Heat dissipation structure of motor stator, motor and vehicle

Abstract

This utility model belongs to the field of motor technology and discloses a heat dissipation structure for a motor stator, a motor, and a vehicle. The heat dissipation structure for the motor stator includes a stator core, a motor housing, and a phase change heat pipe. A first groove is provided on the outer peripheral wall of the stator core. The motor housing is fitted around the outer periphery of the stator core, and a second groove is provided on the inner peripheral wall of the motor housing. The second groove and the first groove are connected radially to each other in the stator core, forming a limiting groove. The phase change heat pipe contains a phase change material and includes a first phase change tube, which is disposed within the limiting groove. The heat dissipation structure for the motor stator is simple in structure, low in cost, reduces the transient temperature rise of the motor, reduces the impact on the magnetic circuit of the stator, and reduces the negative impact of interference stress between the stator core and the motor housing.

Description

Technical Field

[0001] This utility model relates to the field of electric motors, and in particular to a heat dissipation structure for an electric motor stator, an electric motor, and a vehicle. Background Technology

[0002] Motors for new energy vehicles are characterized by high power density, high electromagnetic load, and compact size. However, temperature rise has become a key bottleneck restricting further improvements in motor power and torque density. When the motor is operating at peak torque, the stator windings generate significant DC and AC losses, leading to high transient temperature rise. This poses a significant and severe challenge to the motor's insulation performance and durability.

[0003] Currently, oil cooling is a common cooling method for motor stators. For example... Figure 1 As shown, a stator core 1 is housed within the motor housing 2, and a stator winding 3 is mounted on the stator core 1. Oil holes 4 are located on the stator yoke of the stator core 1, and these oil holes 4 are evenly distributed circumferentially along the stator yoke. Cooling oil generally possesses high heat capacity, good thermal conductivity, and insulation properties, allowing it to directly contact key components such as the motor stator, absorbing the heat generated by these components. It then flows through a designed cooling circuit to quickly remove the heat generated during motor operation. However, oil cooling has the following limitations: 1. The oil cooling system has a relatively complex structure, generally requiring the installation of oil pumps and other related components, resulting in higher initial installation and maintenance costs; 2. When the motor system load changes rapidly, transient temperature rises occur, and the oil cooling system's response speed is slow, leading to lower-than-expected temperature control efficiency; 3. The oil holes are typically located in the stator yoke, which can affect the magnetic circuit of the stator yoke, exacerbating local saturation and thus increasing iron losses and reducing efficiency. To reduce the impact of oil holes on the magnetic circuit, the stator yoke is usually thickened, but this will increase the size of the motor and reduce the motor's torque density and power density.

[0004] Regarding the fixing method of the motor housing and stator core, the stator core and housing are often installed with an interference fit to keep them relatively fixed. This method will increase the stress on the stator core, thereby reducing the magnetic permeability and increasing the stator iron loss. On the other hand, it will also cause local deformation of the stator core, affecting the sealing and insulation withstand voltage of the stator assembly.

[0005] In some technical solutions, a phase-change heat pipe is installed between the motor housing and the stator core, and the phase-change heat pipe contacts the stator core to achieve heat dissipation. In this solution, the phase-change heat pipe located between the stator core and the motor housing replaces the oil holes in the stator yoke, reducing the impact on the magnetic circuit of the stator core, but there is still room for improvement in its heat dissipation effect. Utility Model Content

[0006] The purpose of this invention is to provide a heat dissipation structure for the stator core and motor stator, as well as a motor and vehicle, to reduce the impact on the magnetic circuit, improve the heat dissipation effect, and reduce the negative impact of interference stress between the stator core and the motor housing.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] The heat dissipation structure of the motor stator includes:

[0009] The stator core has a first groove on its outer peripheral wall;

[0010] The motor housing is fitted around the stator core. A second groove is provided on the inner peripheral wall of the motor housing. The second groove and the first groove are connected in the radial direction of the stator core to form a limiting groove.

[0011] A phase change heat pipe, wherein the phase change heat pipe contains a phase change material, and the phase change heat pipe includes a first phase change tube disposed within the limiting groove.

[0012] Optionally, the length direction of the limiting groove extends along the axial direction of the stator core, and at least one end penetrates the axial end face of the stator core.

[0013] Optionally, the phase change heat pipe further includes a second phase change tube, which is attached to the axial end face, and the first phase change tube extends out of the axial end face and is connected to one end of the second phase change tube.

[0014] Optionally, the second phase change tube is annular.

[0015] Optionally, there are multiple limiting grooves and multiple first phase change tubes, and they correspond one-to-one with each other. The multiple limiting grooves are arranged at intervals along the circumference of the stator core.

[0016] Optionally, the first groove and the second groove are symmetrically arranged about the interface between the stator core and the motor housing.

[0017] Optionally, the phase change material includes a solid-liquid phase change material.

[0018] Optionally, the cross-section of the limiting groove perpendicular to its length direction is rectangular.

[0019] Optionally, the shape of the first phase change tube matches the shape of the limiting groove, and the first phase change tube is conformally attached to the inner wall of the limiting groove.

[0020] The electric motor includes the heat dissipation structure of the motor stator described above.

[0021] The vehicle includes a vehicle body and the aforementioned motor, the motor being mounted on the vehicle body.

[0022] The beneficial effects of this utility model are:

[0023] The heat dissipation structure for the motor stator, the motor, and the vehicle provided by this utility model, in the phase change plateau section, the phase change material in the first phase change tube absorbs heat without causing a temperature rise. Therefore, compared with the traditional stator oil cooling method, this solution has a better effect on suppressing transient temperature rise under peak torque conditions, and eliminates the need for oil pumps and other related components, thus reducing the size, weight, and cost of the motor cooling system. Moreover, since the first phase change tube is located at the junction of the stator core and the motor housing, its impact on the stator yoke magnetic circuit is less than that of the traditional oil cooling method. Therefore, it can reduce stator yoke saturation to a certain extent, reduce stator iron loss, and improve motor torque density and efficiency.

[0024] By providing a first groove on the outer peripheral wall of the stator core and a second groove on the inner peripheral wall of the motor housing, the first and second grooves are radially connected to form a limiting groove. The first phase-transformer tube is embedded within this limiting groove. On one hand, the first groove increases the heat dissipation contact area between the first phase-transformer tube and the stator core, and the second groove increases the heat dissipation contact area between the first phase-transformer tube and the motor housing, thus improving the heat dissipation effect of the stator core. On the other hand, the first phase-transformer tube is accommodated by both the first and second grooves, rather than solely by the first groove, thereby avoiding the first groove's... The size is not too large, as an excessively large first groove may affect the magnetic circuit of the stator core. Furthermore, the first phase-change tube cooperates with the limiting groove, and the mutual limiting effect between the first phase-change tube and the limiting groove allows the first phase-change tube to constrain the relative position of the stator core and the motor housing. This eliminates the need for the stator core to be interference-fitted into the motor housing, thus reducing the degree of interference fit between the stator core and the motor housing. This avoids excessive stress on the stator core caused by interference fit, reducing the problems of decreased magnetic permeability and increased stator iron loss due to stress. Simultaneously, it prevents local deformation of the stator core, ensuring the sealing and insulation withstand voltage of the stator assembly, improving the performance and reliability of the motor, and extending the motor's service life. Attached Figure Description

[0025] Figure 1 This is a partial cross-sectional view of the motor stator perpendicular to its axis, provided in the background art;

[0026] Figure 2 This is a partial cross-sectional view of the heat dissipation structure of the motor stator provided in this embodiment of the utility model;

[0027] Figure 3 This is the temperature rise curve of the phase change material provided in this embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the heat dissipation structure of the motor stator provided in this embodiment of the utility model;

[0029] Figure 5 This is a partial structural schematic diagram of the heat dissipation structure of the motor stator provided in an embodiment of this utility model;

[0030] Figure 6 This is a schematic diagram of the phase change heat pipe provided in this embodiment of the utility model;

[0031] Figure 7 This is a partial structural schematic diagram of the phase change heat pipe provided in this embodiment of the present invention.

[0032] In the diagram: 1. Stator core; 2. Motor housing; 3. Stator windings; 4. Oil hole;

[0033] 101. Stator core; 1011. Axial end face; 102. Motor housing; 103. Phase change heat pipe; 1031. First phase change tube; 1032. Second phase change tube; 104. Phase change material;

[0034] 200, limiting groove; 201, first groove; 202, second groove;

[0035] 301. First temperature rise stage; 302. Phase change plateau stage; 303. Second temperature rise stage. Detailed Implementation

[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and indicated herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0044] like Figure 2 As shown, this embodiment provides a heat dissipation structure for a motor stator, which includes a stator core 101, a motor housing 102, and a phase change heat pipe 103.

[0045] like Figure 2As shown, a first groove 201 is provided on the outer peripheral wall of the stator core 101. A motor housing 102 is fitted around the outer periphery of the stator core 101. A second groove 202 is provided on the inner peripheral wall of the motor housing 102. The second groove 202 and the first groove 201 are connected radially to each other in the stator core 101, together forming a limiting groove 200. A phase change heat pipe 103 contains a phase change material 104. The phase change heat pipe 103 includes a first phase change tube 1031, which is disposed within the limiting groove 200.

[0046] The phase change heat pipe 103 is made of thermally conductive materials, such as copper or aluminum alloys, to ensure rapid heat transfer. The phase change material 104 is a substance that undergoes a phase transition at a specific temperature, accompanied by the absorption or release of a large amount of heat. The effect of the phase change material 104 within the phase change heat pipe 103 on suppressing the temperature rise of the motor can be explained by the temperature characteristics of the phase change material 104. Figure 3 As shown, the temperature rise curve of the phase change material 104 can be divided into three stages: the first temperature rise stage 301, the phase change plateau stage 302, and the second temperature rise stage 303.

[0047] like Figure 3 As shown, during the first temperature rise segment 301, the temperature of the phase change material 104 gradually increases with the absorbed heat, and the temperature curve slopes upward, which is a sensible heat absorption process. During this period, the state of the material, such as solid or liquid, will not change, only the temperature rises, and the heat is used to increase the temperature of the material itself.

[0048] like Figure 3 As shown, in phase transition plateau segment 302, when the material reaches its specific phase transition temperature, a distinct plateau appears in the temperature rise curve. This is because the material is undergoing a phase transition, such as changing from a solid to a liquid state. During this process, the material absorbs heat but its temperature remains constant because the heat is used to overcome intermolecular forces or lattice energy, rather than to raise the temperature. This portion of heat is called latent heat. The width and height of phase transition plateau segment 302 are related to the latent heat of phase transition of the material, i.e., how much energy the material can store or release during the phase transition. The greater the latent heat of phase transition, the wider the plateau segment.

[0049] like Figure 3 As shown, in the second temperature rise stage 303, after the phase change material 104 completes the phase change, the material continues to absorb heat, and its temperature begins to rise again, with the temperature curve sloping upwards. This is because the material has completely entered another phase state, such as complete liquefaction, and its heat capacity determines the rate of continued temperature rise.

[0050] During the cooling process, the above process is reversed. The phase change material 104 releases heat, and similarly, the latent heat is released in the phase change plateau section 302. The temperature remains unchanged until it is completely solidified or transforms back to the original phase.

[0051] like Figure 2 As shown, in this embodiment, by placing the first phase change tube 1031 within the first groove 201 and the second groove 202, the phase change material 104 in the first phase change tube 1031 absorbs heat in the phase change platform section 302 without causing a temperature rise. Therefore, compared to the traditional stator oil cooling method, this solution has a better effect on suppressing transient temperature rise under peak torque conditions of the motor, and eliminates the need for oil pumps and other related components, thus reducing the volume, weight, and cost of the motor cooling system. Moreover, since the first phase change tube 1031 is located at the junction of the stator core 101 and the motor housing 102, its impact on the stator yoke magnetic circuit is less than that of the traditional oil cooling method. Therefore, it can reduce stator yoke saturation to a certain extent, reduce stator iron loss, and improve motor torque density and efficiency.

[0052] like Figures 1-7 As shown, the heat dissipation structure of the motor stator provided in this embodiment includes a first groove 201 on the outer peripheral wall of the stator core 101 and a second groove 202 on the inner peripheral wall of the motor housing 102. The first groove 201 and the second groove 202 are radially connected to form a limiting groove 200. The first phase-change transistor 1031 is embedded in the limiting groove 200. On the one hand, the first groove 201 increases the heat dissipation contact area between the first phase-change transistor 1031 and the stator core 101, and the second groove 202 increases the heat dissipation contact area between the first phase-change transistor 1031 and the motor housing 102, which is beneficial to improving the heat dissipation effect of the stator core 101. On the other hand, the first phase-change transistor 1031 is accommodated by the cooperation of the second groove 202 and the first groove 201, rather than by the first groove 202 alone. A single groove 201 is used to accommodate the stator core 101, thus preventing the first groove 201 from being too large and affecting the magnetic circuit of the stator core 101. Furthermore, the first phase-change tube 1031 cooperates with the limiting groove 200, and the first phase-change tube 1031 and the limiting groove 200 have a mutual limiting effect. This allows the first phase-change tube 1031 to constrain the relative position of the stator core 101 and the motor housing 102, enabling the stator core 101 to be positioned and installed in the motor housing 102 without interference fitting. Therefore, the degree of interference fit between the stator core 101 and the motor housing 102 is reduced, avoiding excessive stress on the stator core 101 caused by interference fit, and reducing the problems of reduced magnetic permeability and increased stator iron loss due to stress. At the same time, it prevents local deformation of the stator core 101, ensures the sealing and insulation withstand voltage of the stator assembly, improves the performance and reliability of the motor, and extends the service life of the motor.

[0053] like Figure 2As shown, optionally, the limiting groove 200 extends along the axial direction of the stator core 101, and at least one end penetrates the axial end face 1011 of the stator core 101. The limiting groove 200 and the first phase change tube 1031 extending along the axial direction of the stator core 101 achieve mutual fixation between the motor housing 102 and the stator core 101 in the circumferential direction, and also provide a uniform heat dissipation effect on the motor stator in the axial direction. The first phase change tube 1031 can be easily inserted into the axial end face 1011 of the stator core 101, making the first phase change tube 1031 of the phase change heat pipe 103 easier to install and remove, facilitating operation of the phase change heat pipe 103 during motor assembly, maintenance, or component replacement, and improving production and maintenance efficiency.

[0054] In other embodiments, the limiting groove 200 between the stator core 101 and the motor housing 102 can be bent at will. For example, the limiting groove 200 is spiral-shaped and spirally wound around the interface between the stator core 101 and the motor housing 102. This arrangement, on the one hand, helps to further increase the heat dissipation area, and on the other hand, helps to enhance the limiting effect between the motor housing 102 and the stator core 101.

[0055] Optionally, the phase change heat pipe 103 further includes a second phase change tube 1032, which abuts against the axial end face 1011. The first phase change tube 1031 extends beyond the axial end face 1011 and is connected to one end of the second phase change tube 1032. The second phase change tube 1032, abutting against the axial end face 1011, further enhances the heat dissipation capacity of the motor stator and optimizes the motor's heat dissipation effect. Moreover, the second phase change tube 1032 and the stator core 101 mutually limit each other, facilitating the installation and positioning of the phase change heat pipe 103 within the limiting groove 200.

[0056] Optionally, the second phase converter 1032 is annular and abuts against the axial end face 1011, thereby further enhancing the heat dissipation capacity of the motor stator.

[0057] In some embodiments, the limiting groove 200 extending axially along the stator core 101 penetrates both axial end faces 1011 of the stator core 101 at both ends. Both ends of the first phase change tube 1031 are connected to second phase change tubes 1032, achieving positioning and heat dissipation effects on the two axial end faces 1011 of the stator core 101.

[0058] like Figure 2As shown, optionally, multiple limiting grooves 200 and first phase change tubes 1031 are provided, and they correspond one-to-one with each other. The multiple limiting grooves 200 are spaced apart circumferentially along the stator core 101. That is, multiple first grooves 201 are spaced apart circumferentially along the stator core 101, and multiple second grooves 202 are spaced apart circumferentially along the stator core 101. The first grooves 201 and their corresponding second grooves 202 are connected to form the limiting grooves 200. The one-to-one correspondence between the multiple limiting grooves 200 and the first phase change tubes 1031, and their spaced apart circumferential arrangement along the stator core 101, ensures a more uniform circumferential fastening connection between the stator core 101 and the motor housing 102, preventing localized loosening or tightening. Simultaneously, the uniformly distributed first phase change tubes 1031 can more comprehensively absorb and transfer the heat generated by the stator core 101, resulting in more balanced circumferential heat dissipation of the motor and improving the overall stability of the motor's performance.

[0059] In some embodiments, a plurality of first phase change tubes 1031 are connected to the same second phase change tube 1032 on the axial end face 1011 at one end of the stator core 101, and the axis of the second phase change tube 1032 coincides with the axis of the stator core 101.

[0060] like Figure 2 As shown, optionally, the first groove 201 and the second groove 202 are symmetrically arranged about the interface between the stator core 101 and the motor housing 102. This symmetrical arrangement makes the force on the stator core 101 and the motor housing 102 more uniform at the connection point, further reducing deformation of the stator core 101 caused by asymmetrical force. This helps maintain the original shape and performance of the stator core 101, ensuring the stability and reliability of the motor operation. In other embodiments, the first groove 201 and the second groove 202 can be designed with different shapes to form an asymmetrical limiting groove 200.

[0061] Optionally, the phase change material 104 includes a solid-liquid phase change material. Utilizing the property of solid-liquid phase change materials to absorb or release a large amount of latent heat during the solid-liquid phase change process, it can more efficiently absorb heat when the motor operating temperature changes, reduce transient temperature rise, effectively stabilize the internal temperature of the motor, and improve the motor's thermal stability and operating efficiency.

[0062] The solid-liquid phase change material in this embodiment should possess the following characteristics: a high phase change enthalpy, enabling it to extend the overload operating time of the motor system; a high thermal conductivity, accelerating the rate of heat absorption and release; minimal supercooling during solidification, striving for complete phase transition near the melting point; no decomposition or failure at high temperatures, and stable material properties during thermal cycling; minimal volume change during phase change to prevent phase separation; avoidance of corrosion to the phase change heat pipe 103 and motor insulation, preventing insulation failure due to material leakage; and uniform melting to avoid affecting the solidification process. For example, the solid-liquid phase change material can be a paraffin-based phase change material, a paraffin or salt-hydrated salt phase change material, sodium acetate trihydrate, etc.

[0063] In practical applications, the performance of phase change material 104 can be improved by modifying its formulation, using nanomaterial reinforcing agents, or employing cross-linking or coating technologies. This can enhance the uniformity, cycle stability, and reliability of phase change material 104, making its temperature rise suppression effect more significant.

[0064] like Figure 2 As shown, optionally, the cross-section of the limiting groove 200 perpendicular to its length direction is rectangular. The rectangular cross-section allows the limiting groove 200 to have a larger contact area, which is beneficial for the phase change heat pipe 103 to have more sufficient contact with the stator core 101 and the motor housing 102, thus improving heat dissipation efficiency. The larger contact area also helps to enhance the connection strength between the stator core 101 and the motor housing 102. To match the shape of the limiting groove 200, the cross-section of the first phase change tube 1031 in its length direction can also be rectangular. In other embodiments, the cross-sections of the limiting groove 200 and the first phase change tube 1031 can be triangular, irregular, etc.

[0065] like Figure 2 As shown, optionally, the shape of the first phase change tube 1031 matches the shape of the limiting groove 200, and the first phase change tube 1031 is conformally attached to the inner wall of the limiting groove 200. "Conformally attached" means that the shape of the first limiting tube perfectly matches the shape of the limiting groove 200, allowing it to be tightly embedded within it. The first limiting tube matches the contour of the limiting groove 200 at all positions and angles. With this configuration, the first phase change tube 1031 achieves full contact with the stator core 101 and the motor housing 102, fully utilizing the heat dissipation effect to optimize the heat dissipation of the stator core 101, and also fully utilizing the positional constraint effect to further reduce the interference fit between the stator core 101 and the motor housing 102, thereby improving the magnetic permeability.

[0066] This embodiment also provides an electric motor, which includes the heat dissipation structure of the motor stator described above.

[0067] like Figures 1-7As shown, the heat dissipation structure of the motor stator described above is adopted, with phase change heat pipe 103 filled with phase change material 104. Furthermore, the first groove 201 increases the heat dissipation contact area between the first phase change tube 1031 and the stator core 101, and the second groove 202 increases the heat dissipation contact area between the first phase change tube 1031 and the motor housing 102, which is beneficial to improving the heat dissipation effect of the motor. On the other hand, the first phase change tube 1031 is jointly accommodated by the second groove 202 and the first groove 201, rather than being accommodated solely by the first groove 201, thereby avoiding the first groove 201 from being too large and affecting the magnetic circuit of the stator core 101. Furthermore, the first phase change tube 1031... The first phase transformer tube 1031 cooperates with the limiting groove 200, and the limiting groove 200 has a mutual limiting effect, thereby enabling the first phase transformer tube 1031 to constrain the relative position of the stator core 101 and the motor housing 102. This allows the stator core 101 to be positioned and installed in the motor housing 102 without interference fit, thus reducing the degree of interference fit between the stator core 101 and the motor housing 102, avoiding excessive stress on the stator core 101 caused by interference fit, and reducing the problems of reduced magnetic permeability and increased stator iron loss caused by stress. At the same time, it prevents local deformation of the stator core 101, ensures the sealing and insulation withstand voltage of the stator assembly, improves the performance and reliability of the motor, and extends the service life of the motor.

[0068] like Figure 4 and Figure 5 As shown in the schematic diagram of the phase change heat pipe 103 installation in this case, the second phase change tube 1032 is installed near the end of the winding and surrounds the entire winding in the circumferential direction, which is beneficial to improving the heat dissipation effect of the motor winding, improving the reliability of motor performance, and extending the service life of the motor.

[0069] In some embodiments, the melting point of the phase change material 104 is higher than the rated operating temperature of the motor but lower than the insulation limit temperature of the motor. This ensures that the phase change material 104 remains in a solid state during normal motor operation, preventing premature melting and a reduction in its heat absorption capacity. When the motor temperature rises close to the insulation limit temperature, the phase change material 104 begins to melt and absorb a large amount of heat, thereby effectively controlling the motor temperature, preventing damage to the insulation performance due to overheating, and ensuring reliable operation of the motor within a safe temperature range.

[0070] This embodiment also provides a vehicle, which includes a vehicle body and the aforementioned motor, the motor being mounted on the vehicle body. Using the aforementioned motor, the vehicle's motor has the same technical characteristics and effects as the motor described above.

[0071] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A heat dissipating structure of a stator of an electric machine, characterized by, include: Stator core (101), wherein a first groove (201) is provided on the outer peripheral wall of the stator core (101); The motor housing (102) is fitted around the stator core (101). The inner circumferential wall of the motor housing (102) is provided with a second groove (202). The second groove (202) and the first groove (201) are connected in the radial direction of the stator core (101) to form a limiting groove (200). A phase change heat pipe (103) having a phase change material (104) inside, the phase change heat pipe (103) including a first phase change tube (1031) disposed in the limiting groove (200).

2. The heat dissipation structure of the motor stator according to claim 1, characterized in that, The length direction of the limiting groove (200) extends along the axial direction of the stator core (101), and at least one end penetrates the axial end face (1011) of the stator core (101).

3. The heat dissipation structure of the motor stator according to claim 2, characterized in that, The phase change heat pipe (103) further includes a second phase change tube (1032), which is attached to the axial end face (1011). The first phase change tube (1031) extends out of the axial end face (1011) and is connected to one end of the second phase change tube (1032).

4. The heat dissipation structure of the motor stator according to claim 3, characterized in that, The second phase change tube (1032) is ring-shaped.

5. The heat dissipation structure for the motor stator according to any one of claims 1-4, characterized in that, Both the limiting groove (200) and the first phase change tube (1031) have multiple grooves, and they correspond one-to-one. The multiple limiting grooves (200) are arranged at intervals along the circumference of the stator core (101).

6. The heat dissipation structure for the motor stator according to any one of claims 1-4, characterized in that, The first groove (201) and the second groove (202) are symmetrically arranged about the interface between the stator core (101) and the motor housing (102).

7. The heat dissipation structure for the motor stator according to any one of claims 1-4, characterized in that, The cross-section of the limiting groove (200) perpendicular to its length direction is rectangular.

8. The heat dissipation structure for the motor stator according to any one of claims 1-4, characterized in that, The shape of the first phase change tube (1031) matches the shape of the limiting groove (200), and the first phase change tube (1031) is conformally attached to the inner wall of the limiting groove (200).

9. An electric motor, characterized in that, Includes the heat dissipation structure of the motor stator as described in any one of claims 1-8.

10. A vehicle, including a vehicle body, characterized in that, It also includes the motor as described in claim 9, the motor being mounted on the vehicle body.

Images