Stator core, stator assembly, motor and vehicle

Abstract

The invention 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 to the periphery of the stator yoke part along the circumferential direction of the stator core, and the stator tooth crests are connected to the stator yoke part along the circumferential direction of the stator core. 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 core provided by the invention, the connecting plates are not easy to separate from the slots, and the connecting strength of the stator tooth crests is ensured.

Description

Technical Field

[0001] This invention belongs to the field of motor technology and relates to a stator core, stator assembly, motor and vehicle. Background Technology

[0002] Improving the slot fill factor is crucial for motor performance and efficiency, and it also helps enhance heat dissipation and reduce motor resistance. However, due to manufacturing limitations, increasing the slot fill factor is quite challenging.

[0003] Existing stator cores are made by stamping silicon steel sheets into stator laminations, and then stacking multiple stator laminations to form the stator core. The stator core is divided into stator yoke, stator teeth, and stator tooth tips according to their positions. The interval between adjacent stator teeth is the stator slot, and the interval between adjacent stator tooth tips is the stator slot opening. To ensure motor performance, the width of the stator slot opening along the circumference of the stator laminations is designed to be relatively small. When using stator windings with round copper wire, the round copper wire needs 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 Invention

[0004] The technical problem to be solved by the present invention is: in the prior art, the stator winding using round copper wire requires the round copper wire to be inserted into the stator slot through a narrow stator slot opening, which makes it difficult to achieve a high slot fill factor in the motor. The present invention provides a stator core, stator assembly, motor and vehicle.

[0005] To solve the above-mentioned technical problems, on the one hand, the present invention provides a stator core, including a stator core body and a plurality of stator tooth tips. The stator core body includes a stator yoke and a plurality of stator teeth. The plurality of stator teeth are connected to the outer periphery of the stator yoke along the circumferential direction of the stator core, and stator slots are formed between adjacent stator teeth.

[0006] Each of the stator teeth is provided with a slot at its radially outer end, the slot having a first opening facing the radially outer side of the stator core; the stator tooth top includes a stator tooth top body and a connecting plate connected to the radially inner surface of the stator tooth top body, the angle between the stator tooth top body and the connecting plate being an obtuse angle or an acute angle, and the connecting plate being inserted into the slot through the first opening.

[0007] According to an embodiment of the present invention, in the stator core, the angle between the stator tooth tip body and the connecting plate is an obtuse or acute angle. The connecting plate is inserted into the slot through the first opening of the slot at the radially outer end of the stator tooth. The stator winding is elastic, and the outer end of the stator winding can apply an outward elastic force to the radially inner surface of the stator tooth tip body. Because the angle between the stator tooth tip body and the connecting plate is an obtuse or acute angle, under the action of the outward elastic force of the stator winding, the connecting plate applies pressure to the slot wall of the slot, making it difficult for the connecting plate to come out of the slot, thus ensuring the connection strength of the stator tooth tip.

[0008] Furthermore, during stator core assembly, copper wire can be wound onto the stator teeth first. After the winding is completed and the stator winding assembly is formed, the stator tooth tops can be installed. Because the stator tooth tops are not yet installed during copper wire winding, the radial outer opening of the stator slots is much larger than the existing stator slot width, facilitating copper wire winding on the stator teeth and making it easier to achieve high slot fill factor, thus achieving a high slot fill factor for the motor. Additionally, this results in a stator assembly with less leakage flux, which is more conducive to improving motor performance.

[0009] Optionally, in the same group of stator teeth and stator tooth tips, the angle between the stator tooth tip body and the slot is equal to the angle between the stator tooth tip body and the connecting plate.

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

[0011] or,

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

[0013] Optionally, along the circumferential direction of the stator core, the connecting plates of adjacent stator tooth tips are symmetrically arranged about the stator slots between them;

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

[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 teeth extend along a second straight line parallel to the axis of the stator core;

[0018] And / or,

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

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

[0021] And / or,

[0022] The stator teeth are arranged at equal intervals along the circumferential direction of the stator core;

[0023] And / or,

[0024] The stator teeth are arranged at equal intervals along the circumference of the stator core.

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

[0026] Optionally, the stator core body is formed by stacking multiple stator laminations along the axial direction of the stator core;

[0027] The stator lamination includes a stator lamination yoke and a plurality of stator lamination teeth. The stator lamination yoke is annular, and the plurality of stator lamination teeth are connected to the outer periphery of the stator lamination yoke along the circumferential direction of the stator lamination.

[0028] A stator lamination slot is formed between adjacent stator lamination teeth in each stator lamination. In a plurality of stator laminations, all stator lamination yokes are stacked to form a stator yoke. All stator lamination teeth located on the same straight line constitute a stator tooth. All stator lamination slots located on the same straight line constitute a stator slot.

[0029] Optionally, the width of the stator lamination groove gradually increases from the inside to the outside along the radial direction of the stator lamination.

[0030] Optionally, each of the stator lamination teeth is provided with a socket at its radially outer end. Among the plurality of stator laminations, all the sockets located on the same straight line form the slot, and the radially outer end openings of all the sockets located on the same straight line form the first opening.

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

[0032] Optionally, the connecting plate and the slot wall are either transition-fitted or interference-fitted.

[0033] Optionally, it may also include a plurality of fixing bars, which are connected between the stator tooth tip bodies of adjacent stator tooth tips.

[0034] Optionally, the fixing bar includes two stator teeth on both sides of the fixing bar, with the stator tooth body of one stator tooth facing the fixing bar inserted into the first slot, and the stator tooth body of the other stator tooth facing the fixing bar inserted into the second slot.

[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 connects one side of the first outer radial surface and one side of the first inner radial surface. A first outer oblique cut surface is provided on one side of the radial outer surface of the fixed tooth tip body along the circumferential direction of the stator core, and a first inner oblique cut surface is provided on one side of the radial inner surface of the fixed tooth tip body along the circumferential direction of the stator core. The first outer oblique cut surface gradually slopes towards the radial inner side of the stator core from its center to its edge. The first inner oblique cut surface gradually slopes towards the radial outer side of the stator core from its center to its edge. The first outer oblique cut surface fits against the first outer radial surface, and the first inner oblique cut surface fits against 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 connects one side of the second outer radial surface and one side of the second inner radial surface. A second outer oblique surface is provided on the radially outer surface of the fixed tooth tip body along the other side of the circumference of the stator core, and a second inner oblique surface is provided on the radially inner surface of the fixed tooth tip body along the other side of the circumference of the stator core. The second outer oblique surface gradually slopes towards the radially inner side of the stator core from the center of the radially outer surface of the fixed tooth tip body towards its edge; the second inner oblique surface gradually slopes towards the radially outer side of the stator core from the center of the radially outer surface of the fixed tooth tip body towards its edge; the second outer oblique surface fits against the second outer radial surface, and the second inner oblique surface fits against the second inner radial surface.

[0038] On the other hand, embodiments of the present invention provide a stator assembly, including a stator winding and the aforementioned stator core, wherein a stator winding is disposed in each stator slot.

[0039] Optionally, each of the stator windings is wound around the outside of the corresponding stator tooth, and an insulation structure is provided between the stator winding and the stator tooth.

[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, which is disposed between the stator winding and the stator teeth;

[0043] or,

[0044] The insulating structure includes insulating adhesive, which is disposed between the stator winding and the stator teeth;

[0045] or,

[0046] The insulating structure includes an insulating coating, which is disposed on two opposing side surfaces of the stator teeth along the circumferential direction of the stator core.

[0047] or,

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

[0049] The stator assembly provided in this embodiment of the invention has all the advantages of the stator core described above.

[0050] In another aspect, embodiments of the present invention also provide an electric motor, including a housing, a rotor assembly and the aforementioned stator assembly, wherein the stator assembly and the rotor assembly are disposed within the housing.

[0051] The motor can be an internal rotor motor, meaning the rotor assembly is located inside the stator assembly; or it can be an external rotor motor, meaning the rotor assembly is located outside the stator assembly.

[0052] The motor provided in this embodiment of the invention has all the advantages of the stator core described above.

[0053] In another aspect, embodiments of the present invention also provide a means of transportation, including the aforementioned motor.

[0054] The transportation vehicle provided in this embodiment of the invention has all the advantages of the stator core described above.

[0055] Means of transportation, such as aircraft, vehicles, etc. Attached Figure Description

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

[0057] Figure 2 yes Figure 1 Enlarged view of point a in the middle;

[0058] Figure 3 This is a schematic diagram of the stator core of the stator assembly provided in the first embodiment of the present invention;

[0059] Figure 4 This is a schematic diagram of the stator core body of the stator assembly provided in the first embodiment of the present invention;

[0060] Figure 5 This is an enlarged view of the stator tooth tip of the stator core of the stator assembly provided in the first embodiment of the present invention;

[0061] Figure 6 This is an enlarged view of the fixing bar of the stator core of the stator assembly provided in the first embodiment of the present invention.

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

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

[0064] 1. Stator core body; 11. Stator yoke; 12. Stator teeth; 121. Slot; 1211. First opening; 1212. Arc-shaped bottom wall; 13. Stator slot; 14. Stator lamination; 141. Stator lamination yoke; 142. Stator lamination teeth; 1421. Insertion hole; 143. Stator lamination slot;

[0065] 2. Stator tooth tip; 21. Stator tooth tip body; 211. First outer oblique cut surface; 212. First inner oblique cut surface; 213. Second outer oblique cut surface; 214. Second inner oblique cut surface; 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

[0068] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention 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 merely illustrative and are not intended to limit the invention.

[0069] First Embodiment

[0070] See Figures 1 to 6The stator assembly provided in the first embodiment of the present invention 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 11 and a plurality of stator teeth 12. The plurality of stator teeth 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 teeth 12. A stator winding 20 is disposed in each stator slot 13. The stator tooth tips 2 are disposed independently of the stator core body 1, and a stator tooth tip 2 is fixed on the radial outer side of each stator tooth 12.

[0071] See Figures 3 to 5 Each of the stator teeth 12 is provided with a slot 121 at its radially outer end. 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 being formed at one end of the slot 121 along its length and the third opening being formed at the other end of the slot 121 along its length.

[0072] Each stator lamination tooth 142 has a socket 1421 at its radially outer end. All the sockets 1421 of the plurality of stator laminations 14 located on the same straight line form the slot 121. The radially outer end openings of all the sockets 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 or acute angle. The connecting plate 22 is inserted into the slot 121 through the first opening 1211. The two sides of the stator tooth tip body 21 along the circumferential direction of the stator core 10 protrude from the two sides 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 stator tooth tip 2 and the stator tooth portion 12 can be installed and positioned.

[0074] See Figure 4The straight line direction from the radial inner end to the radial outer end of the slot 121 is defined as the inner and outer extension direction A of the slot 121, and the direction from the radial inner end to the radial outer end of the stator tooth 12 is defined as the inner and outer extension direction B of the stator tooth 12. In the same group of stator teeth 12 and stator tooth tips 2 (one stator tooth 12 and its connected stator tooth tip 2 constitute a group), the angle between the stator tooth tip body 21 and the slot 121 is equal to the angle b between the stator tooth tip body 21 and the connecting plate 22. Preferably, in the same group of stator teeth 12 and stator tooth tips 2, the inner and outer extension direction A of the slot 121 is consistent with the inner and outer extension direction of the connecting plate 22. In this way, the slot 121 and the connecting plate 22 fit each other in shape, and the connecting plate 22 is not easy to loosen after being inserted into the slot 121.

[0075] The inner and outer extension direction A of slot 121 and the inner and outer extension direction B of stator tooth 12 form a non-zero angle c. The stator winding 20 is elastic, and the outer end of the stator winding 20 can apply an outward elastic force to the radially inner surface of the stator tooth tip body 21. Since the angle between the stator tooth tip body 21 and the connecting plate 22 is an obtuse or acute angle, under the outward elastic force of the stator winding 20, the connecting plate 22 applies pressure to the slot wall of slot 121, making it difficult for the connecting plate 22 to come out of slot 121, thus ensuring the connection strength of the stator tooth tip 2.

[0076] Furthermore, during the assembly of the stator core 10, copper wire can be wound first on the stator teeth 12. After the winding is completed to form the stator winding 20, the stator tooth tops 2 are then installed. In this way, since the stator tooth tops 2 are not yet installed during copper wire winding, the radial outer opening of the stator slot 13 is much larger than the existing stator slot width, facilitating the winding of copper wire on the stator teeth and making it easier to achieve high slot fill factor, thus achieving a high slot fill factor for the motor. Additionally, this allows for the formation of a stator assembly with less leakage flux, which is more conducive to improving motor performance.

[0077] In addition, since the stator tooth tip 13 is independently set, it can be made of a lighter material, and the deformation and vibration caused by the force are relatively small. The outer circle of the stator core 10 does not need to be fitted with a sheath or other means to increase the rigidity.

[0078] In addition, motors with high slot fill factor have the following advantages:

[0079] (1) The motor can achieve higher torque, thus increasing the motor torque and power density.

[0080] (2) The motor resistance decreases and the motor efficiency is significantly improved.

[0081] (3) The heat dissipation of the motor stator winding is enhanced, reducing the temperature rise of the motor.

[0082] (4) The size of 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 teeth 12 extend along a second straight line parallel to the axis of the stator core 10.

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

[0086] The stator slots 13 are arranged at equal intervals along the circumference of the stator core 10; the stator teeth 12 are arranged at equal intervals along the circumference of the stator core; and the tips of the stator teeth 12 are arranged at equal intervals along the circumference of the stator core 10.

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

[0088] The stator core body 11 is formed by stacking multiple stator laminations 14 along the axial direction of the stator core 10. Each stator lamination 14 includes a stator lamination yoke 141 and multiple stator lamination teeth 142. The stator lamination yoke 141 is annular, and the multiple stator lamination teeth 142 are connected to the outer periphery of the stator lamination yoke 141 along the circumferential direction of the stator lamination 14. A stator lamination slot 143 is formed between adjacent stator lamination teeth 142 of each stator lamination 14. Among the multiple stator laminations 14, all the stator lamination yokes 141 are stacked to form the stator yoke 11, all the stator lamination teeth 142 located on the same straight line constitute the stator teeth 12, and all the stator lamination slots 143 located on the same straight line constitute the stator slots 13.

[0089] In the prior art, the stator lamination 14 is an integral structure, that is, the stator lamination yoke 141, the stator lamination tooth 142, and the stator lamination tooth tip are an integral structure, and multiple stator laminations 14 are stacked to form the stator core 10. The stator core 10 of the embodiment of the present invention has a completely different structure. The stator lamination yoke 141 and the stator lamination tooth 142 are an integral structure, and the stator laminations 14 do not have stator lamination tooth tips. Instead, an integral stator tooth tip 2 is used to replace the structure of multiple stator lamination tooth tips stacked together, resulting in a significant structural difference.

[0090] See Figure 4Along the radial direction of the stator lamination 14, the width of the stator lamination groove 143 gradually increases from the inside to the outside. In this way, the outer end opening of the stator lamination groove 143 is relatively large, which is beneficial for the winding of copper wire.

[0091] The stator lamination teeth 142 protrude radially from the stator lamination yoke 141. That is, a plurality of stator lamination teeth 142 are arranged radially around the center of the stator lamination 14.

[0092] Each stator lamination tooth 142 has a socket 1421 at its radially outer end. All the sockets 1421 of the plurality of stator laminations 14 located on the same straight line form the slot 121. The radially outer end openings of all the sockets 1421 located on the same straight line form the first opening 1211.

[0093] The radially inner surface of the stator tooth tip body 21 is bonded to the radially outer surface of the stator tooth portion 12. This increases the connection strength between the stator tooth tip 2 and the stator tooth portion 12.

[0094] The connecting plate 22 is either transitionally fitted or interference-fitted 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 the inside out; that is, adjacent slots 121 are in a figure-eight shape.

[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 the inside out. That is, adjacent slots 121 form an inverted V-shape.

[0097] That is, any one of the slots 121 is in a figure-eight shape with the slot 121 adjacent to it on one side, and in an inverted figure-eight shape with the slot 121 adjacent to it on the other side.

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

[0099] See Figure 4 and Figure 5The connecting plate 22 has an arc-shaped surface 221 at its end, and the bottom wall of the slot 121 is an arc-shaped bottom wall 1212. The arc-shaped surface 221 fits into the arc-shaped bottom wall 1212. This ensures that the end of the connecting plate 22 matches the shape of the bottom wall of the slot 121, and the bottom wall of the slot 121 covers the end of the connecting plate 22, resulting in a tighter fit between the connecting plate 22 and the slot 121.

[0100] See Figure 2 and Figure 6 It also includes multiple fixing strips 3, which are connected between the stator tooth tip bodies 21 of adjacent stator tooth tips 2.

[0101] The fixing bar 3 includes a first latch 31 and a second latch 32 spaced apart along the circumferential direction of the stator core 10. Two stator tooth tips 2 are located on either side of the fixing bar 3. The side of the stator tooth tip body 21 of one stator tooth tip 2 facing the fixing bar is inserted into the first latch 31, while the side of the stator tooth tip body 21 of the other stator tooth tip 2 facing the fixing bar 3 is inserted into the second latch 32. In this way, the fixing bar can restrict the circumferential displacement of the stator tooth tips 2.

[0102] The fixing bar 3 can press the stator winding 20. The fixing bar 3 will be subjected to an outward radial force. The fixing bar 3 contacts the stator tooth tip body 21 of the two adjacent stator tooth tips 2, so that the fixing bar 3 will give the stator tooth tip 2 an outward radial force. Furthermore, along the circumferential direction of the stator core 10, the connecting plates 22 of the adjacent stator tooth tips 2 are symmetrically arranged with respect to the stator slot 13 between them; along the circumferential direction of the stator core 10, the slots 121 are symmetrically arranged with respect to the stator slot 13 between them. Any one of the slots 121 is V-shaped with the slot 121 adjacent to it on one side and V-shaped with the slot 121 adjacent to it on the other side. The two adjacent slots 121 are not parallel (there is an angle between them), which will hinder the radial sliding of the fixing bar 3 and the stator tooth tip 13, thereby realizing the mutual limiting of the stator winding 20, the stator tooth tip 2 and the fixing bar 3. The stator winding 20, the stator tooth tip 2 and the fixing bar 3 have no radial and circumferential displacement, which can completely fix the stator tooth tip 2 and improve the overall rigidity of the stator core 10.

[0103] See Figure 5 and Figure 6The 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 connects one side of the first outer radial surface 311 and one side of the first inner radial surface 312. The radial outer surface of the stator tooth tip body 21 has a first outer oblique cut surface 211 on one side along the circumferential direction of the stator core 10, and the radial inner surface of the stator tooth tip body has a first outer oblique cut surface 211 on one side along the circumferential direction of the stator core 10. A first inner oblique cut surface 212 is provided on one side of the core 10 in the circumferential direction; the first outer oblique cut surface 211 gradually slopes towards the radially inner side of the stator core 10 from the center of the radially outer surface of the stator tooth tip body 21 towards its edge; the first inner oblique cut surface 212 gradually slopes towards the radially outer side of the stator core 10 from the center of the radially outer surface of the stator tooth tip body 21 towards its edge; the first outer oblique cut surface 211 is in contact with the first outer radial surface 311, and the first inner oblique cut surface 212 is in contact with the first inner radial surface 312. The first circumferential surface 313 abuts against one 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 connects one side of the second outer radial surface 321 and one side of the second inner radial surface 322. The radial outer surface of the fixed tooth tip body 21 is provided with a second outer oblique surface 213 on the other side of the circumferential direction of the stator core 10, and the radial inner surface of the fixed tooth tip body 21 is provided with a second outer oblique surface 213 on the other side of the circumferential direction of the stator core 10. A second inner oblique surface 214 is provided on the other side of the stator core 10 in the circumferential direction; the second outer oblique surface 213 gradually slopes towards the radially inner side of the stator core 10 from the center of the radially outer surface of the stator tooth tip body 21 towards its edge; the second inner oblique surface 214 gradually slopes towards the radially outer side of the stator core 10 from the center of the radially outer surface of the stator tooth tip body 21 towards its edge; the second outer oblique surface 213 is in contact with the second outer radial surface 321, and the second inner oblique surface 214 is in contact with the second inner radial surface 322. The second circumferential surface 323 abuts against the other end face of the stator tooth tip body 21.

[0105] The width of the first outer oblique cut surface 211 is greater than the width of the first outer radial surface 311, so that a portion of the surface of the first outer oblique cut surface 211 is exposed. The width of the second outer oblique cut surface 213 is greater than the width of the second outer radial surface 321, so that a portion of the surface of the second outer oblique cut surface 213 is exposed. In this way, by setting the first outer oblique cut surface 211 and the second outer oblique cut surface 213, the air gap magnetic flux density of the motor is adjusted and improved, motor harmonics are reduced, the no-load back EMF is made more sinusoidal, and motor losses are reduced.

[0106] The width of the first inner oblique cut surface 212 is greater than the width of the first inner radial surface 312, so that a portion of the surface of the first inner oblique cut surface 212 is exposed. The width of the second inner oblique cut surface 214 is greater than the width of the second inner radial surface 322, so that a portion of the surface of the second outer oblique cut surface 213 is exposed. In this way, by setting the first inner oblique cut surface 212 and the second inner oblique cut surface 214, the air gap magnetic flux density of the motor can be adjusted and improved, motor harmonics can be reduced, the no-load back EMF can be made more sinusoidal, and motor losses can be reduced.

[0107] See Figure 2 Each of the stator windings 20 is wound around the outside of the corresponding stator tooth 12, and an insulation structure 4 is provided between the stator windings 20 and the stator tooth 12.

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

[0109] In another alternative embodiment, the insulation structure 4 includes a rubber pad disposed between the stator winding 20 and the stator teeth 12.

[0110] In another alternative embodiment, the insulating structure 4 includes an insulating adhesive disposed between the stator winding 20 and the stator teeth 12.

[0111] In another alternative embodiment, the insulating structure 4 includes an insulating coating disposed on opposite side surfaces of the stator teeth 12 spaced apart along the circumferential direction of the stator core 10.

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

[0113] Second Embodiment

[0114] The stator assembly provided in the second embodiment of the present invention differs from that in the first embodiment in that the fixing strip is removed.

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

[0116] Third Embodiment

[0117] The stator assembly provided in the fifth embodiment of the present invention differs from that in the first embodiment in that the fixing strip is removed, and adhesive tape is used to fix the stator tooth top to the radial outer end face of the stator tooth portion.

[0118] Fourth embodiment

[0119] The stator assembly provided in the fifth embodiment of the present invention differs from that in the first embodiment in that the fixing strip is eliminated, and a clamping member is used to press the outer peripheral surface of the stator tooth tip to fix the stator tooth tip on the radial outer end face of the stator tooth.

[0120] In addition, embodiments of the present invention also provide an electric motor, including a housing, a rotor assembly and a stator assembly as described in the above embodiments, wherein the stator assembly and the rotor assembly are disposed in the housing.

[0121] The motor can be an internal rotor motor, meaning the rotor assembly is located inside the stator assembly; or it can be an external rotor motor, meaning the rotor assembly is located outside the stator assembly.

[0122] The motor provided in this embodiment of the invention has all the advantages of the stator core 10 of the above embodiments.

[0123] In addition, embodiments of the present invention also provide a means of transportation, including the motor described in the above embodiments.

[0124] The vehicle provided in this embodiment of the invention has all the advantages of the stator core 10 described above.

[0125] Transportation vehicles, such as aircraft and vehicles, can be used. For aircraft, the motor described in the above embodiment can increase the motor's output power and torque while maintaining the original weight and size requirements, enabling the aircraft to bear a greater load.

[0126] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stator core (10), characterized in that, The stator core body (1) includes a stator core body (1) and a plurality of stator tooth tips (2). The stator core body (1) includes a stator yoke (11) and a plurality of stator teeth (12). The plurality of stator teeth (12) are connected to the outer periphery of the stator yoke (11) along the circumferential direction of the stator core (10). A stator slot (13) is formed between adjacent stator teeth (12). Each stator tooth (12) is provided with a slot (121) at its radially outer end. The slot (121) has a first opening (1211) facing the radially outer side of the stator core. 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 angle 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).

2. The stator core (10) according to claim 1, characterized in that, In the same group of stator teeth (12) and stator tooth tips (2), the angle between the stator tooth tip body (21) and the slot (121) is equal to the angle between the stator tooth tip 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), the adjacent slots (121) gradually approach the stator slot (13) between the two slots (121) from the inside out; or, Along the circumferential direction of the stator core (10), the adjacent slots (121) gradually move away from the stator slot (13) between the two slots (121) from the inside out.

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 tips (2) are symmetrically arranged about 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.

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 teeth (12) extend along a second straight line parallel to the axis of the stator core (10); And / or, The stator tooth tip (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 teeth (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 tip (2) is an integral structure.

8. The stator core (10) according to claim 1, characterized in that, The stator core body (1) is formed by stacking multiple stator laminations (14) along the axial direction of the stator core (10); The stator lamination (14) includes a stator lamination yoke (141) and a plurality of stator lamination teeth (142). The stator lamination yoke (141) is annular, and the plurality of stator lamination teeth (142) are connected to the outer periphery of the stator lamination yoke (141) along the circumferential direction of the stator lamination (14). A stator lamination slot (143) is formed between adjacent stator lamination teeth (142) of each stator lamination (14). Among the plurality of stator laminations (14), all stator lamination yokes (141) are stacked to form a stator yoke (11). All stator lamination teeth (142) located on the same straight line constitute a stator tooth (12). All stator lamination slots (143) located on the same straight line constitute a stator slot (13).

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

10. The stator core (10) according to claim 8, characterized in that, Each stator lamination tooth (142) has a socket (1421) at its radial outer end. Among the multiple stator laminations (14), all the sockets (1421) located on the same straight line form the slot (121), and the radial outer end openings of all the sockets (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 (12).

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

13. The stator core (10) according to claim 1, characterized in that, It also includes multiple fixing bars (3), which 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) includes a first latch (31) and a second latch (32) spaced apart from each other along the circumferential direction of the stator core. Two stator tooth tips (2) on both sides of the fixing bar (3) are provided. The side of the stator tooth tip body (21) of one stator tooth tip (2) facing the fixing bar (3) is inserted into the first latch (31), and the side of the stator tooth tip body (21) of the other stator tooth tip (2) facing the fixing bar (3) is inserted into the second latch (32).

15. The stator core (10) according to claim 14, characterized in that, 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) connects one side of the first outer radial surface (311) and one side of the first inner radial surface (312). The radial outer surface of the fixed tooth tip body (21) is provided with a first outer oblique surface (211) along one side of the circumferential direction of the stator core (10), and the radial inner surface of the fixed tooth tip body (21) is provided with a first outer oblique surface (211) along the circumferential direction of the stator core (10). A first inner oblique surface (212) is provided on one side of the iron core (10) in the circumferential direction; the first outer oblique surface (211) gradually slopes towards the radial inner side of the stator iron core (10) from the center of the radial outer surface of the fixed tooth tip body (21) to its edge; the first inner oblique surface (212) gradually slopes towards the radial outer side of the stator iron core (10) from the center of the radial outer surface of the fixed tooth tip body (21) to its edge; the first outer oblique surface (211) is in contact with the first outer radial surface (311), and the first inner oblique surface (212) is in contact with the first inner radial surface (312); And / or, 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) connects one side of the second outer radial surface (321) and one side of the second inner radial surface (322). The radial outer surface of the fixed tooth tip body (21) is provided with a second outer oblique surface (213) on the other side of the circumferential direction of the stator core (10), and the radial inner surface of the fixed tooth tip body (21) is provided with a second outer oblique surface (213) on the other side of the circumferential direction of the stator core (10). A second inner oblique surface (214) is provided on the other side of the circumference of the iron core (10); the second outer oblique surface (213) gradually inclines from the center of the radial outer surface of the fixed tooth tip body (21) toward its edge toward the radial inner side of the stator iron core (10); the second inner oblique surface (214) gradually inclines from the center of the radial outer surface of the fixed tooth tip body (21) toward its edge toward the radial outer side of the stator iron core (10); the second outer oblique surface (213) is in contact with the second outer radial surface (321), and the second inner oblique surface (214) is in contact with the second inner radial surface (322).

16. A stator assembly, characterized in that, It includes a stator winding (20) and a stator core (10) as described in any one of claims 1-15, wherein a stator winding (20) is provided in each stator slot (13).

17. The stator assembly according to claim 16, characterized in that, Each of the stator windings (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 insulation structure (4) includes insulating paper, which is disposed between the stator winding (20) and the stator teeth (12); or, The insulation structure (4) includes a rubber pad disposed between the stator winding (20) and the stator teeth (12); or, The insulation structure (4) includes insulating adhesive, which is disposed between the stator winding (20) and the stator teeth (12); or, The insulating structure (4) includes an insulating coating, which is disposed on the opposite two side surfaces of the stator teeth (12) spaced apart along the circumferential direction of the stator core (10); or, The insulation structure (4) includes an insulating coating disposed on the outer surface of the stator winding (20).

19. An electric motor, characterized in that, It includes a housing, a rotor assembly, and a stator assembly as described in any one of claims 16-18, wherein the stator assembly and the rotor assembly are disposed within the housing.

20. A means of transportation, characterized in that, Includes the motor as described in claim 19.

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