Stator assembly, magnetic suspension bearing, motor, compressor and air conditioner

Abstract

The present application provides a stator assembly, a magnetic levitation bearing, an electric motor, a compressor and an air conditioner. The stator assembly includes at least two core modules (1) and a heat conduction structure (2). The at least two core modules (1) are arranged at intervals in the circumferential direction. The heat conduction structure (2) is located between two adjacent core modules (1). At least part of the heat conduction structure (2) is provided with a cooling channel (3), and the cooling channel (3) communicates with the central shaft hole (9) of the stator assembly. According to the stator assembly of the present application, effective heat dissipation of the magnetic levitation bearing can be achieved, while the stator structure of the magnetic levitation bearing is not damaged, ensuring the quality of the magnetic levitation bearing.

Description

Technical Field

[0001] The present application relates to the field of magnetic suspension technology, and in particular to a stator assembly, a magnetic suspension bearing, a motor, a compressor and an air conditioner. Background Art

[0002] Magnetic bearings are bearings that use electromagnetic force to support the rotor system to stably suspend and operate. Compared with traditional mechanical bearings, magnetic bearings have excellent characteristics such as no friction, no wear, no need for lubrication, high operating speed, long life and low maintenance cost. They have broad application prospects in high-speed transmission fields such as high-speed motors, high-speed electric spindles, and high-speed flywheel energy storage systems.

[0003] Magnetic bearings use controllable electromagnetic force to suspend the rotor in a magnetic field. The bearings have iron loss and copper loss, which causes the bearings to heat up. Overheating of the bearings will cause the rotor to expand due to heat, causing changes in the bearing structural parameters, affecting the bearing air gap, and affecting the mechanical strength of the silicon steel sheets of the rotor core. The current bearing cooling structure mainly opens holes in the bearing stator slots to directly cool the winding package. Although this solution alleviates the problem of heating, it is easy to damage the stator structure and affect the quality of the magnetic bearing. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a stator assembly, a magnetic bearing, a motor, a compressor and an air conditioner, which can effectively dissipate the heat of the magnetic bearing while avoiding damage to the stator structure of the magnetic bearing and ensuring the quality of the magnetic bearing.

[0005] In order to solve the above problems, the present application provides a stator assembly, including at least two core modules and a heat-conducting structure, wherein the at least two core modules are arranged at intervals along the circumferential direction, and the heat-conducting structure is located between two adjacent core modules to magnetically isolate the two adjacent core modules. A cooling channel is provided on at least part of the heat-conducting structure, and the cooling channel is connected to the central axis hole of the stator assembly.

[0006] Preferably, the core module comprises a yoke portion and a tooth portion, and the heat-conducting structure protrudes radially from an inner peripheral wall of the yoke portion.

[0007] Preferably, the heat-conducting structure is a heat-conducting plate, and the heat-conducting plate is located in the middle of adjacent teeth.

[0008] Preferably, tooth slots are formed between adjacent teeth, coils are wound in the tooth slots, the heat conducting structure is located between adjacent coils, the heat conducting structure extends radially along the core module, and the top of the heat conducting structure extending toward the central axis hole is located radially inside the coil.

[0009] Preferably, the top height of the heat conducting structure relative to the yoke is the same as the radial height of the tooth portion.

[0010] Preferably, at least one side of the heat-conducting structure is provided with a guide hole connected to the tooth groove, the guide hole is connected to the cooling channel, and the guide hole is located radially outside the coil.

[0011] Preferably, a top height of the heat conducting structure relative to the yoke is higher than a radial height of the tooth portion.

[0012] Preferably, a single heat-conducting structure is provided with a cooling channel, which is located in the axial middle position of the heat-conducting structure; or, a single heat-conducting structure is provided with at least two cooling channels, which are spaced apart along the axial direction of the core module.

[0013] Preferably, the heat-conducting structure is made of magnetic-insulating material.

[0014] Preferably, the stator assembly further comprises a heat-conducting sleeve, which is disposed on the periphery of the core module and the heat-conducting structure and fixes the core module.

[0015] Preferably, the heat-conducting sleeve and the heat-conducting structure are integrally formed.

[0016] Preferably, the cooling channel penetrates the heat conductive sleeve in radial direction.

[0017] Preferably, an annular flow channel is provided on the outer periphery of the heat-conducting sleeve, and each cooling channel is communicated with the annular flow channel.

[0018] Preferably, the heat-conducting structure is made of a material that is a good thermal conductor.

[0019] Preferably, the heat-conducting sleeve is made of magnetic-insulating material.

[0020] Preferably, a single core module includes two teeth, and the circumferential widths of the two teeth are the same; or, a single core module includes three teeth, and the circumferential width of the middle tooth is equal to the sum of the circumferential widths of the teeth on both sides.

[0021] Preferably, the stator assembly has 8 poles, 12 poles or 16 poles.

[0022] According to another aspect of the present application, a magnetic bearing is provided, comprising a stator assembly and a bearing rotor. The stator assembly is the above-mentioned stator assembly, and the bearing rotor is arranged in a central axis hole of the stator assembly.

[0023] According to another aspect of the present application, a motor is provided, including a stator assembly and a bearing rotor. The stator assembly is the above-mentioned stator assembly, and the bearing rotor is arranged in a central axis hole of the stator assembly.

[0024] Preferably, the motor also includes a front bearing housing, a rear bearing housing and a casing, the front bearing housing and the rear bearing housing are respectively provided with stator assemblies, the casing is sleeved outside the front bearing housing and the rear bearing housing, and the casing, the front bearing housing and the rear bearing housing are respectively provided with fluid channels, and the cooling medium enters the cooling channel through the fluid channels.

[0025] According to another aspect of the present application, a compressor is provided, comprising the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0026] According to another aspect of the present application, an air conditioner is provided, comprising the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0027] The stator assembly provided by the present application includes at least two core modules and a heat-conducting structure, at least two core modules are arranged at intervals along the circumferential direction, the heat-conducting structure is located between two adjacent core modules, the two adjacent core modules are magnetically isolated, and at least part of the heat-conducting structure is provided with a cooling channel, which is connected to the central axis hole of the stator assembly. In the stator assembly, at least two core modules are separately arranged to form the stator core, so that the modularization of the bearing stator core can be realized, which is convenient for production, maintenance and replacement, and reduces the cost of bearings. The modular core module is more convenient to realize winding, reduces the difficulty of winding, and improves the winding efficiency. The cooling channel is opened on the heat-conducting structure instead of on the core module, which can not only realize the effective heat dissipation of the magnetic suspension bearing, but also avoid the problems of cracking and warping of the core laminations caused by drilling holes in the stator core, effectively protect the stator core structure, and ensure the quality of the magnetic suspension bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the exploded structure of a magnetic bearing according to one embodiment of the present application;

[0029] Figure 2 A schematic cross-sectional view of a magnetic bearing according to an embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the exploded structure of a magnetic bearing according to an embodiment of the present application;

[0031] Figure 4 A schematic cross-sectional view of a magnetic bearing according to an embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the exploded structure of a magnetic bearing according to one embodiment of the present application;

[0033] Figure 6 A schematic cross-sectional view of a magnetic bearing according to an embodiment of the present application;

[0034] Figure 7This is a schematic diagram of the exploded structure of a magnetic bearing according to one embodiment of the present application;

[0035] Figure 8 A schematic cross-sectional view of a magnetic bearing according to an embodiment of the present application;

[0036] Fig. 9 This is a schematic diagram of the exploded structure of a magnetic bearing according to one embodiment of the present application;

[0037] Fig.10 A schematic cross-sectional view of a magnetic bearing according to an embodiment of the present application;

[0038] Fig.11 This is a schematic diagram of the exploded structure of a magnetic bearing according to one embodiment of the present application;

[0039] Fig.12 A schematic cross-sectional view of a magnetic bearing according to an embodiment of the present application;

[0040] Fig.13 This is a schematic diagram of the exploded structure of a magnetic bearing according to one embodiment of the present application;

[0041] Fig.14 A schematic cross-sectional view of a magnetic bearing according to an embodiment of the present application;

[0042] Fig.15 This is a schematic cross-sectional structural diagram of a motor according to an embodiment of the present application.

[0043] The reference numerals are:

[0044] 1. Core module; 2. Heat-conducting structure; 3. Cooling channel; 4. Yoke; 5. Tooth; 6. Coil; 7. Heat-conducting sleeve; 8. Annular flow channel; 9. Center axis hole; 10. Tooth groove; 11. Front cover; 12. Displacement sensor; 13. Radial protection; 14. Front bearing housing; 15. Front magnetic bearing; 16. Casing; 17. Motor stator; 18. Rear magnetic bearing; 19. Fluid channel; 20. Rear bearing housing; 21. Rear cover; 22. Bearing rotor; 23. Guide hole. DETAILED DESCRIPTION

[0045] See also Figures 1 to 15 As shown, according to an embodiment of the present application, the stator assembly includes at least two core modules 1 and a heat-conducting structure 2, at least two core modules 1 are arranged at intervals along the circumferential direction, the heat-conducting structure 2 is located between two adjacent core modules 1, and magnetic isolation is performed on the two adjacent core modules 1, and a cooling channel 3 is provided on at least a portion of the heat-conducting structure 2, and the cooling channel 3 is connected to the central axis hole 9 of the stator assembly.

[0046] In the stator assembly, at least two core modules 1 are separately arranged to form the stator core, so the bearing stator core can be modularized, which is convenient for production, maintenance and replacement, and reduces the cost of bearings. The modular core module 1 is more convenient for winding, reduces the difficulty of winding, and improves the winding efficiency. The cooling channel 3 is opened on the heat-conducting structure 2 instead of on the core module 1, which can not only achieve effective heat dissipation of the magnetic suspension bearing, but also avoid the problems of cracking and warping of the core laminations caused by drilling holes on the stator core, effectively protecting the stator core structure and ensuring the quality of the magnetic suspension bearing.

[0047] In one embodiment, the heat conductive structure 2 is made of magnetic isolation material. The iron core modules 1 are magnetically isolated by the heat conductive structure 2, so that each iron core module 1 is a separate magnetic flux line loop. The heat conductive structure 2 is used to separate the magnetic flux line loops, which can avoid magnetic coupling and magnetic leakage in the bearing and improve the magnetic performance of the magnetic suspension bearing.

[0048] In one embodiment, the core module 1 includes a yoke 4 and a tooth portion 5, and the heat-conducting structure 2 radially protrudes from the inner peripheral wall of the yoke 4. In this embodiment, the heat-conducting structure 2 radially protrudes from the inner peripheral wall of the yoke 4, so that the outlet of the cooling channel 3 radially connected to the central axis hole 9 can be closer to the bearing rotor 22, which can shorten the flow path of the cooling medium, reduce the blocking effect of the coil 6 on the flow of the cooling medium, so that the cooling medium can reach the bearing rotor 22 more effectively, form a more effective cooling effect on the bearing rotor 22, and improve the cooling effect on the magnetic suspension bearing.

[0049] In one embodiment, the heat-conducting structure 2 is a heat-conducting plate, which is located in the middle of adjacent teeth 5, and can more effectively reduce the blocking effect of the coil 6 on the flow of the cooling medium and improve the flow efficiency of the cooling medium.

[0050] In one embodiment, tooth slots 10 are formed between adjacent tooth portions 5, coils 6 are wound in the tooth slots 10, the heat-conducting structure 2 is located between adjacent coils 6, the heat-conducting structure 2 extends in the radial direction of the core module 1, and the top of the heat-conducting structure 2 extending toward the central axis hole 9 is located radially inside the coil 6. In this structure, the heat-conducting structure 2 passes through the middle of two adjacent coils 6, and the outlet of the cooling channel 3 is located radially inside the coil 6, so the coil 6 is located outside the flow path of the cooling medium, and will not cause any obstruction to the flow of the cooling medium, so that the cooling medium can fully reach the surface of the bearing rotor 22, effectively cool the bearing rotor 22, and improve the cooling effect.

[0051] As a preferred embodiment, the top height of the heat-conducting structure 2 relative to the yoke 4 is the same as the radial height of the tooth 5, which will not cause adverse effects on the stator-rotor gap, but can also minimize the distance between the outlet of the cooling channel 3 and the surface of the bearing rotor 22, thereby improving the cooling effect.

[0052] See also Figures 7 to 10 As shown, in one embodiment, at least one side of the heat-conducting structure 2 is provided with a guide hole 23 connected to the tooth slot 10, the guide hole 23 is connected to the cooling channel 3, and the guide hole 23 is located on the radial outer side of the coil 6. In this embodiment, by providing the guide hole 23 connected to the cooling channel 3 on the radial inner side of the coil 6, when the cooling medium flows along the cooling channel 3, a part of the cooling medium will flow from the guide hole 23 to the radial outer side of the coil 6, effectively cooling the coil 6 and the tooth portion 5, and another part of the cooling medium will flow from the outlet of the cooling channel 3 to the surface of the bearing rotor 22, effectively cooling the bearing rotor 22, thereby achieving a more effective cooling effect on both the stator and the rotor. As a preferred embodiment, the guide holes 23 are respectively provided on both sides of the heat-conducting structure 2, and the number of the guide holes 23 is at least two, so that the cooling medium can be supplied from both sides of the heat-conducting structure 2 at the same time, and the coil 6 can be cooled more effectively.

[0053] See also Figure 11 to Figure 12 As shown, in one embodiment, the top height of the heat-conducting structure 2 relative to the yoke 4 is higher than the radial height of the tooth 5, so that the outlet of the cooling channel 3 on the heat-conducting structure 2 can be closer to the bearing rotor 22, making it easier to transport the cooling medium to the surface of the bearing rotor 22 to cool the bearing rotor 22. In addition, since the heat-conducting structure 2 protrudes radially from the inner side of the tooth 5, when the bearing rotor 22 falls abnormally, the heat-conducting structure 2 can play a role in radially protecting the magnetic suspension bearing to avoid damage to the bearing stator. Since the heat-conducting structure 2 itself can be disassembled and replaced, even if the heat-conducting structure 2 is damaged, it can be quickly replaced, which can reduce the replacement and maintenance costs.

[0054] In one embodiment, a single heat-conducting structure 2 is provided with a cooling channel 3, which is located in the axial middle position of the heat-conducting structure 2, and can improve the distribution uniformity of the cooling medium in the cooling channel 3 when it flows out, thereby improving the cooling uniformity.

[0055] In one embodiment, at least two cooling channels 3 are provided on a single heat-conducting structure 2. The at least two cooling channels 3 are spaced apart along the axial direction of the core module 1, which can provide more cooling medium for the bearing rotor 22 and further improve the cooling effect.

[0056] In one embodiment, the stator assembly further includes a heat-conducting sleeve 7, which is sleeved on the outer periphery of the core module 1 and the heat-conducting structure 2, and fixes the core module 1. Since the stator core is made of silicon steel sheet laminations, it is difficult to ensure the outer diameter accuracy, resulting in low assembly accuracy of the stator core. In this embodiment, since the heat-conducting sleeve 7 is sleeved on the outer periphery of the core module 1, compared with the stator core, the outer diameter of the heat-conducting sleeve 7 is easy to process and the processing accuracy is easy to ensure, so the bearing assembly accuracy can be effectively improved.

[0057] In one embodiment, the heat-conducting sleeve 7 is made of magnetic isolation material.

[0058] In addition, the heat-conducting sleeve 7 is sleeved on the outer periphery of the core module 1 and can be used in conjunction with the heat-conducting structure 2 to not only separate adjacent core modules 1, but also separate the stator core from the bearing housing, thereby effectively preventing the bearing magnetic field from leaking to the bearing housing and reducing or avoiding magnetic leakage.

[0059] In one embodiment, the thermally conductive sleeve 7 and the thermally conductive plate of the thermally conductive structure 2 are integrally formed, which can ensure that the thermally conductive sleeve 7 and the thermally conductive plate have better structural strength, and can make the overall magnetic isolation effect of the structure formed by the thermally conductive sleeve 7 and the thermally conductive plate better and less prone to magnetic leakage.

[0060] In one embodiment, the cooling channel 3 penetrates the heat-conducting sleeve 7 in the radial direction, so that the cooling channel 3 on the heat-conducting structure 2 can be supplied with cooling medium through the cooling channel 3 on the heat-conducting sleeve 7, thereby facilitating the delivery of the cooling medium.

[0061] In other embodiments, a supply channel may be added from the axial direction of the heat-conducting structure 2 , and the supply channel may be connected to the cooling channel 3 . The magnetic bearing may supply cooling medium to the cooling channel 3 on the heat-conducting structure 2 through the supply channel.

[0062] In one embodiment, an annular flow channel 8 is provided on the outer periphery of the heat-conducting sleeve 7, and each cooling channel 3 is connected to the annular flow channel 8. In this embodiment, since each cooling channel 3 is connected to the annular flow channel 8, when supplying the cooling medium, it is only necessary to supply the cooling medium into the annular flow channel 8, and the cooling medium can be evenly distributed through the annular flow channel 8, so that the structure is simpler and the supply of the cooling medium is more convenient.

[0063] In one embodiment, the heat-conducting structure 2 is made of a good thermal conductor material, and can use the heat-conducting structure 2 to conduct heat, so that the cooling medium flowing through the cooling channel 3 can also effectively dissipate the heat of the core module 1 when flowing through the heat-conducting structure 2, thereby further improving the cooling effect of the magnetic bearing.

[0064] In one embodiment, a single core module 1 includes two tooth portions 5 , and the circumferential widths of the two tooth portions 5 are the same.

[0065] In one embodiment, a single core module 1 includes three teeth 5 , and the circumferential width of the middle tooth 5 is equal to the sum of the circumferential widths of the teeth 5 on both sides.

[0066] The stator assembly is 8-pole, 12-pole or 16-pole.

[0067] The division method of the core module 1 needs to match the number of poles of the stator assembly. For example, when the number of poles of the stator assembly is an even number, the number of teeth contained in a single core module 1 should be a multiple of 2. When the number of poles of the stator assembly is a multiple of 3, the number of teeth contained in a single core module 1 should be a multiple of 3. The stator assembly is designed in this way, so that the stator assembly of the embodiment of the present application can be adapted to all magnetic bearings that can adopt a block structure, and the structure of the heat-conducting structure 2 can be adjusted according to the block structure, and only needs to be located between two adjacent blocks.

[0068] See also Figure 3 and Figure 4 As shown, in this embodiment, the stator assembly is an 8-pole structure, the bearing rotor 22 and the stator core are stacked by silicon steel sheets, the stator core is composed of multiple modular cores, the stator core is fixed in the heat-conducting sleeve 7, and the core modules 1 are spaced by the heat-conducting plate, and the connection methods between them include but are not limited to screws, bolts, pin connections, interference fit thermal assembly, welding, adhesive application, etc. The heat-conducting sleeve 7 is provided with an annular flow channel 8, and the heat-conducting plate is provided with a radially extending cooling channel 3. The annular flow channel 8 and the cooling channel 3 are interconnected and used to pass high-pressure cooling airflow to directly cool the bearing rotor 22; the flow channel position is not limited to the position shown in the figure, and the radially extending cooling channel 3 can be located between the two core modules 1.

[0069] See also Figure 5 and Figure 6 As shown, in this embodiment, the stator assembly is a 16-pole structure, the bearing rotor 22 and the stator core are stacked by silicon steel sheets, the stator core is composed of multiple modular cores, the stator core is fixed in the heat-conducting sleeve 7, and each core module 1 is spaced by a heat-conducting plate, and the connection methods between them include but are not limited to screws, bolts, pin connections, interference fit thermal assembly, welding, adhesive application, etc. The heat-conducting sleeve 7 is provided with an annular flow channel 8, and the heat-conducting plate is provided with a radially extending cooling channel 3. The annular flow channel 8 and the cooling channel 3 are interconnected and used to pass a high-pressure cooling airflow to directly cool the bearing rotor 22; the flow channel position is not limited to the position shown in the figure, and the radially extending cooling channel 3 can be located between the two core modules 1.

[0070] The above-mentioned heat-conducting structure 2 and heat-conducting sleeve 7 are made of, for example, aluminum, copper, stainless steel or other magnetically isolating metal alloys.

[0071] According to an embodiment of the present application, the magnetic bearing includes a stator assembly and a bearing rotor 22 . The stator assembly is the above-mentioned stator assembly, and the bearing rotor 22 is disposed in a central axis hole 9 of the stator assembly.

[0072] See also Figure 7 As shown, according to an embodiment of the present application, the motor includes a stator assembly and a bearing rotor 22 . The stator assembly is the above-mentioned stator assembly, and the bearing rotor 22 is disposed in a central axis hole 9 of the stator assembly.

[0073] In one embodiment, the motor further includes a front end cover 11, a displacement sensor 12, a radial protection 13, a front bearing housing 14, a front magnetic bearing 15, a casing 16, a motor stator 17, a rear magnetic bearing 18, a fluid channel 19, a rear bearing housing 20 and a rear end cover 21. The front bearing housing 14 is provided with the front magnetic bearing 15, the rear bearing housing 20 is provided with the rear magnetic bearing 18, the casing 16 is sleeved outside the front bearing housing 14 and the rear bearing housing 20, and the casing 16, the front bearing housing 14 and the rear bearing housing 20 are respectively provided with fluid channels 19, and the cooling medium enters the cooling channel 3 through the fluid channel 19.

[0074] In this embodiment, at least one of the front magnetic bearing 15 and the rear magnetic bearing 18 adopts the above-mentioned magnetic bearing.

[0075] When the motor is running, the magnetic bearing is powered on, and the bearing rotor 22 is suspended due to the controllable electromagnetic force of the magnetic bearing. The suspension force is generated by the magnetic field formed by multiple modular core modules 1. Multiple modular core modules 1 work independently and can be replaced independently when damaged. After power is turned on, a magnetic field is generated in the core module 1. Each core module 1 is separated by a heat-conducting sleeve 7 and a heat-conducting plate. The heat-conducting plate is used to isolate the magnetic coupling between the core modules 1, and the heat-conducting sleeve 7 is used to prevent the magnetic field of the bearing stator from leaking to the bearing housing. Due to iron loss, copper loss and other reasons, the bearing rotor 22 heats up, and a high-pressure cooling airflow (the gas can be air, nitrogen and other gases used for cooling) is passed through the fluid channel 19 on the casing 16 to directly cool the bearing rotor 22.

[0076] According to an embodiment of the present application, the compressor includes the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0077] According to an embodiment of the present application, an air conditioner includes the above-mentioned stator assembly or the above-mentioned magnetic bearing.

[0078] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0079] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A stator assembly, characterized in that, it includes at least two iron core modules (1) and a heat conduction structure (2). At least two of the iron core modules (1) are arranged at intervals in the circumferential direction. The heat conduction structure (2) is located between two adjacent iron core modules (1). At least part of the heat conduction structure (2) is provided with a cooling channel (3), and the cooling channel (3) communicates with the central axis hole (9) of the stator assembly; the iron core module (1) includes a yoke portion (4) and a tooth portion (5), and the heat conduction structure (2) protrudes radially from the inner peripheral wall of the yoke portion (4); tooth slots (10) are formed between adjacent tooth portions (5), coils (6) are wound in the tooth slots (10), the heat conduction structure (2) is located between adjacent coils (6), the heat conduction structure (2) extends radially along the iron core module (1), and the top end of the heat conduction structure (2) extending towards the central axis hole (9) is located radially inside the coil (6); the outlet of the cooling channel (3) is located radially inside the coil (6).

2. The stator assembly according to claim 1, characterized in that, the heat conduction structure (2) is a heat conduction plate, and the heat conduction plate is located at the middle position between adjacent tooth portions (5).

3. The stator assembly according to claim 1, characterized in that, the top height of the heat conduction structure (2) relative to the yoke portion (4) is the same as the radial height of the tooth portion (5).

4. The stator assembly according to claim 1, characterized in that, at least one side of the heat conduction structure is provided with a diversion hole (23) communicating with the tooth slot (10), the diversion hole (23) communicates with the cooling channel (3), and the diversion hole (23) is located radially outside the coil (6).

5. The stator assembly according to claim 1, characterized in that, the top height of the heat conduction structure (2) relative to the yoke portion (4) is higher than the radial height of the tooth portion (5).

6. The stator assembly according to claim 1, characterized in that, one cooling channel (3) is provided on a single heat conduction structure (2), and the cooling channel (3) is located at the axial middle position of the heat conduction structure (2); or, at least two cooling channels (3) are provided on a single heat conduction structure (2), and at least two cooling channels (3) are arranged at intervals along the axial direction of the iron core module (1).

7. The stator assembly according to claim 1, characterized in that, the heat conduction structure (2) is made of a magnetic insulation material.

8. The stator assembly according to any one of claims 1 to 7, characterized in that, the stator assembly further includes a heat conduction sleeve (7), the heat conduction sleeve (7) is sleeved on the outer periphery of the iron core module (1) and the heat conduction structure (2), and fixes the iron core module (1).

9. The stator assembly according to claim 8, characterized in that, the heat conduction sleeve (7) is integrally formed with the heat conduction structure (2).

10. The stator assembly according to claim 9, characterized in that, the cooling channel (3) penetrates the heat conduction sleeve (7) radially.

11. The stator assembly according to claim 10, characterized in that, an annular flow channel (8) is provided on the outer periphery of the heat conduction sleeve (7), and each of the cooling channels (3) communicates with the annular flow channel (8).

12. The stator assembly according to claim 1, characterized in that, the heat conduction structure (2) is made of a material with good thermal conductivity.

13. The stator assembly according to claim 8, characterized in that, the heat conduction sleeve (7) is made of a magnetic isolation material.

14. The stator assembly according to any one of claims 1 to 5, characterized in that, a single core module (1) includes two of the tooth portions (5), and the circumferential widths of the two tooth portions (5) are the same; or, a single core module (1) includes three of the tooth portions (5), and the circumferential width of the middle tooth portion (5) is equal to the sum of the circumferential widths of the tooth portions (5) on both sides.

15. The stator assembly according to any one of claims 1 to 7, characterized in that, the stator assembly is 8-pole, 12-pole or 16-pole.

16. A magnetic levitation bearing, comprising a stator assembly and a bearing rotor (22), characterized in that, the stator assembly is the stator assembly according to any one of claims 1 to 15, and the bearing rotor (22) is arranged in the central shaft hole (9) of the stator assembly.

17. An electric motor, comprising a stator assembly and a bearing rotor (22), characterized in that, the stator assembly is the stator assembly according to any one of claims 1 to 15, and the bearing rotor (22) is arranged in the central shaft hole (9) of the stator assembly.

18. The electric motor according to claim 17, characterized in that, the electric motor further includes a front bearing housing (14), a rear bearing housing (20) and a machine housing (16), the stator assemblies are respectively arranged in the front bearing housing (14) and the rear bearing housing (20), the machine housing (16) is sleeved outside the front bearing housing (14) and the rear bearing housing (20), and fluid channels (19) are respectively arranged on the machine housing (16), the front bearing housing (14) and the rear bearing housing (20), and a cooling medium enters the cooling channels (3) through the fluid channels (19).

19. A compressor, characterized in that, it includes the stator assembly according to any one of claims 1 to 15 or the magnetic levitation bearing according to claim 16.

20. An air conditioner, characterized in that, it includes the stator assembly according to any one of claims 1 to 15 or the magnetic levitation bearing according to claim 16.

Images