the motor casing side cover member 224. Also, the heat of the inverter 220 can be taken away. According to the present embodiment, the electric motor assembly 201 includes the cylindrical wall 250 that forms the air flow path 280 and the spacer 270 that forms the communication space 281. It can be actively cooled. Therefore, the motor assembly 201 can effectively reduce the temperature of the inverter 220 through the cooling of this space. In the present embodiment, the electric motor assembly 201 can increase the contact area of the inverter case 221 with the air. Therefore, the motor assembly 201 can effectively reduce the temperature of the inverter 220.

As the material of the protruding member 260 and the material of the motor side plate 213, a material having high thermal conductivity or a material having low thermal conductivity is selected. As an example of a material having low thermal conductivity, iron, stainless steel, or resin can be given.

In one embodiment, both the protruding member 260 and the motor side plate 213 may be made of a material having high thermal conductivity. With such a configuration, the heat of the motor 208 is transmitted to the motor side plate 213, and further transmitted to the motor casing side cover member 224 via the protruding member 260. Therefore, the temperature of the motor side plate 213 and the temperature of the motor casing side cover member 224 are uniform.

The bearing 228 is supported by the bearing support portion 233 of the motor side plate 213, and frictional heat is generated in the bearing 228 by the rotation of the drive shaft 205. Therefore, when the motor side plate 213 is made of a material having high thermal conductivity, the heat of the bearing 228 is also transmitted to the motor side plate 213. The air that has passed through the flow path 280 and entered the communication space 281 contacts not only the motor casing side cover member 224 but also the motor side plate 213. Since the temperature of the motor side plate 213 and the temperature of the motor casing side cover member 224 are uniform through the protrusion member 260, the cooling fan 225 causes the motor side plate 213 and the motor casing side cover member 224 to be uniform by the air flowing through the communication space 281. Can be cooled to.

In another embodiment, the protruding member 260 is made of a material having high thermal conductivity, and the motor side plate 213 is made of a material having low thermal conductivity. In still another embodiment, both the projecting member 260 and the motor side plate 213 are made of a material having low thermal conductivity. With such a configuration, the heat of the motor 208 is not transmitted to the motor side plate 213, and as a result, the inverter 220 is not affected by the heat of the motor 208.

In still another embodiment, the protruding member 260 is made of a material having low thermal conductivity, and the motor side plate 213 is made of a material having high thermal conductivity. With such a configuration, the protruding member 260 functioning as a heat insulating material is not affected by the heat of the motor side plate 213, and the heat of the motor side plate 213 is not transmitted to the motor casing side cover member 224. Therefore, the inverter 220 is not affected by the heat of the motor 208. Since the motor side plate 213 is made of a material having high thermal conductivity, the cooling fan 225 can cool the motor side plate 213 with the air flowing through the communication space 281.

FIG. 23 is a perspective view showing another embodiment of the spacer 270. The spacer 270 is disposed between the motor casing side cover member 224 and the motor side plate 213 and includes a ring member 265 in which a communication space 281 is formed. The ring member 265 has a hollow shape and has an air hole 266 that constitutes a part of the communication space 281.

23, a through hole 267 through which the drive shaft 205 passes is formed at the center of the ring member 265, and the drive shaft 205 passes through the through hole 267. The ring member 265 is disposed perpendicular to the drive shaft 205 and is disposed concentrically with the motor casing 210, the inverter case 221, and the drive shaft 205. Since the through hole 267 of the ring member 265 is larger than the outer peripheral surface of the drive shaft 205 and is not in contact with the drive shaft 205, the ring member 265 does not rotate with the drive shaft 205.

The ring member 265 includes both end faces 265a and 265b perpendicular to the drive shaft 205, and an outer peripheral end face 265c extending between the both end faces 265a and 265b. The outer peripheral end surface 265 c extends in the direction of the axis CL of the drive shaft 205. The plurality of air holes 266 are formed in the outer peripheral end surface 265 c of the ring member 265. The number of air holes 266 is not limited to this embodiment. In one embodiment, the number of air holes 266 may be at least one. As shown in FIG. 23, the plurality of air holes 266 are arranged at equal intervals along the circumferential direction of the ring member 265. Since the air holes 266 constitute a part of the communication space 281, the air that has passed through the flow path 280 flows to the external space through the air holes 266.

FIG. 24 is a view showing still another embodiment of the electric motor assembly 201. Since the configuration of the present embodiment that is not specifically described is the same as that of the above-described embodiment, the redundant description is omitted. In the embodiment shown in FIG. 24, the fan cover 251 covers the inverter case 221 (more specifically, the inverter frame 222) and the motor casing 210 (more specifically, the motor frame 211). In the embodiment shown in FIG. 164, the fan cover 251 may be called a cylindrical fan cover.

24, the cylindrical portion 252 of the fan cover 251 extends to the motor portion 202 along the axis CL direction of the drive shaft 205. The cylindrical portion 252 may cover at least a part of the motor casing 210 (in this embodiment, the motor frame 211). In the embodiment shown in FIG. 24, the cylindrical portion 252 covers the entire inverter frame 222, and one end portion of the cylindrical portion 252 is adjacent to the end cover 212. In one embodiment, the cylindrical portion 252 may cover not only the motor frame 211 but also the end cover 212.

According to the embodiment shown in FIG. 24, the fan cover 251 can secure an air flow path to the end of the motor casing 210 (that is, the load side), and the air flowing by the rotation of the cooling fan 225 is more It surely flows linearly (see arrow A in FIG. 24). Therefore, the motor 208 and the inverter 220 are cooled more effectively.

Furthermore, according to the embodiment shown in FIG. 24, the flow path is in a negative pressure state by the air flowing linearly. The fan cover 251 can exhibit the ejector effect generated with this negative pressure. Therefore, the flow velocity of the air flowing through the communication space 281 (see arrow B in FIG. 24) increases due to the ejector effect, and as a result, the motor 208 and the inverter 220 are cooled more effectively.

FIG. 25 is a view for explaining the effect of the fan cover according to the embodiment shown in FIG. As shown in FIG. 25, the cylindrical portion 252 of the fan cover 251 is disposed around the spacer 270 and covers the spacer 270. Since the communication space 281 is surrounded by the cylindrical portion 252 of the fan cover 251, the fan cover 251 can prevent foreign matter from entering the communication space 281.

FIG. 26 is a view showing still another embodiment of the electric motor assembly 201. Since the configuration of the present embodiment that is not specifically described is the same as that of the above-described embodiment, the redundant description is omitted. In the embodiment shown in FIG. 26, the fan cover 251 includes a fan housing 284 that is a combination of a cylindrical portion 252 and a tapered portion 253, and a fan frame 285 connected to the fan housing 284 (more specifically, the cylindrical portion 252). And.

The fan frame 285 is a cylindrical member that extends in parallel with the direction of the axis CL of the drive shaft 205 and is a separate member from the fan housing 284. With such a structure, the fan housing 284 and the fan frame 285 may be made of different materials.

For example, the fan housing 284 may be made of a metal having high thermal conductivity (for example, aluminum, iron, or copper), and the fan frame 285 may be made of resin. With such a combination, the overall cost of the fan cover 251 can be reduced, and the weight can be reduced. The combination of the material of the fan housing 284 and the material of the fan frame 285 is not limited to the embodiment described above. Arbitrary materials may be selected as materials for the fan housing 284 and the fan frame 285.

The embodiment of the present invention has been described so far, but the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

The present invention can be used for an electric motor assembly.

DESCRIPTION OF SYMBOLS 1 Motor assembly 2 Motor part 3 Inverter part 5 Drive shaft 6 Rotor 7 Stator 7a Stator core 7b Winding 8 Motor 10 Motor casing 11 Motor frame 11a Outer surface 12 End cover 13 Bracket 13a Outer surface 15 Annular convex part 20 Inverter case 21 Inverter case 22 Inverter frame 23 Cover member 24 Projection part 25 Cooling fan 27 Bearing 28 Bearing 30 Through hole 32 Bearing support part 33 Bearing support part 40 Through hole 41 Inverter element 42 Substrate 43 Spacer 50 Shaft cover 51 Fan cover 51a Opening 52 Cylindrical part 52a Inner surface 52b Connection part 53 Taper part (fan case part)
55 Fan cover side rectifying protrusion 55a End face 56 Inverter case side rectifying protrusion 56a End face 57 Motor casing side rectifying protrusion 60 Positioning structure 61 First vertical positioning hole 61a Through hole 61b Screw hole 62 Second vertical positioning hole 62a Through hole 62b Screw hole 63 1st positioning tool 64 2nd positioning tool 70 1st parallel positioning hole 70a Screw hole 70b Through hole 71 2nd parallel positioning hole 72 Through bolt 80 1st protrusion 81 1st fitting groove 82 2nd protrusion 83 2nd fitting Groove 84 Fan housing 85 Fan frame 201 Motor assembly 202 Motor unit 203 Inverter unit 205 Drive shaft 206 Rotor 207 Stator 207a Stator core 207b Winding 208 Motor 210 Motor casing 211 Motor frame 212 Cover 213 Motor side plate 220 Inverter 221 Inverter case 222 Inverter frame 223 Cooling fan side cover member 224 Motor casing side cover member 225 Cooling fan 227, 228 Bearing 230, 231 Through hole 232, 233 Bearing support portion 236 Fin 239, 240 Through hole 239a , 240a Annular groove 241 Inverter element 242 Substrate 250 Cylindrical wall 250a One end 250b The other end 250c Main body 251 Fan cover 251a Opening 252 Tube 253 Taper (fan case)
256, 257 Cooling fins 258, 259 Seal member 260 Projection member 265 Ring members 265a, 265b Both end surfaces 265c Outer peripheral end surface 266 Air hole 267 Through hole 270 Spacer 280 Channel 281 Communication space 284 Fan housing 285 Fan frame

Claims (21)

A motor casing that houses a rotor and a stator for rotating the drive shaft;
An inverter case that houses an inverter disposed adjacent to the rotor and the stator, and is connected in series to the motor casing along the axial direction of the drive shaft;
A cooling fan disposed outside the inverter case and fixed to the drive shaft;
A fan cover connected to the inverter case so as to cover the cooling fan;
A first fan cover side rectifying protrusion and a second fan cover side rectifying protrusion extending inward from the inner surface of the fan cover;
A first inverter case side rectifying protrusion and a second inverter case side rectifying protrusion extending outward from the outer surface of the inverter case;
The first fan cover side rectifying protrusion and the first inverter case side rectifying protrusion are arranged so as to be aligned on a straight line,
The motor assembly according to claim 1, wherein the second fan cover side rectifying protrusion and the second inverter case side rectifying protrusion are arranged so as to be aligned. The electric motor assembly further includes a motor casing side rectification protrusion extending outward from the outer surface of the motor casing,
The motor casing side rectification protrusion is aligned with the first fan cover side rectification protrusion and the first inverter case side rectification protrusion, or the second fan cover side rectification protrusion and the second fan cover side rectification protrusion. The electric motor assembly according to claim 1, wherein the electric motor assembly is arranged so as to be aligned with the inverter case side rectification protrusion. The motor casing side rectification protrusion is a first motor casing side rectification protrusion,
The electric motor assembly further includes a second motor casing side rectification protrusion extending outward from the outer surface of the motor casing,
The first motor casing side rectification protrusion is arranged so as to be aligned with the first fan cover side rectification protrusion and the first inverter case side rectification protrusion,
The second motor casing side rectification protrusion is arranged so as to be aligned with the second fan cover side rectification protrusion and the second inverter case side rectification protrusion. The motor assembly as described. The electric motor assembly according to any one of claims 1 to 3, wherein the electric motor assembly further includes a positioning structure that determines a relative position between the motor casing and the inverter case. The motor casing is
A motor frame to which the stator is fixed;
A bracket for closing the open end of the motor frame,
The inverter case includes an inverter frame disposed adjacent to the bracket;
The positioning structure is
A first vertical positioning hole formed in the motor frame and the bracket and extending in a direction perpendicular to the axial direction of the drive shaft;
A second vertical positioning hole formed in the inverter frame and the bracket and extending in a direction perpendicular to the axial direction of the drive shaft;
A first positioning tool that is inserted into the first vertical positioning hole and determines a relative position between the motor frame and the bracket;
The electric motor assembly according to claim 4, further comprising a second positioning tool that is inserted into the second vertical positioning hole and determines a relative position between the inverter frame and the bracket. The motor casing is
A motor frame to which the stator is fixed;
A bracket for closing the open end of the motor frame,
The inverter case is
An inverter frame disposed adjacent to the bracket;
A cover member for closing the open end of the inverter frame,
The positioning structure is
A first parallel positioning hole formed in the motor frame and the bracket and extending parallel to an axial direction of the drive shaft;
A second parallel positioning hole formed in the cover member and extending parallel to the axial direction of the drive shaft;
A through bolt inserted into the first parallel positioning hole and the second parallel positioning hole in a state where the bracket and the inverter frame are sandwiched between the cover member and the motor frame. Item 5. The electric motor assembly according to Item 4. The motor casing is
A motor frame to which the stator is fixed;
A bracket for closing the open end of the motor frame,
The inverter case includes an inverter frame disposed adjacent to the bracket;
The positioning structure is
A first protrusion formed on the bracket and extending toward the motor frame;
A first fitting groove formed in the motor frame and into which the first protrusion is fitted;
A second protrusion formed on the bracket and extending toward the inverter frame;
The motor assembly according to claim 4, further comprising a second fitting groove formed in the inverter frame and into which the second protrusion is fitted. The electric motor set according to any one of claims 1 to 7, wherein the fan cover covers the inverter case and the motor casing and extends along an axial direction of the drive shaft. Solid. The fan cover is
A cylindrical portion covering at least a part of the motor casing;
The electric motor assembly according to claim 8, further comprising a fan case portion configured integrally with the tube portion. The fan cover is
A fan frame covering at least a part of the motor casing;
The electric motor assembly according to claim 8, further comprising a fan housing configured separately from the fan frame. A drive shaft;
A motor for rotating the drive shaft;
A motor casing in which the motor is disposed;
An inverter for controlling the operation of the motor;
An inverter case in which the inverter is disposed and through which the drive shaft passes;
A cooling fan disposed adjacent to the inverter case and fixed to an end of the drive shaft;
A cylindrical wall disposed inside the inverter case so as to cover the periphery of the drive shaft, and forming a flow path of air flowing by rotation of the cooling fan;
A spacer that is interposed between the motor casing and the inverter case, and that forms a communication space between the motor casing and the inverter case, the communication space communicating the air flow path and the external space. Motor assembly. The inverter case is
A cooling fan side cover member adjacent to the cooling fan and having a first through hole through which the drive shaft passes;
A motor casing side cover member having a second through hole adjacent to the motor casing and through which the drive shaft passes,
The cylindrical wall is
One end connected to the first through hole of the cooling fan side cover member;
The motor assembly according to claim 11, further comprising: the other end portion connected to the second through hole of the motor casing side cover member. The motor casing includes a motor side plate adjacent to the motor casing side cover member,
The spacer includes a plurality of projecting members disposed between the motor casing side cover member and the motor side plate and arranged at equal intervals along a circumferential direction of the motor side plate. The electric motor assembly according to claim 12. The motor casing includes a motor side plate adjacent to the motor casing side cover member,
The spacer is provided between the motor casing side cover member and the motor side plate, and includes a ring member in which the communication space is formed.
The electric motor assembly according to claim 12, wherein the ring member has an air hole that constitutes a part of the communication space. The cylindrical wall, the cooling fan side cover member, and the motor casing side cover member are separate members,
A first seal member is disposed between one end of the cylindrical wall and the first through hole of the cooling fan side cover member,
The second seal member is disposed between the other end portion of the cylindrical wall and the second through hole of the motor casing side cover member. An electric motor assembly according to item. The cylindrical wall is an integrally formed member with any one of the cooling fan side cover member and the motor casing side cover member,
When the cylindrical wall and the cooling fan side cover member are integrally formed members, a seal member is provided between the other end of the cylindrical wall and the second through hole of the motor casing side cover member. Has been placed,
When the cylindrical wall and the motor casing side cover member are integrally formed members, a seal member is disposed between one end of the cylindrical wall and the first through hole of the cooling fan side cover member. The electric motor assembly according to any one of claims 12 to 14, wherein the electric motor assembly is provided. The air flow path is parallel to the drive shaft;
The motor assembly according to any one of claims 11 to 16, wherein the communication space is perpendicular to the air flow path. The electric motor assembly according to any one of claims 11 to 17, wherein a radiation fin is formed on an inner peripheral surface of the cylindrical wall. The electric motor assembly includes a fan cover that covers the cooling fan,
The electric motor set according to any one of claims 11 to 18, wherein the fan cover covers the inverter case and the motor casing, and extends along an axial direction of the drive shaft. Solid. The fan cover is
A cylindrical portion covering at least a part of the motor casing;
The electric motor assembly according to claim 19, further comprising a fan case portion configured integrally with the tube portion. The fan cover is
A fan frame covering at least a part of the motor casing;
The electric motor assembly according to claim 19, further comprising a fan housing configured separately from the fan frame.

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