CN110011457B - Motor stator structure with integrated heat pipe and iron core - Google Patents

Abstract

The invention discloses a motor stator structure with integrated heat pipe and iron core, comprising a winding component, an iron core component and a heat pipe radiator component, wherein the iron core component is formed by stacking silicon steel sheets or other soft magnetic materials, the section shape of the heat absorption end of the heat pipe radiator is consistent with the shape of an iron core lamination, the heat absorption end is uniformly embedded in the iron core component and the upper and lower ends in the axial direction, the winding component is wound on the motor stator teeth and the heat absorption end of the heat pipe radiator, the heat absorption end of the heat pipe radiator is directly contacted with the iron core component and the winding component to absorb heat emitted by a motor during working, a plurality of L-shaped heat conduction pipelines are arranged on the peripheral surface of the heat pipe radiator component, L-shaped heat conduction pipelines are in one-to-one correspondence with the plurality of heat absorption ends of the heat pipe radiator, each L-shaped heat conduction pipeline is bent towards the axial direction, and fins are arranged at the tail ends of each L-shaped heat conduction pipeline at the heat absorption.

Description

Motor stator structure with integrated heat pipe and iron core

technical field

The invention belongs to the technical field of motors, and particularly relates to a motor stator structure in which a heat pipe and an iron core are integrated.

Background technique

With the advancement of technologies such as permanent magnet materials, soft magnetic materials, and power electronic devices, the power density and torque density of motor systems are getting higher and higher. In the ship propulsion system, the application of high power density and high torque density motor system is more and more extensive. On the one hand, the increase of the output torque of the motor is inseparable from the increase of the current in the motor winding. On the other hand, in the case of the same volume or weight, if you want to increase the output power of the motor, you can achieve it by increasing the speed of the motor. These two technical approaches will increase the loss of the motor body and cause the motor to heat up. If the heat loss cannot be dissipated quickly and in time, the motor winding temperature will be too high, the insulation layer of the motor stator enameled wire winding will be damaged, the service life of the motor will be reduced, or the motor will be directly burned. Therefore, the structure with high heat dissipation capacity is very important for the safe and reliable operation of the motor system.

Typically, high power density or high torque density motor systems use water cooling (liquid cooling) to dissipate heat. Such a cooling method needs to design a special cooling liquid flow channel in the motor housing, and needs to configure a water cooler (or a liquid supply device), so that the overall system structure is more complicated, and the expenditure and maintenance costs are higher. In some environments with strict requirements on volume and quality, water-cooled machines cannot be used, and the temperature is low, motors using water-cooled methods cannot be used. Therefore, there is a motor that uses heat pipes for heat conduction and heat dissipation. For example, in ZL200580031558.5, the heat pipe is inserted into the magnetic pole of the stator iron core, the heat pipe adopts a cylindrical structure, and the heat exchanger is inside the iron core. This structure is suitable for the motor structure of the stator in the outer rotor. In ZL201310331307.5, the heat pipe is arranged in the contact part between the outer diameter of the stator core and the stator housing, the inner diameter of the rotor core and the rotating shaft, and the outer diameter of the bearing and the bearing chamber of the end cover. In 201210098925.5, a structure of inserting flat heat pipes into the stator stack is proposed.

To sum up, in the structure of using heat pipes to dissipate heat from the motor body proposed in the prior art, the heat pipes are mostly arranged in the stator or the rotor iron core. The main heat source and weak link of the motor stator are the stator windings, so the effect of such a heat dissipation structure is not ideal.

SUMMARY OF THE INVENTION

In order to solve the problems of the prior art, the present invention proposes a motor stator structure with integrated heat pipe and iron core, which is a stator heat dissipation structure suitable for a high power density or high torque density motor in a low temperature environment. It can improve the heat dissipation capacity of the motor body, reduce the temperature rise of the winding, and then improve the efficiency and long-term operation reliability of the motor system.

The present invention is realized by the following technical solutions: a motor stator structure in which a heat pipe and an iron core are integrated, including a winding assembly and an iron core lamination assembly, wherein the iron core lamination assembly is formed by stacking at least a section of stator iron core, and the winding Components are wound within the core laminations,

The motor stator structure also includes a heat pipe radiator assembly and fins. The heat pipe radiator assembly is annular, and its cross-sectional shape is consistent with the laminations of the stator iron cores, and is installed at the upper and lower ends of each stator iron core. The inner ring of the heat pipe radiator assembly is the heat absorbing end of the heat pipe, the winding assembly is also wound on the heat absorbing end, and a plurality of L-shaped heat conduction pipes are arranged on the outer peripheral surface of the heat pipe radiator assembly. A plurality of L-shaped heat-conducting pipes are arranged in one-to-one correspondence with the heat-absorbing ends, and each L-shaped heat-conducting pipe is bent in the axial direction, and the rib is installed at the end of each L-shaped heat-conducting pipe.

Further, the core lamination assembly is coaxial with the heat pipe radiator assembly.

Further, the iron core lamination assembly includes a first stator iron core and a second stator iron core, and the heat pipe radiator assembly includes a first heat pipe radiator, a second heat pipe radiator and a third heat pipe radiator, so The first heat pipe radiator, the first stator iron core, the second heat pipe radiator, the second stator iron core and the third heat pipe radiator are vertically stacked in sequence and fixedly connected to form a stator iron core assembly.

Further, the axial cross-sectional shape and size of the first heat pipe radiator, the second heat pipe radiator and the third heat pipe radiator are consistent with the axial cross-sectional shape and size of each stator core, and the The cross sections of the heat absorbing ends of the first heat pipe radiator, the second heat pipe radiator and the third heat pipe radiator may also be slightly smaller in size.

Further, the iron core lamination assembly adopts silicon steel sheet, amorphous alloy or soft magnetic material 1J22.

Further, the heat pipe radiator assembly communicates with the plurality of L-shaped heat conducting pipes.

Further, a gas-liquid two-phase working medium for heat conduction is encapsulated in the heat pipe radiator assembly.

Further, the two-phase working medium is water or ammonia gas-liquid two-phase working medium.

Further, the ends of the plurality of L-shaped heat conduction pipes are closed.

Further, the plurality of L-shaped heat conducting pipes on the second heat pipe radiator and the plurality of L-shaped heat conducting pipes on the first heat pipe radiator and the third heat pipe radiator are arranged alternately.

Further, the winding assembly is wound on the iron core laminations and the plurality of heat absorbing ends by enameled wires.

Further, at least one heat absorbing end is located at the end of the winding assembly.

The beneficial effects of the present invention are:

(1) The stator of the motor adopts a heat pipe for heat conduction and heat dissipation, and no additional liquid cooling device is required. The system has a simple structure, small size and light weight, which can improve the power density and torque density of the motor system;

(2) There will be no problem of freezing and clogging of liquid pipelines, and it is suitable for use in low temperature and low pressure environments;

(3) The heat-absorbing end of the heat pipe is directly in contact with the iron core and the winding, and the heat conduction efficiency is high, the heat source is directly cooled, and the heat dissipation efficiency is high.

Description of drawings

1 is a schematic diagram of the overall structure of the motor stator structure with integrated heat pipe and iron core proposed by the present invention;

Fig. 2 is the structural schematic diagram of the heat pipe assembly in Fig. 1;

FIG. 3 is an axial view of the heat pipe assembly in FIG. 1;

4 is a schematic cross-sectional view of FIG. 1;

Figure 5 is a schematic structural diagram of a rib, wherein: Figure 5 (A) is a schematic structural diagram when the rib is elongated; Figure 5 (B) is a schematic structural diagram when the rib is fan-shaped; Figure 5 (C) is a rib Schematic diagram of the structure when the sheet is circular;

FIG. 6 is a schematic structural diagram of the present invention when a single-segment core lamination assembly is adopted.

Among them, 1 is the winding assembly, 2 is the iron core lamination assembly, 2-1 is the first stator iron core, 2-2 is the second stator iron core, 3 is the heat pipe radiator assembly, and 3-1 is the first heat pipe The radiator, 3-2 is the second heat pipe radiator, 3-3 is the third heat pipe radiator, and 4 is the fin.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIGS. 1-4, the present invention proposes an embodiment of a motor stator structure in which a heat pipe and an iron core are integrated, including a winding assembly 1 and an iron core lamination assembly 2, and the iron core lamination assembly 2 consists of at least one The stator core is stacked, and the winding assembly 1 is wound in the core lamination 2.

The motor stator structure also includes a heat pipe radiator assembly 3 and fins 4. The heat pipe radiator assembly 3 is annular and is installed at the upper and lower ends of each stator core, and the inner ring of the heat pipe radiator assembly 3 is the heat absorption of the heat pipe. At the end, the winding assembly 1 is also wound on a plurality of heat absorbing ends. The outer peripheral surface of the heat pipe radiator assembly 3 is provided with a plurality of L-shaped heat conduction pipes, and the plurality of L-shaped heat conduction pipes are arranged one-to-one with the plurality of heat absorption ends. , and each L-shaped heat-conducting pipe is bent in the axial direction, and the rib 4 is installed at the end of each L-shaped heat-conducting pipe.

Referring to FIG. 1 , in the preferred embodiment of this part, the core lamination assembly 2 is coaxial with the heat pipe radiator assembly 3 .

1-4, in the preferred embodiment of this part, the iron core lamination assembly 2 includes a first stator iron core 2-1 and a second stator iron core 2-2, and the heat pipe radiator assembly 3 includes a first stator iron core 2-1 and a second stator iron core 2-2. A heat pipe radiator 3-1, a second heat pipe radiator 3-2, a third heat pipe radiator 3-3, a first heat pipe radiator 3-1, a first stator core 2-1, a second heat pipe radiator 3-2. The second stator core 2-2 and the third heat pipe radiator 3-3 are vertically stacked in sequence and fixedly connected to form a stator core assembly.

Specifically, in this embodiment, the iron core lamination assembly 2 is composed of two stator iron cores. Therefore, the heat absorbing end of the second heat pipe radiator 3-2 is embedded between the two stator iron cores, and is connected to the winding assembly 1 In contact with the stator iron core, the heat absorbing ends of the first heat pipe radiator 3-1 and the third heat pipe radiator 3-3 pass through the upper end of the first stator iron core 2-1 and the second stator iron core 2-2 respectively. The lower end of the coil extends toward the axis of the core lamination assembly 2 and is in contact with the winding assembly 1 and the stator core. During the operation of the motor, the heat emitted by the winding assembly 1 and the two stator cores will be quickly conducted by the heat pipe radiator assembly 3. Disperse to the fins 4. In this embodiment, the L-shaped heat-conducting pipes are connected with a plurality of heat-absorbing segments, and the fins 4 and the heat-dissipating segments are combined to form an L-shape. As shown in FIG. 5 , the fins 4 can be in the shape of strips, sectors, circles or inclined sectors (not shown in this shape), and the fins 4 are made of good thermal conductors, such as aluminum or copper. The sheet 4 can increase the heat dissipation area, quickly dissipate heat and reduce the temperature of the motor stator. The motor using this stator structure can quickly and efficiently dissipate the heat loss of the motor under the condition of high torque and high power output, reduce the working temperature of the motor, and improve the power density and efficiency of the motor.

Referring to FIG. 1, in the preferred embodiment of this part, the axial cross-section of the heat-absorbing end of the first heat pipe radiator 3-1, the second heat pipe radiator 3-2 and the third heat pipe radiator 3-3 The shape and size are consistent with the shape and size of the axial cross section of each stator iron core.

In the preferred embodiment of this section, the axial cross-sectional shape of the heat-absorbing end of the first heat pipe radiator 3-1, the second heat pipe radiator 3-2 and the third heat pipe radiator 3-3 is the same as that of each stator. The axial cross-sectional shapes of the iron cores are the same, and the axial cross-sectional dimensions of the heat-absorbing ends of the first heat pipe radiator 3-1, the second heat pipe radiator 3-2 and the third heat pipe radiator 3-3 are slightly smaller than the size of each sheet The axial cross-sectional dimension of the stator core.

In the preferred embodiment of this part, the iron core lamination assembly 2 adopts the iron core lamination assembly 2 and adopts silicon steel sheet, amorphous alloy or soft magnetic material 1J22.

Specifically, the iron core laminations 2 can be made of silicon steel sheets or soft magnetic alloys.

1-3, in the preferred embodiment of this part, the heat pipe radiator assembly 3 communicates with a plurality of L-shaped heat conducting pipes.

In the preferred embodiment of this part, the heat pipe radiator assembly 3 is filled with a gas-liquid two-phase working medium for conducting heat.

In the preferred embodiment of this section, the two-phase working medium is water or ammonia gas-liquid two-phase working medium.

Specifically, the heat pipe radiator assembly 3 and the L-shaped heat conduction pipe are filled with a two-phase working medium. In this embodiment, water and ammonia gas-liquid two-phase working medium are used. In other embodiments, other two-phase working medium can also be used. . Based on the phase change principle, when the heat pipe radiator assembly 3 directly absorbs the heat generated by the copper loss of the winding assembly 1 and the iron loss of the iron core lamination assembly 2 during the working process of the motor, the internal two-phase working medium absorbs heat and is converted into a liquid state. In the gaseous state, the heat is quickly conducted to the fins 4 through the L-shaped heat conduction pipe to dissipate the heat.

Referring to Figure 1, in the preferred embodiment of this part, the ends of a plurality of L-shaped heat-conducting pipes are closed, and the liquid working medium inside the heat pipes absorbs heat and vaporizes. After the fins 4 are dissipated, the gaseous working medium is converted into a liquid state and returned to the heat-absorbing end, and the cycle works back and forth.

Specifically, openings are provided at the ends of the plurality of L-shaped heat-conducting pipes to dissipate the vaporized two-phase working medium. One is to quickly dissipate heat, and the other is to prevent the multiple L-shaped heat-conducting pipes from vaporizing the two-phase working medium. And the pressure inside the heat pipe radiator assembly 3 is too large.

1, in the preferred embodiment of this part, the plurality of L-shaped heat conduction pipes on the second heat pipe radiator 3-2 and the first heat pipe radiator 3-1 and the third heat pipe radiator 3-3 on the A plurality of L-shaped heat conduction pipes are staggered.

Specifically, the gathering of multiple L-shaped heat-conducting pipes in one place will lead to overheating of the local external environment, and the temperature difference between the inside and outside is small, which affects the speed of heat exchange. Therefore, in this embodiment, adjacent L-shaped heat-conducting pipes need to be separated from each other. A certain distance, try to make all the L-shaped heat conduction pipes evenly distributed along the circumferential direction, so as to better achieve the heat dissipation effect.

Referring to FIG. 1 and FIG. 4 , in the preferred embodiment of this part, the winding assembly 1 is wound on the core lamination 2 and the plurality of heat absorbing ends by enameled wires.

Referring to FIG. 1 , in the preferred embodiment of this part, at least one heat-absorbing end is located at the end of the winding assembly 1 .

The present invention also proposes another embodiment. This embodiment is a case where the core lamination assembly 2 is not segmented. Referring to FIG. 6 , the motor stator is a vertical installation structure, including a winding assembly 1, an iron core stack Sheet assembly 2, heat pipe radiator assembly 3 and fins 4, heat pipe radiator assembly 3 includes first heat pipe radiator 3-1 and second heat pipe radiator 3-2, the stator of this embodiment also includes motor stator slot insulation, etc. regular structure. The winding assembly 1 is wound on the core lamination assembly 2, the first heat pipe radiator 3-1 and the second heat pipe radiator 3-2 by using enameled copper wire to form a motor stator structure. The iron core lamination assembly 2 is formed by stacking silicon steel sheets, soft magnetic alloys or other soft magnetic materials. A first heat pipe radiator 3 - 1 is installed at one end of the core lamination assembly 2 , and a second heat pipe radiator 3 - 2 is installed at the other end of the iron core lamination assembly 2 . The heat pipe radiator assembly 3 and its cross-sectional shape are shown in FIGS. 2 and 3 . The shape and structure of the first heat pipe radiator 3-1 and the second heat pipe radiator 3-2 are the same. The heat-absorbing end of the heat pipe radiator assembly 3 is embedded in the winding assembly 1 and the stator core lamination assembly 2, and is in contact with the winding assembly 1 and the iron core lamination assembly 2 through process measures such as dipping or potting, as shown in the figure. 4 shown. Other components and working principles are the same as those of the previous embodiment.

Claims (8)

1. The motor stator structure with the heat pipe and the iron core integrated comprises a winding assembly (1) and an iron core laminated assembly (2), wherein the iron core laminated assembly (2) is formed by stacking at least one section of stator iron core, the winding assembly (1) is wound in the iron core laminated assembly (2),

the motor stator structure is characterized by further comprising a heat pipe radiator assembly (3) and fins (4), wherein the heat pipe radiator assembly (3) is annular and is arranged at the upper end and the lower end of each section of stator core, the inner end of the heat pipe radiator assembly (3) is a heat absorption end, a plurality of heat absorption ends are arranged, the axial cross section of the heat absorption end of the heat pipe radiator assembly (3) is consistent with that of the stator core lamination, the winding assembly (1) is wound on the heat absorption ends, a plurality of L-shaped heat conduction pipelines are arranged on the outer peripheral surface of the heat pipe radiator assembly (3), the L-shaped heat conduction pipelines are arranged corresponding to the heat absorption ends, each L-shaped heat conduction pipeline is bent in the axial direction, and the fins (4) are arranged at the tail end of each L-shaped heat conduction pipeline,

the iron core laminated assembly (2) comprises a first stator iron core (2-1) and a second stator iron core (2-2), the heat pipe radiator assembly (3) comprises a first heat pipe radiator (3-1), a second heat pipe radiator (3-2) and a third heat pipe radiator (3-3), the first heat pipe radiator (3-1), the first stator iron core (2-1), the second heat pipe radiator (3-2), the second stator iron core (2-2) and the third heat pipe radiator (3-3) are longitudinally stacked in sequence and fixedly connected to form a stator iron core assembly,

the L-shaped heat conducting pipelines on the second heat pipe radiator (3-2) and the L-shaped heat conducting pipelines on the first heat pipe radiator (3-1) and the third heat pipe radiator (3-3) are arranged in a staggered mode.

2. A heat pipe and core integrated motor stator structure according to claim 1, characterized in that the core lamination assembly (2) is coaxial with the heat pipe radiator assembly (3).

3. The stator structure of the motor integrating the heat pipe and the iron core as claimed in claim 1, wherein the shape and size of the axial section of the heat absorption end of the first heat pipe radiator (3-1), the second heat pipe radiator (3-2) and the third heat pipe radiator (3-3) are consistent with the shape and size of the axial section of each piece of the stator iron core.

4. The stator structure of the motor integrating the heat pipe and the iron core as claimed in claim 1, wherein the axial cross-sectional shape of the heat absorption end of the first heat pipe radiator (3-1), the second heat pipe radiator (3-2) and the third heat pipe radiator (3-3) is consistent with the axial cross-sectional shape of each stator iron core, and the axial cross-sectional dimension of the heat absorption end of the first heat pipe radiator (3-1), the second heat pipe radiator (3-2) and the third heat pipe radiator (3-3) is slightly smaller than the axial cross-sectional dimension of each stator iron core.

5. The motor stator structure with integrated heat pipe and iron core as claimed in claim 1, wherein the iron core laminated sheet assembly (2) is made of silicon steel sheet, amorphous alloy or soft magnetic material 1J 22.

6. A heat pipe and core integrated motor stator structure according to claim 1, wherein the heat absorption end of the heat pipe radiator assembly (3) is communicated with the plurality of L-shaped heat conduction pipes.

7. The motor stator structure integrated by the heat pipe and the iron core as claimed in claim 6, wherein the heat pipe radiator assembly (3) is filled with two-phase working medium for heat conduction, and the two-phase working medium is water or ammonia liquid two-phase working medium.

8. The stator structure of the motor with integrated heat pipe and iron core as claimed in claim 1, wherein the winding assembly (1) is wound on the iron core lamination (2) and the heat absorption end of the heat pipe radiator by enameled wire, and the heat absorption end of at least one heat pipe radiator is located at the end position of the winding assembly (1).

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