Stator core, stator assembly, motor and vehicle

Abstract

The utility model relates to a stator core, a stator assembly, a motor and a vehicle, the stator core comprises a stator core body and a plurality of stator tooth crests, the stator core body comprises a stator yoke part and a plurality of stator tooth parts, the plurality of stator tooth parts are connected on the periphery of the stator yoke part along the circumferential direction of the stator core, and the stator tooth crests are arranged on the stator yoke part. A stator slot is formed between every two adjacent stator tooth parts; the radial outer end of each stator tooth part is provided with a slot, and the slot is provided with a first opening facing the radial outer side of the stator core. The stator tooth crest comprises a stator tooth crest body and a connecting plate connected to the radial inner side surface of the stator tooth crest body, the included angle between the stator tooth crest body and the connecting plate is an obtuse angle or an acute angle, and the connecting plate is inserted into the slot through the first opening. According to the stator iron core of the utility model, the connecting plates are not easy to separate from the slots, and the connection strength of the stator tooth crests is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and relates to a stator core, a stator assembly, a motor and a vehicle. Background Art

[0002] Improving the slot fill factor of a motor is crucial for motor performance and efficiency improvement. Moreover, increasing the slot fill factor helps enhance the heat dissipation capacity of the motor, and the resistance of the motor will also decrease accordingly. However, due to process limitations, it is difficult to increase the slot fill factor.

[0003] In the existing stator core, stator punching sheets are stamped from silicon steel sheets, and multiple stator punching sheets are laminated to form the stator core. The stator core is divided into a stator yoke part, stator tooth parts and stator tooth tips according to positions. The interval between adjacent stator tooth parts is a stator slot, and the interval between adjacent stator tooth tips is a stator slot opening. To ensure motor performance, the width of the stator slot opening along the circumferential direction of the stator punching sheet is designed to be relatively small. For a stator winding using round copper wires, the round copper wires need to be inserted into the stator slot through the narrow stator slot opening, making it difficult to achieve a high slot fill factor for the motor. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: aiming at the problem in the prior art that for a stator winding using round copper wires, the round copper wires need to be inserted into the stator slot through the narrow stator slot opening, making it difficult to achieve a high slot fill factor for the motor, to provide a stator core, a stator assembly, a motor and a vehicle.

[0005] To solve the above technical problem, on the one hand, the utility model provides a stator core, including a stator core body and a plurality of stator tooth tips. The stator core body includes a stator yoke part and a plurality of stator tooth parts. The plurality of stator tooth parts are connected to the outer periphery of the stator yoke part along the circumferential direction of the stator core, and a stator slot is formed between adjacent stator tooth parts;

[0006] A slot is arranged at the radially outer end of each stator tooth part, and the slot has a first opening facing the radially outer side of the stator core; the stator tooth tip includes a stator tooth tip body and a connecting plate connected to the radially inner surface of the stator tooth tip body. The included angle between the stator tooth tip body and the connecting plate is an obtuse angle or an acute angle, and the connecting plate is inserted into the slot from the first opening.

[0007] According to the stator core of the embodiment of the present utility model, the included angle between the stator tooth top body of the stator tooth top and the connecting plate is an obtuse angle or an acute angle, and the connecting plate is inserted into the slot from the first opening of the slot at the radially outer end of the stator tooth part. The stator winding has elasticity, and the outer end of the stator winding can apply an outward elastic force to the radially inner surface of the stator tooth top body. Since the included angle between the stator tooth top body and the connecting plate is an obtuse angle or an acute angle, under the action of the outward elastic force of the stator winding, the connecting plate applies a pressure to the slot wall of the slot, making it not easy for the connecting plate to come out of the slot and ensuring the connection strength of the stator tooth top.

[0008] In addition, when assembling the stator core, the copper wire can be wound on the stator tooth part first. After the winding is completed to form the stator winding, the stator tooth top is then installed. In this way, since the stator tooth top is not installed during the copper wire winding, the radially outer end opening of the stator slot is much larger than the width of the existing stator slot opening, which is convenient for the copper wire to be wound on the stator tooth part and makes it easier to achieve a high slot fill factor for the copper wire winding, thus realizing a high slot fill factor for the motor. In addition, a stator assembly with less magnetic leakage can be formed, which is more conducive to improving the performance of the motor.

[0009] Optionally, in the same group of the stator tooth part and the stator tooth top, the included angle between the stator tooth top body and the slot is equal to the included angle between the stator tooth top body and the connecting plate.

[0010] Optionally, along the circumferential direction of the stator core, the adjacent slots gradually approach the stator slot between the two slots from the inside to the outside;

[0011] Or,

[0012] Along the circumferential direction of the stator core, the adjacent slots gradually move away from the stator slot between the two slots from the inside to the outside.

[0013] Optionally, along the circumferential direction of the stator core, the connecting plates of the adjacent stator tooth tops are symmetrically arranged with respect to the stator slot between the two;

[0014] Along the circumferential direction of the stator core, the adjacent slots are symmetrically arranged with respect to the stator slot between the two.

[0015] Optionally, the stator slot extends along a first straight line parallel to the axis of the stator core;

[0016] And / or,

[0017] The stator tooth part extends along a second straight line parallel to the axis of the stator core;

[0018] And / or,

[0019] The stator tooth top extends along a third straight line parallel to the axis of the stator core.

[0020] Optionally, the stator slots are arranged at equal intervals in the circumferential direction of the stator core;

[0021] And / or,

[0022] the stator tooth portions are arranged at equal intervals in the circumferential direction of the stator core;

[0023] And / or,

[0024] the stator tooth tips are arranged at equal intervals in the circumferential direction of the stator core.

[0025] Optionally, the stator tooth tip is an integral structure.

[0026] Optionally, the stator core body is formed by laminating a plurality of stator punching sheets along the axial direction of the stator core;

[0027] The stator punching sheet includes a stator punching sheet yoke portion and a plurality of stator punching sheet tooth portions. The stator punching sheet yoke portion is in a circular ring shape, and the plurality of stator punching sheet tooth portions are connected to the outer circumference of the stator punching sheet yoke portion along the circumferential direction of the stator punching sheet;

[0028] Between adjacent stator punching sheet tooth portions of each stator punching sheet, a stator punching sheet slot is formed. Among the plurality of stator punching sheets, all the stator punching sheet yoke portions are laminated to form the stator yoke portion, all the stator punching sheet tooth portions located on the same straight line constitute the stator tooth portion, and all the stator punching sheet slots located on the same straight line constitute the stator slot.

[0029] Optionally, along the radial direction of the stator punching sheet, the width of the stator punching sheet slot gradually increases from inside to outside.

[0030] Optionally, a jack is provided at the radially outer end of each stator punching sheet tooth portion. Among the plurality of stator punching sheets, all the jacks located on the same straight line form the slot, and the radially outer ends of all the jacks located on the same straight line form the first opening.

[0031] Optionally, the radially inner surface of the stator tooth tip body is bonded to the radially outer surface of the stator tooth portion.

[0032] Optionally, the connecting plate is in transitional fit or interference fit with the slot wall of the slot.

[0033] Optionally, it further includes a plurality of fixing bars, and the fixing bars are connected between the stator tooth tip bodies of adjacent stator tooth tips.

[0034] Optionally, the fixing bar includes a first bayonet and a second bayonet spaced relative to each other in the circumferential direction of the stator core, and two stator tooth tips on both sides of the fixing bar. One side of the stator tooth tip body of one of the stator tooth tips inserted into the first bayonet, and one side of the stator tooth tip body of the other stator tooth tip inserted into the second bayonet.

[0035] Optionally, the first bayonet has a first outer radial surface, a first inner radial surface and a first circumferential surface. The first outer radial surface is located radially outside the first inner radial surface, and the first circumferential surface is connected between one side of the first outer radial surface and one side of the first inner radial surface; a first outer inclined surface is provided on one side of the radially outer surface of the stator tooth tip body along the circumferential direction of the stator core, and a first inner inclined surface is provided on one side of the radially inner surface of the stator tooth tip body along the circumferential direction of the stator core; the first outer inclined surface gradually inclines radially inward of the stator core from the center of the radially outer surface of the stator tooth tip body to its edge; the first inner inclined surface gradually inclines radially outward of the stator core from the center of the radially outer surface of the stator tooth tip body to its edge; the first outer inclined surface fits with the first outer radial surface, and the first inner inclined surface fits with the first inner radial surface;

[0036] And / or,

[0037] The second bayonet has a second outer radial surface, a second inner radial surface and a second circumferential surface. The second outer radial surface is located radially outside the second inner radial surface, and the second circumferential surface is connected between one side of the second outer radial surface and one side of the second inner radial surface; a second outer inclined surface is provided on the other side of the radially outer surface of the stator tooth tip body along the circumferential direction of the stator core, and a second inner inclined surface is provided on the other side of the radially inner surface of the stator tooth tip body along the circumferential direction of the stator core; the second outer inclined surface gradually inclines radially inward of the stator core from the center of the radially outer surface of the stator tooth tip body to its edge; the second inner inclined surface gradually inclines radially outward of the stator core from the center of the radially outer surface of the stator tooth tip body to its edge; the second outer inclined surface fits with the second outer radial surface, and the second inner inclined surface fits with the second inner radial surface

[0038] On the other hand, an embodiment of the present invention provides a stator assembly, including a stator winding and the above-mentioned stator core, and one stator winding is arranged in each stator slot.

[0039] Optionally, each stator winding is wound outside the corresponding stator tooth portion, and an insulating structure is provided between the stator winding and the stator tooth portion.

[0040] Optionally, the insulation structure includes insulating paper disposed between the stator winding and the stator teeth;

[0041] Or,

[0042] the insulation structure includes a rubber pad disposed between the stator winding and the stator teeth;

[0043] Or,

[0044] the insulation structure includes insulating glue disposed between the stator winding and the stator teeth;

[0045] Or,

[0046] the insulation structure includes an insulating coating disposed on two opposite side surfaces of the stator teeth at intervals along the circumferential direction of the stator core;

[0047] Or,

[0048] the insulation structure includes an insulating coating disposed on the outer surface of the stator winding

[0049] The stator assembly provided by the embodiment of the present invention has all the advantages of the above-mentioned stator core.

[0050] On the other hand, the embodiment of the present invention further provides a motor, including a housing, a rotor assembly, and the above-mentioned stator assembly, wherein the stator assembly and the rotor assembly are disposed in the housing.

[0051] The motor can be an inner-rotor motor, that is, the rotor assembly is disposed inside the stator assembly; the motor can also be an outer-rotor motor, that is, the rotor assembly is disposed outside the stator assembly.

[0052] The motor provided by the embodiment of the present invention has all the advantages of the above-mentioned stator core.

[0053] On the other hand, the embodiment of the present invention further provides a vehicle, including the above-mentioned motor.

[0054] The vehicle provided by the embodiment of the present invention has all the advantages of the above-mentioned stator core.

[0055] The vehicle can be, for example, an aircraft, a vehicle, etc. Description of the Drawings

[0056] Figure 1 is a schematic diagram of the stator assembly provided by the first embodiment of the present invention;

[0057] Figure 2 is Figure 1 an enlarged view of part a in

[0058] Figure 3 It is a schematic diagram of the stator core of the stator assembly provided by the first embodiment of the present utility model;

[0059] Figure 4 It is a schematic diagram of the stator core body of the stator core of the stator assembly provided by the first embodiment of the present utility model;

[0060] Figure 5 It is an enlarged view of the stator tooth tip of the stator core of the stator assembly provided by the first embodiment of the present utility model;

[0061] Figure 6 It is an enlarged view of the fixing strip of the stator core of the stator assembly provided by the first embodiment of the present utility model.

[0062] The reference numerals in the specification are as follows:

[0063] 10. Stator core; 20. Stator winding;

[0064] 1. Stator core body; 11. Stator yoke; 12. Stator tooth part; 121. Slot; 1211. First opening; 1212. Arc bottom wall; 13. Stator slot; 14. Stator punching sheet; 141. Stator punching sheet yoke; 142. Stator punching sheet tooth part; 1421. Jack; 143. Stator punching sheet slot;

[0065] 2. Stator tooth tip; 21. Stator tooth tip body; 211. First outer inclined plane; 212. First inner inclined plane; 213. Second outer inclined plane; 214. Second inner inclined plane; 22. Connecting plate; 221. Arc surface;

[0066] 3. Fixing strip; 31. First bayonet; 311. First outer radial surface; 312. First inner radial surface; 313. First circumferential surface; 32. Second bayonet; 321. Second outer radial surface; 322. Second inner radial surface; 323. Second circumferential surface;

[0067] 4. Insulation structure. Detailed implementation manners

[0068] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0069] First embodiment

[0070] See Figures 1 to 6, the stator assembly provided by the first embodiment of the present utility model includes a stator winding 20 and a stator core 10. The stator core 10 includes a stator core body 1 and a plurality of stator tooth tips 2. The stator core body 1 includes a stator yoke portion 11 and a plurality of stator tooth portions 12. The plurality of stator tooth portions 12 are connected to the outer periphery of the stator yoke portion 11 along the circumferential direction of the stator core 10, and a stator slot 13 is formed between adjacent stator tooth portions 12. Each stator slot 13 is provided with a stator winding 20. The stator tooth tips 2 are independently provided with respect to the stator core body 1, and a stator tooth tip 2 is fixed to the radially outer side of each stator tooth portion 12.

[0071] See Figures 3 to 5 , a slot 121 is provided at the radially outer end of each stator tooth portion 12. The slot 121 has a first opening 1211 facing the radially outer side of the stator core 10. The slot 121 also has a second opening and a third opening. The second opening is formed at one end of the length direction of the slot 121, and the third opening is formed at the other end of the length direction of the slot 121.

[0072] A jack 1421 is provided at the radially outer end of each stator punching tooth portion 142. All the jacks 1421 located on the same straight line form the slot 121, and the radially outer end openings of all the jacks 1421 located on the same straight line form the first opening 1211.

[0073] The stator tooth tip 2 includes a stator tooth tip body 21 and a connecting plate 22 connected to the radially inner surface of the stator tooth tip body 21. The included angle b between the stator tooth tip body 21 and the connecting plate 22 is an obtuse angle or an acute angle. The connecting plate 22 is inserted into the slot 121 through the first opening 1211. The two side surfaces of the stator tooth tip body 21 along the circumferential direction of the stator core 10 protrude from the two side surfaces of the stator tooth portion 12 along the circumferential direction of the stator core 10. In this way, by inserting the connecting plate 22 into the slot 121, the installation and positioning of the stator tooth tip 2 and the stator tooth portion 12 can be realized.

[0074] See Figure 4, define the straight line direction from the radially inner end to the radially outer end of the slot 121 as the inner-outer extension direction A of the slot 121, and define the direction from the radially inner end to the radially outer end of the stator tooth portion 12 as the inner-outer extension direction B of the stator tooth portion 12; in the same group of the stator tooth portion 12 and the stator tooth tip 2 (one stator tooth portion 12 and the stator tooth tip 2 connected thereto form a group), the included angle between the stator tooth tip body 21 and the slot 121 is equal to the included angle b between the stator tooth tip body 21 and the connecting plate 22. Preferably, in the same group of the stator tooth portion 12 and the stator tooth tip 2, the inner-outer extension direction A of the slot 121 is consistent with the inner-outer extension direction of the connecting plate 22. In this way, the shapes of the slot 121 and the connecting plate 22 match, and it is not easy for the connecting plate 22 to loosen after being inserted into the slot 121.

[0075] The inner-outer extension direction A of the slot 121 and the inner-outer extension direction B of the stator tooth portion 12 have a non-zero included angle c. The stator winding 20 has elasticity, and the outer end of the stator winding 20 can apply an outward elastic force to the radially inner side surface of the stator tooth tip body 21. Since the included angle between the stator tooth tip body 21 and the connecting plate 22 is an obtuse angle or an acute angle, under the action of the outward elastic force of the stator winding 20, the connecting plate 22 applies a pressure to the groove wall of the slot 121, making it not easy for the connecting plate 22 to come out of the slot 121 and ensuring the connection strength of the stator tooth tip 2.

[0076] In addition, when assembling the stator core 10, the copper wire can be wound around the stator tooth portion 12 first, and after the winding is completed to form the stator winding 20, the stator tooth tip 2 is installed. In this way, since the stator tooth tip 2 is not installed during the copper wire winding, the radially outer end opening of the stator slot 13 is much larger than the existing stator slot width, which is convenient for the copper wire to be wound around the stator tooth portion and easier to achieve a high slot fill factor of the copper wire winding, thus achieving a high slot fill factor of the motor. In addition, a stator assembly with less magnetic leakage can be formed, which is more conducive to improving the performance of the motor.

[0077] In addition, since the stator tooth tip 13 is independently provided, a material with a smaller weight can be used, and the deformation and vibration generated by the force are relatively small, and there is no need to increase the outer circle of the stator core 10 with a sheath or other means to improve the stiffness.

[0078] In addition, the motor with a high slot fill factor has the following advantages:

[0079] The motor can reach a higher torque, improving the motor torque and power density.

[0080] The motor resistance decreases, and the motor efficiency is significantly improved.

[0081] The heat dissipation of the motor stator winding is enhanced, reducing the temperature rise of the motor.

[0082] The size of the stator slot 13 can be appropriately reduced, which can effectively improve the magnetic saturation problem, reduce the iron loss of the motor and improve the output capacity of the motor.

[0083] The stator slot 13 extends along a first straight line parallel to the axis of the stator core 10.

[0084] The stator tooth portion 12 extends along a second straight line parallel to the axis of the stator core 10.

[0085] The stator tooth top 2 extends along a third straight line parallel to the axis of the stator core 10. The first straight line, the second straight line and the third straight line are parallel to each other and are spaced from each other in the circumferential direction of the stator core 10.

[0086] The stator slots 13 are arranged at equal intervals in the circumferential direction of the stator core 10; the stator tooth portions 12 are arranged at equal intervals in the circumferential direction of the stator core; the stator tooth 12 tops are arranged at equal intervals in the circumferential direction of the stator core 10.

[0087] Preferably, the stator tooth top 2 is an integral structure to simplify the assembly process.

[0088] The stator core body 11 is formed by laminating a plurality of stator punching sheets 14 along the axial direction of the stator core 10; the stator punching sheet 14 includes a stator punching sheet yoke portion 141 and a plurality of stator punching sheet tooth portions 142, the stator punching sheet yoke portion 141 is in a circular ring shape, and the plurality of stator punching sheet tooth portions 142 are connected to the outer circumference of the stator punching sheet yoke portion 141 along the circumferential direction of the stator punching sheet 14; a stator punching sheet slot 143 is formed between adjacent stator punching sheet tooth portions 142 of each stator punching sheet 14, and among the plurality of stator punching sheets 14, all the stator punching sheet yoke portions 141 are laminated to form the stator yoke portion 11, all the stator punching sheet tooth portions 142 located on the same straight line constitute the stator tooth portion 12, and all the stator punching sheet slots 143 located on the same straight line constitute the stator slot 13.

[0089] In the prior art, the stator punching sheet 14 is an integral structure, that is, the stator punching sheet yoke portion 141, the stator punching sheet tooth portion 142 and the stator punching sheet tooth top are an integral structure, and a plurality of stator punching sheets 14 are laminated to form the stator core 10. The stator core 10 of the embodiment of the present invention has a completely different structure. The stator punching sheet yoke portion 141 and the stator punching sheet tooth portion 142 are an integral structure. There is no stator punching sheet tooth top on the stator punching sheet 14, but an integral structure of the stator tooth top 2 is used to replace the structure of laminating a plurality of stator punching sheet tooth tops, and the structural difference is large.

[0090] See Figure 4, along the radial direction of the stator punching sheet 14, the width of the stator punching sheet slot 143 gradually increases from inside to outside. In this way, the outer end opening of the stator punching sheet slot 143 is larger, which is beneficial to the winding of copper wires.

[0091] The stator punching sheet tooth part 142 protrudes radially from the stator punching sheet yoke part 141 along the stator punching sheet 14. That is, with the center of the stator punching sheet 14 as the center, a plurality of the stator punching sheet tooth parts 142 are arranged radially.

[0092] A jack 1421 is arranged at the radially outer end of each stator punching sheet tooth part 142. For a plurality of the stator punching sheets 14, all the jacks 1421 located on the same straight line form the slot 121, and the radially outer end openings of all the jacks 1421 located on the same straight line form the first opening 1211.

[0093] The radially inner surface of the stator tooth top body 21 is adhesively bonded to the radially outer surface of the stator tooth part 12. In this way, the connection strength between the stator tooth top 2 and the stator tooth part 12 can be increased.

[0094] The connecting plate 22 is in transitional fit or interference fit with the wall of the slot 121.

[0095] Along the circumferential direction of the stator core 10, adjacent slots 121 gradually approach the stator slot 13 between the two slots 121 from inside to outside; that is, adjacent slots 121 are in an eight-shaped configuration.

[0096] Along the circumferential direction of the stator core 10, adjacent slots 121 gradually move away from the stator slot 13 between the two slots 121 from inside to outside. That is, adjacent slots 121 are in an inverted eight-shaped configuration.

[0097] That is, for any one of the slots 121, it is in an eight-shaped configuration with the adjacent slot 121 on one side and in an inverted eight-shaped configuration with the adjacent slot 121 on the other side.

[0098] More preferably, along the circumferential direction of the stator core 10, the connecting plates 22 of adjacent stator tooth tops 2 are symmetrically arranged with respect to the stator slot 13 between them; along the circumferential direction of the stator core 10, adjacent slots 121 are symmetrically arranged with respect to the stator slot 13 between them.

[0099] See Figure 4 and Figure 5, an arc surface 221 is provided at the end of the connecting plate 22, and the bottom wall of the slot 121 is an arc bottom wall 1212. The arc surface 221 fits with the arc bottom wall 1212, so that the shape of the end of the connecting plate 22 matches the bottom wall of the slot 121, the bottom wall of the slot 121 wraps the end of the connecting plate 22, and the cooperation between the connecting plate 22 and the slot 121 is closer.

[0100] See Figure 2 and Figure 6 , further comprising a plurality of fixing bars 3, and the fixing bars 3 are connected between the stator tooth top bodies 21 of adjacent stator tooth tops 2.

[0101] The fixing bar 3 includes a first bayonet 31 and a second bayonet 32 that are spaced opposite to each other along the circumferential direction of the stator core 10. For the two stator tooth tops 2 on both sides of the fixing bar 3, one side of the stator tooth top body 21 of one of the stator tooth tops 2 facing the fixing bar is inserted into the first bayonet 31, and one side of the stator tooth top body 21 of the other stator tooth top 2 facing the fixing bar 3 is inserted into the second bayonet 32. In this way, the fixing bar can limit the circumferential displacement of the stator tooth top 2.

[0102] The fixing bar 3 can press the stator winding 20. The fixing bar 3 is subject to an outward radial force. The fixing bar 3 is in contact with the stator tooth top bodies 21 of two adjacent stator tooth tops 2, so that the fixing bar 3 gives an outward radial force to the stator tooth top 2. And because, along the circumferential direction of the stator core 10, the connecting plates 22 of adjacent stator tooth tops 2 are symmetrically arranged with respect to the stator slot 13 therebetween; along the circumferential direction of the stator core 10, the adjacent slots 121 are symmetrically arranged with respect to the stator slot 13 therebetween. For any one of the slots 121, it is in a shape of an inverted V with the adjacent slot 121 on one side and in a shape of a V with the adjacent slot 121 on the other side. The adjacent two slots 121 are not parallel (there is an included angle), which will hinder the radial sliding of the fixing bar 3 and the stator tooth top 13, so as to realize the mutual limitation of the stator winding 20, the stator tooth top 2 and the fixing bar 3. The stator winding 20, the stator tooth top 2 and the fixing bar 3 have no radial and circumferential displacements, and can completely fix the stator tooth top 2, improving the overall stiffness of the stator core 10.

[0103] See Figure 5 and Figure 6, the first bayonet 31 has a first outer radial surface 311, a first inner radial surface 312 and a first circumferential surface 313. The first outer radial surface 311 is located radially outside the first inner radial surface 312, and the first circumferential surface 313 is connected between one side of the first outer radial surface 311 and one side of the first inner radial surface 312. On one side of the stator tooth tip body 21 along the circumferential direction of the stator core 10, a first outer inclined surface 211 is provided on the radially outer surface of the stator tooth tip body, and a first inner inclined surface 212 is provided on the radially inner surface of the stator tooth tip body along one side of the circumferential direction of the stator core 10. The first outer inclined surface 211 inclines gradually from the center of the radially outer surface of the stator tooth tip body 21 towards its edge and towards the radially inner side of the stator core 10. The first inner inclined surface 212 inclines gradually from the center of the radially outer surface of the stator tooth tip body 21 towards its edge and towards the radially outer side of the stator core 10. The first outer inclined surface 211 fits with the first outer radial surface 311, and the first inner inclined surface 212 fits with the first inner radial surface 312. The first circumferential surface 313 abuts against one side end face of the stator tooth tip body 21.

[0104] See Figure 5 and Figure 6 , the second bayonet 32 has a second outer radial surface 321, a second inner radial surface 322 and a second circumferential surface 323. The second outer radial surface 321 is located radially outside the second inner radial surface 322, and the second circumferential surface 323 is connected between one side of the second outer radial surface 321 and one side of the second inner radial surface 322. On the other side of the stator tooth tip body 21 along the circumferential direction of the stator core 10, a second outer inclined surface 213 is provided on the radially outer surface of the stator tooth tip body, and a second inner inclined surface 214 is provided on the radially inner surface of the stator tooth tip body along the other side of the circumferential direction of the stator core 10. The second outer inclined surface 213 inclines gradually from the center of the radially outer surface of the stator tooth tip body 21 towards its edge and towards the radially inner side of the stator core 10. The second inner inclined surface 214 inclines gradually from the center of the radially outer surface of the stator tooth tip body 21 towards its edge and towards the radially outer side of the stator core 10. The second outer inclined surface 213 fits with the second outer radial surface 321, and the second inner inclined surface 214 fits with the second inner radial surface 322. The second circumferential surface 323 abuts against the other side end face of the stator tooth tip body 21.

[0105] The width of the first outer inclined section 211 is greater than the width of the first outer radial section 311, so that a partial surface of the first outer inclined section 211 is exposed. The width of the second outer inclined section 213 is greater than the width of the second outer radial section 321, so that a partial surface of the second outer inclined section 213 is exposed. In this way, by providing the first outer inclined section 211 and the second outer inclined section 213, the air-gap magnetic density of the motor is adjusted and improved, the motor harmonics are reduced, the no-load back electromotive force becomes more sinusoidal, and the motor loss is reduced.

[0106] The width of the first inner inclined section 212 is greater than the width of the first inner radial section 312, so that a partial surface of the first inner inclined section 212 is exposed. The width of the second inner inclined section 214 is greater than the width of the second inner radial section 322, so that a partial surface of the second outer inclined section 213 is exposed. In this way, by providing the first inner inclined section 212 and the second inner inclined section 214, the air-gap magnetic density of the motor can be adjusted and improved, the motor harmonics are reduced, the no-load back electromotive force becomes more sinusoidal, and the motor loss is reduced.

[0107] See Figure 2 , each of the stator windings 20 is wound outside the corresponding stator tooth portion 12, and an insulating structure 4 is provided between the stator winding 20 and the stator tooth portion 12.

[0108] In this embodiment, the insulating structure 4 includes insulating paper, and the insulating paper is provided between the stator winding 20 and the stator tooth portion 12.

[0109] In another alternative embodiment, the insulating structure 4 includes a rubber pad, and the rubber pad is provided between the stator winding 20 and the stator tooth portion 12.

[0110] In another alternative embodiment, the insulating structure 4 includes insulating glue, and the insulating glue is provided between the stator winding 20 and the stator tooth portion 12.

[0111] In another alternative embodiment, the insulating structure 4 includes an insulating coating, and the insulating coating is provided on two opposite side surfaces of the stator tooth portion 12 spaced apart in the circumferential direction of the stator core 10.

[0112] In another alternative embodiment, the insulating structure includes an insulating coating, and the insulating coating is provided on the outer surface of the stator winding 20.

[0113] Second Embodiment

[0114] The stator assembly provided in the second embodiment of the present utility model is different from the first embodiment in that the fixing strip is cancelled.

[0115] In this embodiment, a highly viscous glue can be used to increase the connection strength of the stator tooth tip 2.

[0116] Third Embodiment

[0117] The stator assembly provided by the fifth embodiment of the present utility model is different from the first embodiment in that the fixing strip is cancelled, and the top of the stator tooth is fixed to the radial outer end face of the stator tooth part by using a tape.

[0118] Fourth Embodiment

[0119] The stator assembly provided by the fifth embodiment of the present utility model is different from the first embodiment in that the fixing strip is cancelled, and a pressing member is used to press the outer peripheral surface of the top of the stator tooth so as to fix the top of the stator tooth to the radial outer end face of the stator tooth part.

[0120] In addition, an embodiment of the present utility model further provides a motor, which includes a housing, a rotor assembly and the stator assembly of the above embodiment, and the stator assembly and the rotor assembly are arranged in the housing.

[0121] The motor can be an inner-rotor motor, that is, the rotor assembly is arranged inside the stator assembly; the motor can also be an outer-rotor motor, that is, the rotor assembly is arranged outside the stator assembly.

[0122] The motor provided by the embodiment of the present utility model has all the advantages of the stator core 10 of the above embodiment.

[0123] In addition, an embodiment of the present utility model further provides a vehicle, which includes the motor of the above embodiment.

[0124] The vehicle provided by the embodiment of the present utility model has all the advantages of the above-mentioned stator core 10.

[0125] The vehicle can be, for example, an aircraft, a vehicle, etc. Corresponding to the aircraft, by using the motor of the above embodiment, under the original weight and volume requirements of the motor, the output power and output torque of the motor can be improved, so that the aircraft can carry a greater load.

[0126] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A stator core (10), characterized in that: The invention comprises a stator core body (1) and a plurality of stator tooth tops (2), wherein the stator core body (1) comprises a stator yoke (11) and a plurality of stator tooth parts (12), wherein the plurality of stator tooth parts (12) are connected to the outer periphery of the stator yoke (11) along the circumferential direction of the stator core (10), and stator slots (13) are formed between adjacent stator tooth parts (12); A slot (121) is provided at the radial outer end of each stator tooth portion (12), and the slot (121) has a first opening (1211) facing the radial outer side of the stator core; the stator tooth top (2) comprises a stator tooth top body (21) and a connecting plate (22) connected to the radial inner surface of the stator tooth top body (21), the angle between the stator tooth top body (21) and the connecting plate (22) is an obtuse angle or an acute angle, and the connecting plate (22) is inserted into the slot (121) through the first opening (1211).

2. The stator core (10) according to claim 1, characterized in that: In the same group of the stator tooth portion (12) and the stator tooth top (2), the included angle between the stator tooth top body (21) and the slot (121) is equal to the included angle between the stator tooth top body (21) and the connecting plate (22).

3. The stator core (10) according to claim 1, characterized in that: Along the circumferential direction of the stator core (10), adjacent slots (121) gradually approach the stator slot (13) between two slots (121) from the inside to the outside; or, Along the circumferential direction of the stator core (10), adjacent slots (121) gradually move away from the stator slot (13) between two slots (121) from the inside to the outside.

4. The stator core (10) according to claim 1, characterized in that: Along the circumferential direction of the stator core (10), the connecting plates (22) of adjacent stator tooth tops (2) are symmetrically arranged with respect to the stator slot (13) therebetween; Along the circumferential direction of the stator core (10), adjacent slots (121) are symmetrically arranged with respect to the stator slot (13) therebetween.

5. The stator core (10) according to claim 1, characterized in that: The stator slot (13) extends along a first straight line parallel to the axis of the stator core (10); and / or, The stator tooth portion (12) extends along a second straight line parallel to the axis of the stator core (10); and / or, The stator tooth top (2) extends along a third straight line parallel to the axis of the stator core (10).

6. The stator core (10) according to claim 1, characterized in that: The stator slots (13) are arranged at equal intervals along the circumferential direction of the stator core (10); and / or, The stator teeth (12) are arranged at equal intervals along the circumferential direction of the stator core (10); and / or, The stator tooth tops (2) are arranged at equal intervals along the circumferential direction of the stator core.

7. The stator core (10) according to claim 1, characterized in that: The stator tooth top (2) is an integrated structure.

8. The stator core (10) according to claim 1, characterized in that: The stator core body (1) is formed by stacking a plurality of stator punching sheets (14) along the axial direction of the stator core (10); The stator sheet (14) comprises a stator sheet yoke (141) and a plurality of stator sheet teeth (142); the stator sheet yoke (141) is annular; and the plurality of stator sheet teeth (142) are connected to the outer periphery of the stator sheet yoke (141) along the circumferential direction of the stator sheet (14); Stator punching slots (143) are formed between adjacent stator punching tooth portions (142) of each stator punching sheet (14); among the plurality of stator punching sheets (14), all the stator punching yoke portions (141) are stacked to form the stator yoke portion (11); all the stator punching tooth portions (142) located on the same straight line constitute the stator tooth portion (12); and all the stator punching slots (143) located on the same straight line constitute the stator slots (13).

9. The stator core (10) according to claim 8, characterized in that: Along the radial direction of the stator punching sheet (14), the width of the stator punching sheet slot (143) gradually increases from inside to outside.

10. The stator core (10) according to claim 8, characterized in that: A plug hole (1421) is provided at the radial outer end of each stator punching tooth portion (142); in a plurality of stator punching sheets (14), all of the plug holes (1421) located on the same straight line form the slot (121); and the radial outer end openings of all of the plug holes (1421) located on the same straight line form the first opening (1211).

11. The stator core (10) according to claim 1, characterized in that: The radial inner surface of the stator tooth tip body (21) is bonded to the radial outer surface of the stator tooth portion (12).

12. The stator core (10) according to claim 1, characterized in that: The connecting plate (22) and the slot wall of the slot (121) are in transition fit or interference fit.

13. The stator core (10) according to claim 1, characterized in that: It also comprises a plurality of fixing bars (3), wherein the fixing bars (3) are connected between the stator tooth tip bodies (21) of adjacent stator tooth tips (2).

14. The stator core (10) according to claim 13, characterized in that: The fixing bar (3) comprises a first bayonet (31) and a second bayonet (32) spaced opposite to each other along the circumferential direction of the stator core, and two stator tooth tops (2) on both sides of the fixing bar (3), wherein a side of a stator tooth top body (21) of one of the stator tooth tops (2) facing the fixing bar (3) is inserted into the first bayonet (31), and a side of a stator tooth top body (21) of the other of the stator tooth tops (2) facing the fixing bar (3) is inserted into the second bayonet (32).

15. The stator core (10) according to claim 14, characterized in that: The first bayonet (31) comprises a first outer radial surface (311), a first inner radial surface (312) and a first circumferential surface (313); the first outer radial surface (311) is located radially outside the first inner radial surface (312); the first circumferential surface (313) is connected between one side of the first outer radial surface (311) and one side of the first inner radial surface (312); a first outer chamfered surface (211) is provided on one side of the radial outer surface of the stator tooth tip body (21) along the circumferential direction of the stator core (10); and a first outer chamfered surface (211) is provided on the radial inner surface of the stator tooth tip body (21) along the circumferential direction of the stator core (10). A first inner beveled surface (212) is provided on one side of the iron core (10) in the circumferential direction; the first outer beveled surface (211) is gradually inclined toward the radial inner side of the stator iron core (10) from the center of the radial outer surface of the stator tooth tip body (21) to its edge; the first inner beveled surface (212) is gradually inclined toward the radial outer side of the stator iron core (10) from the center of the radial outer surface of the stator tooth tip body (21) to its edge; the first outer beveled surface (211) is in contact with the first outer radial surface (311), and the first inner beveled surface (212) is in contact with the first inner radial surface (312); and / or, The second bayonet (32) comprises a second outer radial surface (321), a second inner radial surface (322) and a second circumferential surface (323); the second outer radial surface (321) is located radially outside the second inner radial surface (322); the second circumferential surface (323) is connected between one side of the second outer radial surface (321) and one side of the second inner radial surface (322); a second outer chamfered surface (213) is provided on the other side of the radial outer surface of the stator tooth tip body (21) along the circumferential direction of the stator core (10); and a second outer chamfered surface (213) is provided on the radial inner surface of the stator tooth tip body (21) along the circumferential direction of the stator core (10). A second inner beveled surface (214) is provided on the other side of the core (10) in the circumferential direction; the second outer beveled surface (213) is gradually inclined toward the radial inner side of the stator core (10) from the center of the radial outer surface of the stator tooth tip body (21) to its edge; the second inner beveled surface (214) is gradually inclined toward the radial outer side of the stator core (10) from the center of the radial outer surface of the stator tooth tip body (21) to its edge; the second outer beveled surface (213) is in contact with the second outer radial surface (321), and the second inner beveled surface (214) is in contact with the second inner radial surface (322).

16. A stator assembly, characterized in that: It comprises a stator winding (20) and a stator core (10) according to any one of claims 1 to 15, wherein each of the stator slots (13) is provided with a stator winding (20).

17. The stator assembly according to claim 16, characterized in that Each stator winding (20) is wound around the outside of the corresponding stator tooth (12), and an insulation structure (4) is provided between the stator winding (20) and the stator tooth (12).

18. The stator assembly according to claim 17, characterized in that The insulating structure (4) comprises insulating paper, wherein the insulating paper is arranged between the stator winding (20) and the stator tooth portion (12); or, The insulating structure (4) comprises a rubber pad, wherein the rubber pad is arranged between the stator winding (20) and the stator tooth portion (12); or, The insulating structure (4) comprises insulating glue, and the insulating glue is arranged between the stator winding (20) and the stator tooth portion (12); or, The insulating structure (4) comprises an insulating coating, wherein the insulating coating is arranged on two side surfaces of the stator tooth portion (12) which are spaced apart from each other in the circumferential direction of the stator core (10); or, The insulating structure (4) comprises an insulating coating, which is arranged on the outer surface of the stator winding (20).

19. A motor, characterized in that: It comprises a housing, a rotor assembly and the stator assembly according to any one of claims 16 to 18, wherein the stator assembly and the rotor assembly are arranged in the housing.

20. A means of transport, characterized in that: Including the motor as claimed in claim 19.

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