Stator assembly, electric machine and vehicle

Abstract

This application relates to a stator assembly, a motor, and a vehicle. The stator assembly includes a support plate, stator teeth, and windings. The support plate has multiple mounting holes spaced apart circumferentially. Multiple stator teeth pass through the mounting holes and connect to the support plate. The windings include multiple coils, each coil being sleeved on one of the stator teeth. A cooling oil channel is defined between adjacent coils circumferentially. By defining a cooling oil channel between adjacent coils circumferentially, this application allows cooling oil to flow through the channel, thereby removing heat from the opposing surfaces of the adjacent coils, reducing coil temperature, and improving the heat dissipation efficiency of the stator assembly. This improves the operational reliability of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more particularly to a stator assembly, a motor, and a vehicle. Background Technology

[0002] An axial flux motor is a type of motor in which the magnetic field direction is parallel to the motor's axis. An axial flux motor mainly consists of a housing, a stator assembly fixed within the housing, and two rotor assemblies rotatably mounted within the housing. The two rotor assemblies are located at the axial ends of the stator assembly, forming an air gap between them. The stator assembly includes a frame, stator teeth (also called stator core) mounted on the frame, and stator windings wound around the stator teeth.

[0003] When the motor is operating, three-phase alternating current is supplied to the stator windings to generate a stator magnetic field on the stator assembly. The permanent magnets in the rotor assembly possess a constant rotor magnetic field. The current in the stator windings interacts with the constant rotor magnetic field, generating an Ampere force, which in turn creates torque on the rotor. Because the stator magnetic field changes periodically with the three-phase alternating current, the direction of the torque on the rotor assembly continuously changes, causing the rotor assembly to rotate continuously.

[0004] Because the stator windings generate heat when current flows through them, if the stator assembly is not cooled in time, the temperature of the stator assembly will continue to rise. This will accelerate the aging of the motor's insulation materials and lead to problems such as increased resistance of the stator windings, reduced permeability of the stator teeth, and increased iron losses, thereby affecting the motor's operational reliability. Summary of the Invention

[0005] This application provides a stator assembly that improves the heat dissipation efficiency of the stator assembly, thereby at least solving the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, a stator assembly is provided, the stator assembly including a support plate, stator teeth and windings; the support plate is provided with a plurality of mounting holes, the plurality of mounting holes being spaced apart along the circumference of the support plate; there are a plurality of stator teeth, the plurality of stator teeth respectively passing through the plurality of mounting holes and connected to the support plate; the windings include a plurality of coils, the plurality of coils being respectively sleeved on the plurality of stator teeth; wherein, in the circumferential direction, a heat dissipation oil passage is defined between two adjacent coils.

[0007] Optionally, in the circumferential direction, the distance between two adjacent stator teeth is A, and the width of the heat dissipation oil passage is B, satisfying: 5%A≤B≤25%A.

[0008] Optionally, 10%A≤B≤20%A.

[0009] Optionally, in the circumferential direction, the included angle between the opposite faces of two adjacent coils is less than or equal to 5°.

[0010] Optionally, in the circumferential direction, the opposite faces of two adjacent coils are parallel to each other.

[0011] Optionally, the stator assembly also includes multiple toothed sleeves, which are respectively fitted onto multiple stator teeth. The toothed sleeves are connected to the support plate and are located between the adjacent stator teeth and the coil.

[0012] Optionally, the gear sleeve and the support plate are integrally formed; and / or, the inner circumferential surface of the gear sleeve is bonded to the outer circumferential surface of the stator tooth.

[0013] Optionally, both ends of the stator teeth are located outside the mounting holes, and there are two windings. The two windings are located on both sides of the support plate, with the coil of one winding sleeved on one end of the stator teeth and the coil of the other winding sleeved on the other end of the stator teeth.

[0014] Alternatively, the two windings are configured to be connected in parallel in the circuit.

[0015] Optionally, the stator tooth includes a main body and two end plates. The two ends of the main body are respectively connected to the two end plates. The main body passes through the mounting hole. The coil is located between the end plates and the support plate, and the end plates at least cover part of the end of the coil.

[0016] Optionally, the main body includes a first tooth and a second tooth extending in opposite directions. One end of the first tooth and one end of the second tooth are both inserted into the mounting hole, and the other ends of the first tooth and the second tooth are respectively connected to two end plates. The coil of one winding is sleeved on the first tooth, and the coil of the other winding is sleeved on the second tooth.

[0017] Optionally, a through hole is provided on the outer periphery of the support plate, the through hole being configured to engage with bolts to fix the support plate to the motor housing by means of bolts.

[0018] According to a second aspect of this application, an electric motor is provided, the electric motor including a housing, a rotor shaft, a rotor assembly and the aforementioned stator assembly, the stator assembly being installed inside the housing; the rotor shaft being rotatably installed inside the housing; the rotor assembly being sleeved on the rotor shaft and located at one or both ends of the stator assembly; wherein, the housing is filled with cooling oil.

[0019] According to a third aspect of this application, a vehicle is provided that includes the aforementioned motor.

[0020] In the stator assembly of this application embodiment, a cooling oil channel is defined between two adjacent coils in the circumferential direction, allowing cooling oil to flow through the channel. This removes heat from the opposing surfaces of the two adjacent coils, reducing the coil temperature and improving the heat dissipation efficiency of the stator assembly. This, in turn, improves the operational reliability of the motor.

[0021] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0024] Figure 1 This is a schematic diagram of the structure of the stator assembly provided in an exemplary embodiment of this disclosure;

[0025] Figure 2 This is a partial side view of a stator assembly provided in an exemplary embodiment of this disclosure;

[0026] Figure 3 This is a schematic diagram of the connection between the toothed sleeve and the support plate provided in an exemplary embodiment of this disclosure;

[0027] Figure 4 This is a schematic diagram of the stator teeth provided in an exemplary embodiment of this disclosure;

[0028] Figure 5 This is a schematic diagram of the structure of the motor provided in an exemplary embodiment of this disclosure.

[0029] Explanation of reference numerals in the attached figures:

[0030] 10-Stator assembly;

[0031] 11-Support plate; 111-Mounting hole; 112-Through hole;

[0032] 12-Stator tooth; 121-Main body; 1211-First tooth; 1212-Second tooth; 122-End plate;

[0033] 13 - Winding; 131 - Coil;

[0034] 14-Cooling oil passage;

[0035] 15-Gear sleeve;

[0036] 20-Motor; 21-Housing; 22-Rotor shaft; 23-Rotor assembly; 24-Air gap. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0038] The following combination Figures 1 to 5 The stator assembly 10, motor 20 and vehicle provided in the embodiments of this application will be described in detail.

[0039] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the stator assembly 10 provided in an exemplary embodiment of this disclosure. Figure 2 This is a partial side view of a stator assembly 10 provided in an exemplary embodiment of this disclosure. In a first aspect, embodiments of this application provide a stator assembly 10. The stator assembly 10 includes a support plate 11, stator teeth 12, and windings 13. The support plate 11 is provided with a plurality of mounting holes 111. The plurality of mounting holes 111 are spaced apart circumferentially along the support plate 11. There are a plurality of stator teeth 12. The plurality of stator teeth 12 are respectively disposed in the plurality of mounting holes 111 and connected to the support plate 11. The windings 13 include a plurality of coils 131. The plurality of coils 131 are respectively sleeved on the plurality of stator teeth 12. Wherein, in the circumferential direction, a heat dissipation oil passage 14 is defined between two adjacent coils 131.

[0040] It is understood that the stator teeth 12 are fixed to the support plate 11. Specifically, the stator teeth 12 can be fixed to the support plate 11 with glue or other fasteners.

[0041] It is understandable that the winding 13 can be wound on the stator teeth 12 in a distributed winding manner or in a centralized winding manner.

[0042] It can be understood that winding 13 includes three phase lines, namely phase A, phase B, and phase C. The coils 131 belonging to phase A are electrically connected as one unit, the coils 131 belonging to phase B are electrically connected as one unit, and the coils 131 belonging to phase C are electrically connected as one unit.

[0043] In this embodiment, by defining a cooling oil channel 14 between two adjacent coils 131 in the circumferential direction, cooling oil can flow through the cooling oil channel 14, thereby removing heat from the opposing surfaces of the two adjacent coils 131, reducing the temperature of the coils 131, and improving the heat dissipation efficiency of the stator assembly 10. This helps to improve the operational reliability of the motor 20.

[0044] Please see Figure 2 In some embodiments, the distance between two adjacent stator teeth 12 in the circumferential direction is A, and the width of the heat dissipation oil channel 14 is B, satisfying: 5%A≤B≤25%A.

[0045] It can be understood that the width B of the heat dissipation oil channel 14 is the distance between the outer peripheral surfaces of two adjacent coils 131 in the circumferential direction.

[0046] Exemplarily, the width dimension B of the cooling oil passage 14 includes, but is not limited to, 5% A, 5.8% A, 6.6% A, 7.4% A, 8.2% A, 9.0% A, 9.8% A, 10.6% A, 11.4% A, 12.2% A, 13.0% A, 13.8% A, 14.6% A, 15.4% A, 16.2% A, 17.0% A, 17.8% A, 18.6% A, 19.4% A, 20.2% A, 21.0% A, 21.8% A, 22.6% A, 23.4% A, 24.2% A, 25% A.

[0047] In this embodiment, the width B of the cooling oil channel 14 is limited. On the one hand, this avoids the cooling oil channel 14 being too narrow, thus ensuring sufficient oil flow between adjacent coils 131 and improving the heat dissipation efficiency of the coils 131, thereby enhancing the operational reliability of the motor 20. On the other hand, it avoids the cooling oil channel 14 being too wide, which would result in a smaller coil 131. This allows the coil 131 to have a larger size, increasing the magnetic flux and thus the magnetic field strength. This helps improve the torque and speed performance of the motor 20, giving it better power output.

[0048] In some embodiments, 10%A ≤ B ≤ 20%A.

[0049] Exemplarily, the width dimension B of the heat dissipation oil passage 14 includes but is not limited to 10%A, 10.3%A, 10.7%A, 11.0%A, 11.3%A, 11.6%A, 11.9%A, 12.2%A, 12.5%A, 12.8%A, 13.1%A, 13.4%A, 13.7%A, 1 4.0%A, 14.3%A, 14.6%A, 14.9%A, 15.2%A, 15.5%A, 15.8%A, 16.1%A, 16.4%A, 16.7%A, 17%A, 17.3%A, 17.6%A, 17.9%A, 18.2%A, 19.1%A, 20%A.

[0050] In this embodiment, the above-described limitations allow for a better layout between the cooling oil channel 14 and the winding, increasing both the minimum width of the cooling oil channel 14 and the size of the winding. This, in turn, better balances the oil flow between adjacent coils 131 and the size of the coil 131.

[0051] Please see Figure 2 In some embodiments, the included angle between the opposing faces of two adjacent coils 131 in the circumferential direction is less than or equal to 5°. This reduces the disturbance and eddies generated when the cooling oil flows within the heat dissipation channel 14, thereby improving the smoothness of the cooling oil flow within the heat dissipation channel and thus improving heat dissipation efficiency.

[0052] Please see Figure 2 In some embodiments, the opposing faces of two adjacent coils 131 are parallel to each other in the circumferential direction. This ensures that the flow area of ​​the cooling oil is equal at any location within the heat dissipation channel 14, thereby improving the smoothness of the cooling oil flow within the heat dissipation channel and thus enhancing heat dissipation efficiency.

[0053] It is understandable that when the opposite faces of two adjacent coils 131 are parallel to each other, the stator teeth 12 are fan-shaped teeth, and the circumferential dimension of the stator teeth 12 gradually increases along the axial direction away from the support plate 11.

[0054] Correspondingly, the projection of coil 131 on support plate 11 is also fan-shaped, and the circumferential dimension of coil 131 gradually increases along the axial direction away from support plate 11.

[0055] Please see as in 1 and Figure 3 , Figure 3 This is a schematic diagram of the connection between the toothed sleeve 15 and the support plate 11 provided in an exemplary embodiment of this disclosure. In some embodiments, the stator assembly 10 further includes a plurality of toothed sleeves 15. The plurality of toothed sleeves 15 are respectively sleeved on a plurality of stator teeth 12. The toothed sleeves 15 are connected to the support plate 11. The toothed sleeves 15 are located between adjacent stator teeth 12 and coils 131.

[0056] In this configuration, multiple stator teeth 12 correspond one-to-one with multiple coils 131, and multiple tooth sleeves 15 correspond one-to-one with multiple stator teeth 12, and multiple tooth sleeves 15 correspond one-to-one with multiple coils 131. Therefore, multiple tooth sleeves 15 are located between their corresponding stator teeth 12 and coils 131.

[0057] It is understandable that the outer circumferential surface of the stator tooth 12 is bonded to or has an interference fit with the inner circumferential surface of the tooth sleeve 15.

[0058] In this embodiment, by setting the tooth sleeve 15, on the one hand, two heat dissipation channels can be formed between the stator tooth 12 and the coil 131 by the tooth sleeve 15, so as to increase the heat dissipation area and improve the heat dissipation efficiency; on the other hand, the area of ​​fixing the stator tooth 12 can be increased, thereby improving the fixing stability of the stator tooth 12.

[0059] In addition, by setting the tooth sleeve 15, the stator teeth 12 and the winding insulation can be isolated to prevent the current in the winding 13 from forming a circuit through the stator teeth 12, thereby improving the overcurrent reliability of the stator assembly 10 and thus improving the operating stability of the motor 20.

[0060] In some embodiments, the gear sleeve 15 is integrally formed with the support plate 11. This can improve the strength of the connection between the gear sleeve 15 and the support plate 11, prevent the gear sleeve 15 from breaking off from the support plate 11, thereby improving the structural reliability of the stator assembly 10 and thus helping to improve the operational stability of the motor 20.

[0061] In some embodiments, the inner circumferential surface of the tooth sleeve 15 is bonded to the outer circumferential surface of the stator tooth 12. This simplifies the connection between the tooth sleeve 15 and the stator tooth 12, making it easy to operate and thereby improving the assembly efficiency of the stator assembly 10.

[0062] Please see Figure 1 In some embodiments, both ends of the stator tooth 12 are located outside the mounting hole 111. There are two windings 13. The two windings 13 are located on both sides of the support plate 11. The coil 131 of one winding 13 is sleeved on one end of the stator tooth 12. The coil 131 of the other winding 13 is sleeved on the other end of the stator tooth 12. In this way, the structural symmetry of the stator assembly 10 can be improved, which is conducive to improving the stress state of the stator assembly 10, thereby improving the structural reliability of the stator assembly 10.

[0063] In some embodiments, the two windings 13 are configured to be connected in parallel in the circuit. This increases the selectivity of the motor 20. For example, when a high power output is required, both windings 13 are connected to the circuit. When a lower power output is required, only one winding 13 is selected to be connected to the circuit. In addition, if one winding 13 fails, the other winding 13 can continue to operate, maintaining the basic operation of the motor 20.

[0064] Please see Figure 4 , Figure 4This is a schematic diagram of the stator tooth 12 provided in an exemplary embodiment of this disclosure. In some embodiments, the stator tooth 12 includes a body 121 and two end plates 122. Both ends of the body 121 are connected to the two end plates 122 respectively. The body 121 passes through a mounting hole 111. A coil 131 is located between the end plate 122 and the support plate 11, and the end plate 122 at least covers a portion of the end of the coil 131.

[0065] It is understandable that the end plate 122 and the main body 121 are made of the same material.

[0066] It is understood that the main body 121 is located in the toothed sleeve 15. Alternatively, two toothed sleeves 15 may be configured for each stator tooth 12, with the opposing surfaces of the two toothed sleeves 15 connected to the support plate 11. Or, one toothed sleeve 15 may be configured for each stator tooth 12, with the toothed sleeve 15 passing through the mounting hole 111.

[0067] It is understood that since the end plate 122 covers at least part of the end of the coil 131, the size of the end plate 122 is larger than the size of the mounting hole 111. When assembling the stator tooth 12 with the support plate 11, the stator tooth 12 can be configured as an assembly, or the support plate 11 can be cast around the stator tooth 12, or the support plate 11 can be configured as an assembly.

[0068] In this embodiment, by setting the end plate 122, the volume of the stator tooth 12 can be increased, thereby allowing the stator tooth 12 to have more magnetic conductive material, which in turn increases the magnetic flux of the stator assembly 10, thus improving the power and efficiency of the motor 20.

[0069] Please see Figure 4 In some embodiments, the main body 121 includes a first tooth 1211 and a second tooth 1212 extending in opposite directions. One end of the first tooth 1211 and one end of the second tooth 1212 are both inserted into the mounting hole 111. The other ends of the first tooth 1211 and the second tooth 1212 are respectively connected to two end plates 122. A coil 131 of one winding 13 is fitted onto the first tooth 1211, and a coil 131 of the other winding 13 is fitted onto the second tooth 1212. Thus, the stator tooth 12 is configured as an assembly, which facilitates its mounting on the support plate 11, improving the assemblability of the stator assembly 10 and thereby increasing the assembly efficiency of the stator assembly 10.

[0070] Please see Figure 3In some embodiments, a through hole 112 is provided on the outer periphery of the support plate 11. The through hole 112 is configured to engage with bolts to fix the support plate 11 to the housing 21 of the motor 20. In this way, the support plate 11 can be fixed to the motor 20 in a simple and operable manner, which can improve the installation efficiency of the stator assembly 10 and ensure the stability of the connection between the stator assembly 10 and the housing 21.

[0071] Specifically, the end of the bolt shank passes through the through hole 112 and is threaded into the threaded hole inside the housing 21.

[0072] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the motor 20 provided in an exemplary embodiment of this disclosure. In a second aspect, embodiments of this application provide a motor 20. The motor 20 includes a housing 21, a rotor shaft 22, a rotor assembly 23, and a stator assembly 10 provided in some embodiments of this application. The stator assembly 10 is mounted within the housing 21. The rotor shaft 22 is rotatably mounted within the housing 21. The rotor assembly 23 is sleeved on the rotor shaft 22 and located at one or both ends of the stator assembly 10. The housing 21 is filled with cooling oil.

[0073] Specifically, there are two stator assemblies 10, located at opposite ends of the rotor assembly 23. An air gap 24 exists between the stator assemblies 10 and the rotor assembly 23. When the two rotor assemblies 23 share the same rotor shaft 22, a through hole is provided on the support plate 11 for the rotor shaft 22 to pass through. This through hole is clearance-fitted with the rotor shaft 22.

[0074] It is understood that the motor 20 includes the stator assembly 10 described above. The motor 20 has all the beneficial effects of the stator assembly 10 described above, which will not be repeated here.

[0075] Thirdly, embodiments of this application provide a vehicle that includes the aforementioned motor 20.

[0076] It is understood that the vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0077] It is understood that the vehicle includes the aforementioned motor 20. The vehicle possesses all the beneficial effects of the aforementioned motor 20, which will not be elaborated upon here.

[0078] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0079] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0080] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0081] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A stator assembly (10), characterized in that, include: The support plate (11) is provided with a plurality of mounting holes (111), which are spaced apart along the circumference of the support plate (11); Multiple stator teeth (12) are respectively inserted into multiple mounting holes (111) and connected to the support plate (11); The winding (13) includes a plurality of coils (131), which are respectively sleeved on a plurality of stator teeth (12); In the circumferential direction, a heat dissipation oil passage (14) is defined between two adjacent coils (131).

2. The stator assembly (10) according to claim 1, characterized in that, In the circumferential direction, the distance between two adjacent stator teeth (12) is A, and the width of the heat dissipation oil channel (14) is B, satisfying: 5%A≤B≤25%A.

3. The stator assembly (10) according to claim 2, characterized in that, 10%A≤B≤20%A.

4. The stator assembly (10) according to claim 1, characterized in that, In the circumferential direction, the included angle between the opposite faces of two adjacent coils (131) is less than or equal to 5°.

5. The stator assembly (10) according to claim 4, characterized in that, In the circumferential direction, the opposite faces of two adjacent coils (131) are parallel to each other.

6. The stator assembly (10) according to any one of claims 1-5, characterized in that, The stator assembly (10) further includes a plurality of tooth sleeves (15), which are respectively sleeved on a plurality of stator teeth (12). The tooth sleeves (15) are connected to the support plate (11) and are located between the adjacent stator teeth (12) and the coil (131).

7. The stator assembly (10) according to claim 6, characterized in that, The toothed sleeve (15) is integrally formed with the support plate (11); and / or, The inner circumferential surface of the tooth sleeve (15) is bonded to the outer circumferential surface of the stator tooth (12).

8. The stator assembly (10) according to any one of claims 1-5, characterized in that, Both ends of the stator tooth (12) are located outside the mounting hole (111). There are two windings (13), which are located on both sides of the support plate (11). The coil (131) of one winding (13) is sleeved on one end of the stator tooth (12), and the coil (131) of the other winding (13) is sleeved on the other end of the stator tooth (12).

9. The stator assembly (10) according to claim 8, characterized in that, The two windings (13) are configured to be connected in parallel in the circuit.

10. The stator assembly (10) according to claim 8, characterized in that, The stator tooth (12) includes a main body (121) and two end plates (122). The two ends of the main body (121) are respectively connected to the two end plates (122). The main body (121) passes through the mounting hole (111). The coil (131) is located between the end plate (122) and the support plate (11), and the end plate (122) covers at least part of the end of the coil (131).

11. The stator assembly (10) according to claim 10, characterized in that, The main body (121) includes a first tooth (1211) and a second tooth (1212) extending in opposite directions. One end of the first tooth (1211) and one end of the second tooth (1212) are both inserted into the mounting hole (111). The other ends of the first tooth (1211) and the second tooth (1212) are respectively connected to the two end plates (122). In one winding (13), the coil (131) is sleeved on the first tooth (1211), and the coil (131) of the other winding (13) is sleeved on the second tooth (1212).

12. The stator assembly (10) according to any one of claims 1-5, characterized in that, A through hole (112) is provided on the outer periphery of the support plate (11), and the through hole (112) is configured to cooperate with a bolt to fix the support plate (11) to the housing (21) of the motor (20) by means of the bolt.

13. An electric motor (20), characterized in that, include: Outer shell (21); The stator assembly (10) as described in any one of claims 1-12 is installed within the housing (21); The rotor shaft (22) is rotatably mounted inside the housing (21); The rotor assembly (23) is sleeved on the rotor shaft (22) and located at one or both ends of the stator assembly (10); The outer casing (21) is filled with cooling oil.

14. A vehicle, characterized in that, Includes the motor (20) as described in claim 13.

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