Stator assembly and motor

Abstract

The utility model provides a stator assembly and a motor. The stator assembly includes: a plurality of stacked sheets stacked together and surrounding a slot; and a plurality of metal bars disposed inside the slot and positioned adjacent to each other; wherein at least some of the plurality of metal bars comprise one or more recesses, and the recesses extend along the length direction of the metal bars to form a fluid channel penetrating through the stator assembly. The stator assembly and the motor have the advantages of being simple in structure, easy to implement, convenient to use and the like, and the heat dissipation capability can be improved.

Description

Technical Field

[0001] The present invention relates to the field of electric motor structures. More specifically, the present invention relates to a stator assembly that is designed to provide improved heat dissipation capabilities. The present invention also relates to an electric motor that includes the above-mentioned stator assembly. Background Art

[0002] The motor will emit heat during operation. It is desirable that this heat can be transferred to the outside in a timely manner and avoid local accumulation and temperature rise inside the motor. For example, the copper bar or copper wire in the motor stator can generate significant heat. Therefore, a heat exchange fluid can be used to carry away the heat. The flow channel of the existing heat exchange fluid is usually arranged at the outer surface of the motor stator, and the heat exchange fluid can be in thermal contact with the outer surface of the motor stator, such as the outer surface of the silicon steel sheet stack, and will not contact the copper bar or copper wire. Alternatively, the flow channel of the heat exchange fluid can be arranged in the silicon steel stack of the motor stator, and heat exchange is performed through the silicon steel stack. In such prior art, the heat exchange fluid does not come into contact with the copper bar or copper wire. Utility Model Content

[0003] One aspect of the present application is to provide a stator assembly that provides improved heat dissipation capability. Another aspect of the present application is to provide a motor that includes the above-mentioned stator assembly.

[0004] The purpose of this application is achieved through the following technical solutions:

[0005] A stator assembly comprising:

[0006] a plurality of stacking sheets stacked together and surrounding the slot; and

[0007] a plurality of metal rods disposed within the slot and positioned adjacent to one another;

[0008] At least some of the plurality of metal rods include one or more recesses, which extend along the length of the metal rods to form fluid channels penetrating the stator assembly.

[0009] In the above stator assembly, optionally, the recess is provided at one or more of the following positions: between adjacent metal bars, between the metal bar and the inner surface of the slot, and at a corner of a cross-sectional profile of the metal bar.

[0010] In the above stator assembly, optionally, the recess is in fluid communication with the fluid inlet and the fluid outlet.

[0011] In the above stator assembly, optionally, the slot is configured to have a cross-sectional profile of one of the following: a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof.

[0012] In the above stator assembly, optionally, the metal rod is configured to have a cross-sectional profile of one of the following: a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof.

[0013] In the above stator assembly, optionally, the recess is configured to have a cross-sectional profile of one of the following: ellipse, a portion of an ellipse, a circle, a portion of a circle, a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof.

[0014] In the above stator assembly, optionally, the slot has openings at both ends of the stacked sheets in the axial direction.

[0015] In the above stator assembly, optionally, the slot has an opening at a radial inner surface of the stacked sheets along a radial direction; the stacked sheets include a protrusion located near the radially inward opening of the slot, the protrusion being configured to support a plurality of metal bars.

[0016] In the above stator assembly, optionally, a plurality of stacked sheets are stacked together along the axial direction to form slots extending along the axial direction;

[0017] The length direction of the metal rod is parallel to the axial direction, and the plurality of metal rods are stacked together along the radial direction and / or the circumferential direction.

[0018] In the above stator assembly, optionally, an outer surface of the metal bar except the recess has an insulating layer, and an inner surface of the recess is at least partially exposed.

[0019] In the above stator assembly, optionally, portions of the metal rods opposite to the recesses of adjacent metal rods are at least partially exposed, and a distance between the exposed portions is set to provide insulation performance.

[0020] In the above stator assembly, optionally, the entire outer surface of the metal bar has an insulation layer, wherein the thickness of the insulation layer at the recess is the same as or different from the thickness of the insulation layer at other portions of the metal bar except the recess.

[0021] In the above stator assembly, optionally, the inner surface of the slot is configured to be smooth, or the inner surface of the slot has a continuous serration structure, so that the plurality of metal bars are respectively supported and positioned by the serration structure.

[0022] In the above stator assembly, optionally, it further includes insulating paper, which is arranged between the inner surface of the slot and the outer surface of the metal bar.

[0023] In the above stator assembly, optionally, the fluid channel is used for heat exchange and for circulating an insulating medium for cooling the stator assembly.

[0024] In the above stator assembly, optionally, multiple rows of metal bars are stacked along the radial direction, and the metal bars in each row are arranged side by side within the slots.

[0025] In the above stator assembly, optionally, at least some of the metal bars do not include recesses, and in the same column of metal bars, metal bars including recesses and metal bars not including recesses are alternately arranged.

[0026] In the above stator assembly, optionally, it includes: a plurality of slots arranged along the circumferential direction, and a metal bar is provided in at least a portion of the plurality of slots.

[0027] A motor, comprising:

[0028] the stator assembly described above;

[0029] a rotor assembly disposed adjacent to the stator assembly with an air barrier disposed therebetween; and a housing accommodating the stator assembly and the rotor assembly and attached to the stator assembly.

[0030] In the above-mentioned motor, optionally, the shell and the insulation surround the cavity, the fluid inlet and the fluid outlet are arranged on the shell and connected to the cavity, wherein the stator assembly is arranged within the cavity, the heat exchange fluid enters the motor through the fluid inlet, flows through the cavity and the groove at one end of the motor near the fluid inlet, and the cavity at the other end of the motor near the fluid outlet, and is discharged through the fluid outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will appreciate that these drawings are drawn only for the purpose of illustrating the preferred embodiments and, therefore, should not be construed as limiting the scope of the present application. Furthermore, unless otherwise noted, the drawings are intended only to conceptually represent the composition or configuration of the depicted objects and may contain exaggerated illustrations. The drawings are not necessarily drawn to scale.

[0032] Figure 1 is a schematic cross-sectional view of an embodiment of the motor of the present application.

[0033] Figure 2 yes Figure 1 Partial view of the cross section along the A1-A1 direction.

[0034] Figure 3 It is a partial view of the A1-A1 section of another embodiment of the present application. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present application.

[0036] First, it should be noted that directional terms such as top, bottom, upward, and downward, as used herein, are defined relative to the directions in the respective figures. These directions are relative and will vary depending on the position and state of the device. Therefore, these and other directional terms should not be construed as limiting.

[0037] In addition, it should be pointed out that for any single technical feature described or implied in the embodiments of this document or any single technical feature shown or implied in the accompanying drawings, these technical features (or their equivalents) can be further combined to obtain other embodiments not directly mentioned in this document.

[0038] It should be noted that in different drawings, the same reference numerals denote the same or substantially the same components.

[0039] Figure 1 The overall structure of an embodiment of the motor of the present application is shown. The motor 1 may include: a stator assembly 10, a rotor assembly 20, a housing 30, an isolator 40, a cavity 50, etc. In the illustrated embodiment, the rotor assembly 20 can be mounted on the shaft 22 and pivoted with the axial direction AA as the axis. The stator assembly 10 is fixed relative to the axial direction AA and is positioned at a radially outward position of the rotor assembly 20. In one embodiment, the stator assembly 10 can be positioned at a radially outward position of the radial direction RR. The housing 30 can be positioned further radially outward of the stator assembly 10 and can accommodate the stator assembly 10 and the rotor assembly 20. In one embodiment, the stator assembly 10 can be attached to the housing 30. There may be an isolator 40 and a gap or air gap 21 between the stator assembly 10 and the rotor assembly 20. In one embodiment, the air gap 21 is filled with air. Both ends of the isolator 40 can be attached to the housing 30 to define a cavity 50 between the housing 30 and the isolator 40. As Figure 1 As shown, the stator assembly 10, described in detail below, may be disposed within the cavity 50. In one embodiment, the spacer 40 is insulating and sealed. Figure 2 and Figure 3 What is shown is a portion of the stator lamination, for example, a section of a layer of stator lamination perpendicular to the axial direction AA, and in an actual motor, a plurality of stator laminations are arranged around the rotor assembly 20. Figure 2 or Figure 3 The stator assembly 10 shown, for example, the number of slots 110 included in the entire motor 1 may be 48, 54, or 72.

[0040] Although the separator 40 is shown with discontinuous dotted lines in the drawings, it is easily understood that this is for the purpose of clearly illustrating the position of the separator 40. The separator 40 may actually be continuous and have a solid structure. Figure 1 Schematically shows a number of metal rods 200. It is easy to understand that the number of metal rods 200 can be set according to actual needs.

[0041] A portion of the metal rod 200 may extend through the stator assembly 10 in the axial direction AA, as shown in FIG. Figure 2 and Figure 3 For clarity, Figure 1 The metal rods 200 extending through the stator assembly 10 along the axial direction AA are not shown, and the arrangement of such metal rods 200 may be combined with Figure 2 and Figure 3 Come to understand.

[0042] As used herein, the axial direction AA refers to the direction in which the rotor assembly 20 extends, and may also refer to the direction in which the pivot axis of the rotor assembly 20 is located. In the illustrated embodiment, the axial direction AA may be a direction perpendicular to the paper. The radial direction RR refers to the direction in which a ray emanating from a point on the axial direction AA and extending on a plane perpendicular to the axial direction AA points. In the illustrated embodiment, the radial direction RR may be a direction radiating in all directions. The circumferential direction CC refers to the direction in which the circumference of a circle centered at a point on the axial direction AA and located in a plane perpendicular to the axial direction AA points.

[0043] The stator assembly 10 may include a plurality of stacked sheets 100 and a plurality of metal bars 200. The stacked sheets 100 may be stacked together along the axial direction AA and surround slots 110 located therein. In one embodiment, the stacked sheets 100 may be made of silicon steel or other suitable materials. Each stacked sheet 100, along a circumferential direction perpendicular to the axial direction AA, may be a single, annular piece or formed by splicing multiple stacked sub-sheets along the circumferential direction. In the illustrated embodiment, the cross-section of the slots 110 as viewed in the axial direction AA is generally rectangular. However, the cross-sectional shape of the slots 110 is not limited to that shown. For example, the slots 110 may be configured to have a cross-sectional profile having one of the following: a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof. At least one end of the slots 110 in the axial direction AA may be open to accommodate and accommodate the plurality of metal bars 200. In one embodiment, the slots 110 may be open in the radial direction RR toward the rotor assembly 20, with the opening 111 facing the air gap 21 and the rotor assembly 20. In other words, the opening 111 may be a radially inward opening. The size of the opening 111 may be designed based on requirements, such as parameters such as power loss and torque ripple. The inner surface of the groove 110 may be smooth, or may have a serrated or stepped inner profile to support the metal rod 200.

[0044] In one embodiment, the stack 100 is Figure 1 The position of the middle opening 111 can be closed and does not have a direct opening. In one embodiment, the stacked sheet 100 may be provided with a protrusion 102 at the opening 111. It is easy to understand that the protrusion 102 is not necessary, and in some embodiments, no protrusion is provided at the opening 111. The protrusion 102 plays a sealing role on the one hand, and can assist in supporting and positioning the multiple metal rods 200 on the other hand. It is easy to understand that an isolation member 40 can be provided near the protrusion 102 and at the opening 111 to prevent the heat exchange fluid from leaking into the air gap 21 and the rotor assembly 20. The above structures such as the opening 111, the protrusion 102 and the groove 110 can be made by stacking stacked sheets of different shapes. Therefore, the stack of stacked sheets 100 can be roughly insulated.

[0045] A plurality of metal rods 200 may be arranged within the slot 110. The metal rods 200 may be made of a conductive metal, such as copper, a copper alloy, aluminum, an aluminum alloy, silver, a silver alloy, or the like. For example, the plurality of metal rods 200 may be stacked together in the radial direction RR. In one embodiment, the metal rods 200 may be fitted into the slot 110 through an opening at at least one end of the slot 110 in the axial direction AA. In one embodiment, the plurality of metal rods 200 may be stacked together, and the outer surface of the metal rods 200 may be adjacent to the inner surface of the slot 110. In one embodiment, an insulating material, such as insulating paper 103, may be provided between the inner surface of the slot 110 and the outer surface of the metal rods 200. Figure 1 The approximate position of the insulating paper 103 is schematically shown by the dotted line. In one embodiment, the insulating paper 103 can be arranged around the periphery of all the metal rods 200. Figure 1 The middle insulating paper 103 is shown with a discontinuous dotted line, but it is easy to understand that this is for clearly showing the position of the insulating paper 103. The insulating paper 103 can actually be a continuous structure and constructed to be solid.

[0046] Figure 2 and Figure 3 The metal rods 200 are shown arranged in a row in the radial direction RR. However, the present application is not limited to the illustrated embodiment. In practice, multiple rows of metal rods 200 may be arranged in the radial direction RR, and the metal rods 200 in each row may be arranged side by side and placed in the slot 110. In addition, as shown in FIG. Figure 2 and Figure 3 As shown in FIG, multiple slots 110 may be arranged along the circumferential direction CC, and metal bars 200 may be arranged in at least a portion of the slots 110. The metal bars 200 may be connected in any suitable manner within the motor 1, including but not limited to series connection, parallel connection, etc., to form a current path.

[0047] The cross-sectional shape of the metal rod 200 as viewed in the axial direction AA can be one of the following: a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof. The cross-sectional shapes of the multiple metal rods 200 can be substantially the same or different. The cross-sectional shape of the metal rod 200 is selected to fill the cross-sectional area of ​​the slot 110 as much as possible. In the illustrated embodiment, the cross-sectional shape of the metal rod 200 can be configured as a substantially rounded rectangle, and the cross-sectional shape of the multiple metal rods 200 is substantially the same. The individual metal rods 200 can be stacked together along the radial direction RR, and at least a portion of the outer surface of the metal rods 200 can be positioned adjacent to each other.

[0048] At least some of the metal bars 200 may each include one or more recesses 210. The recesses 210 may be located between adjacent metal bars 200, or between an outer surface of the metal bar 200 (any outer surface facing the slot 110) and an inner surface of the slot 110, or provided at a corner of the cross-section of the metal bar 200 perpendicular to its length, for example, at a corner of a rectangular profile and between the metal bar 200 and the inner surface of the slot 110. Figure 1 In the embodiment of the present invention, each metal rod 200 includes a single recess 210. However, each metal rod 200 may also include multiple recesses 210, for example, multiple smaller recesses 210 are arranged on one surface. More specifically, the recesses 210 may be located at the surfaces of adjacent metal rods 200 facing each other, or the recesses 210 may be located at the surfaces of adjacent metal rods 200 facing each other. Figure 1 Between the outer surfaces of the plurality of metal rods 200 and the insulating paper 103. The cross-section of the recess 210 viewed in the axial direction AA can be one of the following shapes: an ellipse, a portion of an ellipse, a circle, a portion of a circle, a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof.

[0049] In one embodiment, a portion of the metal rod 200 may not include the recess 210. Figure 3 As shown, the metal bars 200 including the recesses 210 and the metal bars 200 not including the recesses 210 may be alternately arranged.

[0050] The recess 210 can be in fluid communication with the cavity 50, the fluid inlet 31, and the fluid outlet 32, thereby establishing a fluid channel that passes through the metal rod 200. A heat exchange fluid can flow in the fluid channel and remove heat dissipated by the metal rod 200. In one embodiment, the fluid inlet 31 and the fluid outlet 32 ​​can be located on the housing 30. The housing 30 and the isolation member 40 can surround the cavity 50 for the heat exchange fluid, and the fluid inlet and the fluid outlet can be connected to the cavity 50. In one embodiment, the stator assembly 10 is disposed within the cavity 50. In one embodiment, the periphery of the fluid channel can include sealing measures or sealing components to prevent the heat exchange fluid from leaking out of the fluid channel.

[0051] In one embodiment, the heat exchange fluid may be cooling oil or coolant. In one embodiment, the heat exchange fluid may be deionized water. For the heat exchange fluid, they may enter the cavity 50 at one end of the motor 1 from the fluid inlet 31, then flow through the recess 210, exchange heat with the stator assembly 10, and finally reach the cavity 50 at the other end of the motor 1, and leave from the fluid outlet 32. In one embodiment, the cavity 100 and the recess 210 are constructed to be linear, for example, extending along the axial direction AA. Such an arrangement not only increases the flow rate of the heat exchange fluid, but also helps to reduce the pressure required for the heat exchange fluid to flow, thereby reducing the pumping requirements of the cooling system, and reducing the manufacturing cost and power consumption of the pump and the entire system.

[0052] In one embodiment, the outer surface of the metal rod 200 may include an insulating layer 201. The insulating layer 201 may have a relatively thin thickness, for example, 0.1 mm. The insulating layer 201 may cover the outer surface of the metal rod 200, for example, covering all outer surfaces of the metal rod 200 outside the recess 210. In one embodiment, at least a portion of the recess 210 is covered by the insulating layer. In one embodiment, at least a portion of the recess 210 (for example, the metal rod 200 at least a portion of the inner surface of the recess 210) is exposed. In one embodiment, the portion of the recess 210 of the metal rod 200 facing the adjacent metal rod 200 may be exposed. In this case, the design of the metal rod 200 should take creepage distance into consideration, ensuring that the exposed metal portions of adjacent metal rods 200 are spaced sufficiently apart to ensure minimum electrical clearance, thereby achieving sufficient insulation performance and preventing leakage or short circuits.

[0053] The thickness of the insulating layer within recess 210 can be the same as or different from the thickness of the insulating layer on the rest of metal rod 200. For ease of manufacturing and precision, the thickness of the insulating layer within recess 210 can be smaller than that of the insulating layer on the rest of metal rod 200. The insulating layer can be formed using a process such as painting. The exposed portion of metal rod 200 can improve heat transfer efficiency, thereby accelerating heat transfer from metal rod 200 to the heat exchange fluid.

[0054] The stator assembly and motor of the present application have the advantages of being simple, reliable, easy to implement, and convenient to use. Through the arrangement of the fluid channel, the insulating layer, and the recess, the heat in the stator assembly of the present application can be directly transferred to the heat exchange fluid, achieving direct in-slot cooling, providing good heat dissipation capabilities, and improving the operational reliability and efficiency of the motor. In addition, the flow channel setting makes the pressure requirement of the heat exchange fluid smaller and the flow speed faster, thereby reducing the pumping requirements and reducing the cost of the entire liquid cooling system. Furthermore, the improvement of the metal rod in the present application is easy to process, and the other components of the stator assembly are well compatible with the existing motor manufacturing process and have good compatibility with the production line.

[0055] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to practice the present application, including making and using any device or system, selecting suitable materials, and using any combined methods. The scope of the present application is defined by the claimed technical solution and includes other examples that occur to those skilled in the art. As long as such other examples include structural elements that are not different from the literal language of the claimed technical solution, or such other examples include equivalent structural elements that are not substantially different from the literal language of the claimed technical solution, such other examples should be deemed to be within the scope of protection determined by the claimed technical solution.

Claims

1. A stator assembly, characterized in that: include: a plurality of stacking sheets (100) stacked together and surrounding the slot (110); as well as a plurality of metal rods (200) disposed within the slot (110) and positioned adjacent to each other; At least some of the plurality of metal rods (200) include one or more recesses (210), and the recesses (210) extend along the length direction of the metal rods (200) to form fluid channels running through the stator assembly (10).

2. The stator assembly according to claim 1, characterized in that The recess (210) is provided at one or more of the following locations: between adjacent metal bars (200), between the metal bar (200) and the inner surface of the groove (110), and at a corner of a cross-sectional profile of the metal bar (200).

3. The stator assembly according to claim 1, characterized in that The recess (210) is in fluid communication with the fluid inlet (31) and the fluid outlet (32).

4. The stator assembly according to claim 1, characterized in that The groove (110) is configured to have a cross-sectional profile of one of the following: a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof.

5. The stator assembly according to claim 1, characterized in that The metal rod (200) is configured to have a cross-sectional profile of one of the following: a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof.

6. The stator assembly according to claim 5, characterized in that The recess (210) is configured to have a cross-sectional profile of one of the following: an ellipse, a portion of an ellipse, a circle, a portion of a circle, a rounded rectangle, a rectangle, a trapezoid, a triangle, a regular pentagon, a regular hexagon, or a combination thereof.

7. The stator assembly according to claim 1, characterized in that The groove (110) has openings at both ends of the stacked sheet (100) along the axial direction (AA).

8. The stator assembly according to claim 7, characterized in that The slot (110) has an opening at the radial inner surface of the stacking plate (100) along the radial direction (RR); the stacking plate (100) includes a protrusion (102), which is located near the radially inward opening (111) of the slot (110), and the protrusion (102) is configured to support a plurality of metal rods (200).

9. The stator assembly according to any one of claims 1 to 8, characterized in that: The plurality of stacked sheets (100) are stacked together along the axial direction (AA) to form a slot (110) extending along the axial direction (AA); The length direction of the metal rod (200) is parallel to the axial direction (AA), and the plurality of metal rods (200) are stacked together along the radial direction (RR) and / or the circumferential direction (CC).

10. The stator assembly according to any one of claims 1 to 8, characterized in that: The outer surface of the metal rod (200) except the recess (210) has an insulating layer (201), and the inner surface (211) of the recess (210) is at least partially exposed.

11. The stator assembly according to claim 10, characterized in that The portions of the metal rod (200) that are opposite to the recesses (210) of the adjacent metal rods are at least partially exposed, and the distance between the exposed portions is set to provide insulation performance.

12. The stator assembly according to any one of claims 1 to 8, characterized in that: The entire outer surface of the metal rod (200) has an insulating layer (201), wherein the thickness of the insulating layer at the recess (210) is the same as or different from the thickness of the insulating layer at other parts of the metal rod (200) except the recess (210).

13. The stator assembly according to any one of claims 1 to 8, characterized in that: The inner surface of the groove (110) is smooth, or the inner surface of the groove (110) has a continuous sawtooth structure, so that the plurality of metal rods (200) are respectively supported and positioned by the sawtooth structure.

14. The stator assembly according to any one of claims 1 to 8, characterized in that: The invention also includes insulating paper (103) arranged between the inner surface of the slot (110) and the outer surface of the metal rod (200).

15. The stator assembly according to any one of claims 1 to 8, characterized in that: The fluid channel is used for heat exchange and for circulating an insulating medium for cooling the stator assembly.

16. The stator assembly according to any one of claims 1 to 8, characterized in that: A plurality of columns of metal bars (200) are stacked along a radial direction (RR), and the metal bars (200) of each column are arranged side by side within the slot (110).

17. The stator assembly according to any one of claims 1 to 8, characterized in that: At least some of the metal bars (200) do not include recesses (210), and in the same column of metal bars (200), metal bars (200) including recesses (210) and metal bars (200) not including recesses (210) are arranged alternately.

18. The stator assembly according to any one of claims 1 to 8, characterized in that: include: A plurality of slots (110) are arranged along a circumferential direction (CC), and the metal rod (200) is disposed in at least a portion of the plurality of slots (110).

19. A motor, characterized in that: include: The stator assembly (10) according to any one of claims 1 to 18; a rotor assembly (20) disposed adjacent to the stator assembly (10), with an air barrier (40) disposed between the stator assembly (10) and the rotor assembly (20); and A housing (30) accommodates the stator assembly (10) and the rotor assembly (20) and is attached to the stator assembly (10).

20. The motor according to claim 19, characterized in that The housing (30) and the isolating member (40) surround a cavity (50), a fluid inlet (31) and a fluid outlet (32) are arranged on the housing (30) and connected to the cavity (50), wherein the stator assembly (10) is arranged within the cavity (50), and a heat exchange fluid enters the motor (1) through the fluid inlet (31), flows through the cavity (50) at one end of the motor (1) near the fluid inlet (31), the groove (110), and the cavity (50) at the other end of the motor near the fluid outlet (32), and is discharged through the fluid outlet (32).

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