Stator core, stator, motor and vehicle

Abstract

The invention discloses a stator core, a stator, a motor and a vehicle, the stator core is provided with a stator yoke part and a plurality of stator tooth parts, the plurality of stator tooth parts are connected with the stator yoke part and are distributed along the circumferential direction of the stator yoke part, the end face of the stator yoke part is provided with a plurality of first oil injection holes and a plurality of second oil injection holes, and the first oil injection holes and the second oil injection holes are distributed along the circumferential direction of the stator yoke part. The plurality of first oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are arranged around the periphery of the plurality of first oil injection holes, and the oil injection directions of the plurality of first oil injection holes and the plurality of second oil injection holes are inclined towards the stator tooth part. According to the stator iron core provided by the embodiment of the invention, the plurality of first oil injection holes are matched with the plurality of second oil injection holes, so that the cooling oil can be directly injected to the winding, the oil is injected to different positions of the winding, the contact area between the cooling oil and the winding is increased, and the heat dissipation effect on the winding is improved.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to a stator core, a stator, an electric motor, and a vehicle. Background Technology

[0002] During the operation of an electric motor, the stator winding is one of the main heat-generating components. The increasing demands for high speed and high power density in electric motors place higher requirements on the heat dissipation of the stator. The heat dissipation effect of the stator winding affects the lifespan of the insulation material and the operational reliability of the motor. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one object of this invention is to provide a stator core that improves heat dissipation from the windings and enhances the operational reliability of the motor.

[0004] Another object of the present invention is to provide a stator comprising the aforementioned stator core.

[0005] Another object of the present invention is to provide an electric motor including the aforementioned stator.

[0006] Another object of the present invention is to provide a vehicle including the aforementioned motor.

[0007] According to an embodiment of the present invention, the stator core has a stator yoke and a plurality of stator teeth. The plurality of stator teeth are connected to the stator yoke and are distributed circumferentially along the stator yoke. The end face of the stator yoke is provided with a plurality of first oil injection holes and a plurality of second oil injection holes. The plurality of first oil injection holes are distributed circumferentially, and the plurality of second oil injection holes are distributed circumferentially. The plurality of second oil injection holes surround the plurality of first oil injection holes, and the oil injection direction of the plurality of first oil injection holes and the plurality of second oil injection holes is inclined toward the stator teeth.

[0008] According to an embodiment of the present invention, the stator core, by providing a plurality of first oil spray holes and a plurality of second oil spray holes in combination, can directly spray cooling oil onto the windings, and facilitates oil spraying at different positions of the windings, increasing the contact area between the cooling oil and the windings, improving the heat dissipation effect on the windings, and thus improving the reliability of motor operation.

[0009] In addition, the stator core according to the above embodiments of the present invention may also have the following additional technical features:

[0010] In some embodiments, the outer peripheral surface of the stator core is provided with an oil groove, and the first oil spray hole is connected to the oil groove; the second oil spray hole is connected to the oil groove.

[0011] In some embodiments, the inlet of the first oil injection hole is opposite to the oil groove along the axial direction of the stator core.

[0012] In some embodiments, the stator core includes a plurality of first laminations disposed at the ends of the stator core. Each first lamination has a first through hole, which is connected to form a first oil injection hole. The first through hole near the end face of the stator core is closer to the axis of the stator core than the first through hole away from the end face of the stator core.

[0013] In some embodiments, the total thickness of the plurality of first laminations is d, the distance of the line connecting the centers of the openings at both ends of the first oil injection hole along the axis of the stator core is h1, the distance from the outer periphery of the first lamination to the outermost layer of the winding is H1, and the distance from the winding protruding from the end face of the stator core is A, wherein H1 / D < h1 / d.

[0014] In some embodiments, the projection of the second oil injection hole along the axis of the stator core is closer to the stator teeth than the oil groove.

[0015] In some embodiments, the stator core includes a plurality of first laminations disposed at the ends of the stator core. Each first lamination has a second through hole, which is connected to form a second oil injection hole. The second through hole near the end face of the stator core is closer to the axis of the stator core than the second through hole far from the end face of the stator core.

[0016] In some embodiments, the total thickness of the plurality of first laminations is d, and in the projection along the axis of the stator core, the distance between the second through hole of the first lamination on the end face of the stator core and the second through hole of the first lamination facing away from the end face of the stator core is h2, the distance from the second oil injection hole to the outer surface of the winding is H2, and the winding is arched on the end face of the stator core, the height of the arched protrusion is D, wherein h2 / d < H2 / D.

[0017] In some embodiments, the stator core further includes a plurality of second laminations, the second laminations being disposed in the middle of the stator core, the second laminations having a third through hole, the third through hole communicating with the second through hole and penetrating through the outer periphery of the second lamination to communicate with the oil groove.

[0018] In some embodiments, the stator core further includes a plurality of third laminations, the third laminations being disposed between the first laminations and the second laminations, and the third laminations having a fourth through hole that connects the second through hole and the third through hole.

[0019] In some embodiments, the outer peripheral surface of the third lamination is provided with a first turbulence protrusion, and the outer peripheral surface of the second lamination is provided with a second turbulence protrusion. In the projection along the axis of the stator core, the protrusion height of the second turbulence protrusion is less than the protrusion height of the first turbulence protrusion.

[0020] In some embodiments, the oil tank is provided with turbulence protrusions to create a meandering channel within the oil tank.

[0021] In some embodiments, the stator core includes a central lamination located in the middle and end laminations located at the ends. The central lamination includes an annular portion, a plurality of toothed portions, and a plurality of protrusions. The periphery of the annular portion is shorter than the periphery of the end laminations. The plurality of toothed portions are located on the inner edge of the annular portion, and the protrusions are located on the outer edge of the annular portion. The line connecting the midpoint of the toothed portion along the circumferential direction to the midpoint of the lamination is L1, and the line connecting the midpoint of an adjacent toothed portion along the circumferential direction to the midpoint of the lamination is L2. The protrusions are staggered from the lines L1 and L2.

[0022] In some embodiments, a winding groove is provided between adjacent stator teeth, and the plurality of second oil injection holes are divided into a plurality of oil injection hole groups corresponding to the plurality of winding grooves respectively.

[0023] The injection hole group includes at least one second injection hole; or the injection hole group includes two symmetrical second injection holes.

[0024] In some embodiments, the circumferential dimension of the second injection hole is not greater than half the circumferential dimension of the winding groove.

[0025] In some embodiments, the second oil injection hole gradually tilts outward along the circumference of the stator core.

[0026] In some embodiments, adjacent second injection holes are inclined toward each other or toward each other in an axially outward direction.

[0027] According to an embodiment of the present invention, a stator includes: a winding and the aforementioned stator core, wherein the winding is mounted on the stator teeth.

[0028] According to an embodiment of the present invention, an electric motor includes an oil pump and the aforementioned stator, wherein the oil pump is configured to drive cooling oil to be sprayed from the plurality of first oil injection holes and the plurality of second oil injection holes onto the windings.

[0029] The vehicle according to an embodiment of the present invention includes the aforementioned motor.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present application. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the stator core according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the stator core from another direction according to an embodiment of the present invention.

[0033] Figure 3 yes Figure 2 Enlarged view of point B in the middle circle.

[0034] Figure 4 This is an exploded schematic diagram of multiple first laminations of the stator core according to an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the assembly of multiple first laminations of the stator core according to an embodiment of the present invention, showing the positional changes of multiple first through holes and multiple second through holes.

[0036] Figure 6 yes Figure 5 Enlarged view of point C in the middle circle.

[0037] Figure 7 This is a schematic diagram of the first lamination furthest from the end of the stator core in an embodiment of the present invention.

[0038] Figure 8 This is a schematic diagram of the first lamination near the end of the stator core according to an embodiment of the present invention.

[0039] Figure 9 This is a schematic diagram of the first lamination and winding of the stator core according to an embodiment of the present invention, showing the oil injection angle of the first oil injection hole.

[0040] Figure 10 This is a schematic diagram of the first lamination and winding of the stator core in some other embodiments of the present invention, showing the oil injection angle of the second oil injection hole.

[0041] Figure 11 This is a schematic diagram of the second lamination of the stator core according to an embodiment of the present invention.

[0042] Figure 12 This is a schematic diagram of the third lamination of the stator core according to an embodiment of the present invention.

[0043] Figure 13 This is a schematic diagram of the stator core in another direction according to an embodiment of the present invention.

[0044] Figure 14 This is a partial cross-sectional schematic diagram of the stator core according to an embodiment of the present invention.

[0045] Figure 15This is a schematic diagram of the second oil injection hole and winding groove of the stator core in an embodiment of the present invention.

[0046] Figure 16 This is a schematic diagram of the stator winding according to an embodiment of the present invention.

[0047] Figure label:

[0048] Stator core 100, stator yoke 10, stator tooth 20, winding groove 21, first oil injection hole 31, second oil injection hole 32, oil injection hole group 321, first lamination 41, first through hole 411, second through hole 412, second lamination 42, third through hole 421, second turbulence protrusion 422, third lamination 43, fourth through hole 431, first turbulence protrusion 432, annular part 441, toothed part 442, protrusion part 443, oil groove 50, winding 200. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0050] Combination Figures 1 to 3 According to an embodiment of the present invention, the stator core 100 can be applied to a motor. The stator core 100 has a stator yoke 10 and a plurality of stator teeth 20. The plurality of stator teeth 20 are connected to the stator yoke 10 and distributed circumferentially along the stator yoke 10. Specifically, the stator teeth 20 can be connected to the inner side of the stator yoke 10. The stator teeth 20 are used to fix the winding 200. The end face of the stator yoke 10 is provided with a plurality of first oil injection holes 31. The multiple first oil injection holes 31 and multiple second oil injection holes 32 can spray cooling oil. The spraying direction of the multiple first oil injection holes 31 and multiple second oil injection holes 32 is inclined towards the stator tooth section 20. In other words, the cooling oil can be sprayed onto the winding 200 of the stator tooth section 20, which can cool the winding 200 on the end face of the stator core 100. The method of directly spraying the oil onto the winding 200 for cooling can improve the cooling efficiency of the winding 200.

[0051] According to an embodiment of the present invention, the stator core 100 is provided with a plurality of first oil spray holes 31 and a plurality of second oil spray holes 32 on the end face of the stator yoke 10, and the oil spraying direction of the plurality of first oil spray holes 31 and the plurality of second oil spray holes 32 is inclined toward the stator tooth portion 20, so that cooling oil can be sprayed onto the winding 200, thereby improving the heat dissipation effect on the winding 200 at the end face of the stator core 100 and thus improving the operational reliability of the motor.

[0052] Combination Figure 1The multiple first oil injection holes 31 and multiple second oil injection holes 32 are distributed circumferentially along the stator yoke 10 so that the multiple first oil injection holes 31 and multiple second oil injection holes 32 can spray cooling oil circumferentially to uniformly dissipate heat from the winding 200 and improve the heat dissipation efficiency of the winding 200.

[0053] Furthermore, multiple second oil injection holes 32 are arranged around the multiple first oil injection holes 31. In other words, the second oil injection holes 32 are closer to the stator tooth portion 20 than the first oil injection holes 31. The multiple first oil injection holes 31 and the multiple second oil injection holes 32 work together to spray two layers of cooling oil. Specifically, the multiple first oil injection holes 31 and the multiple second oil injection holes 32 are all distributed circumferentially. The oil spraying direction of the first oil injection holes 31 and the second oil injection holes 32 is inclined towards the stator tooth portion 20. The first oil injection holes 31 and the second oil injection holes 32 spray oil towards the winding 200, which can improve the heat dissipation effect on the winding 200. The multiple second oil injection holes 32 are arranged around the multiple first oil injection holes 31. That is to say, the distance between the first oil injection holes 31 and the second oil injection holes 32 and the winding 200 is different. They can be configured to spray oil to different positions on the winding, increasing the contact area between the cooling oil and the winding 200 and improving the heat dissipation effect on the winding 200.

[0054] The oil spraying direction of the multiple first oil spray holes 31 and the multiple second oil spray holes 32 is inclined towards the stator tooth portion 20. The oil spraying angle of the multiple first oil spray holes 31 and the multiple second oil spray holes 32 can be the same. In combination with the above, since the distance between the first oil spray holes 31 and the second oil spray holes 32 and the winding 200 is different, the first oil spray holes 31 and the second oil spray holes 32 can spray the cooling oil to different positions of the winding, increase the contact area between the cooling oil and the winding 200, and improve the heat dissipation effect on the winding 200. Of course, the spray angles of the multiple first oil spray holes 31 and the multiple second oil spray holes 32 can also be different. For example, the spray angle of the first oil spray hole 31 can be smaller than that of the second oil spray hole 32. The first oil spray hole 31 is farther away from the winding 200 and has a smaller spray angle, so it can spray oil towards the outermost part of the stator winding 200. The second oil spray hole 32 is closer to the winding 200 and has a larger spray angle, so it can spray oil into the gaps of the stator winding 200. By coordinating the spraying of oil with the multiple first oil spray holes 31 and the multiple second oil spray holes 32, the contact area between the cooling oil and the winding 200 can be increased, thereby improving the heat dissipation effect on the winding 200.

[0055] The aforementioned oil injection angle is the angle between the straight line containing the cooling oil injection direction and the end face of the stator yoke 10, combined with... Figure 8 As shown, the injection angle of the first injection hole 31 can be α, combined with Figure 9 As shown, the injection angle of the second injection hole 32 can be β.

[0056] According to an embodiment of the present invention, the stator core 100, by providing a plurality of first oil spray holes 31 and a plurality of second oil spray holes 32 in cooperation, can directly spray cooling oil onto the winding 200, and facilitates oil spraying at different positions of the winding 200, increasing the contact area between the cooling oil and the winding 200, improving the heat dissipation effect on the winding 200, and thus improving the reliability of motor operation.

[0057] The stator core 100 may have a heat dissipation channel to dissipate heat from the stator. Multiple first oil injection holes 31 and multiple second oil injection holes 32 may be connected to the heat dissipation channel of the stator core 100. Cooling oil is sprayed out from the multiple first oil injection holes 31 and multiple second oil injection holes 32 through the heat dissipation channel to dissipate heat from the winding 200. The stator core 100 may have an outer heat dissipation channel, an inner heat dissipation channel, or both inner and outer heat dissipation channels to improve the heat dissipation efficiency of the stator. Multiple first oil injection holes 31 and multiple second oil injection holes 32 may be connected to the inner heat dissipation channel, or to the outer heat dissipation channel. Alternatively, multiple first oil injection holes 31 may be connected to the outer heat dissipation channel, and multiple second oil injection holes 32 to the inner heat dissipation channel. In other words, the multiple first oil injection holes 31 and multiple second oil injection holes 32 may be supplied with oil through different channels, all of which can spray cooling oil onto the winding 200. The oil spray direction inclined towards the winding 200 can improve the heat dissipation efficiency of the winding 200. The aforementioned outer channel may be located between the stator core 100 and the stator housing, and the inner channel may be located inside the stator core 100 near the stator teeth 20.

[0058] Combination Figure 1 In some embodiments of the present invention, an oil groove 50 is provided on the outer peripheral surface of the stator core 100. The first oil spray hole 31 is connected to the oil groove 50, and the second oil spray hole 32 is connected to the oil groove. In other words, oil can be supplied to the first oil spray hole 31 and the second oil spray hole 32 through the oil groove 50. When the cooling oil flows through the oil groove 50, it can dissipate heat from the stator. By setting the oil groove 50, the cooling oil is guided to flow along a predetermined path, thereby improving the heat dissipation effect on the stator. In addition, the cooling oil flows through the oil groove 50 and is sprayed from the first oil spray hole 31 and the second oil spray hole 32 onto the winding 200 to dissipate heat from the winding 200 and improve the operational reliability of the motor.

[0059] The inlet of the first oil injection hole 31 is opposite to the oil groove 50 along the axial direction of the stator core 100. In other words, the oil in the oil groove 50 can directly enter the inlet of the first oil injection hole 31 and be sprayed out from the first oil injection hole 31 and sprayed onto the winding 200. The inlet of the first oil injection hole 31 and the oil groove 50 are opposite to each other along the axial direction of the stator core 100, which can improve the oil injection efficiency of the first oil injection hole 31 and thus improve the cooling effect on the winding 200.

[0060] Furthermore, combined Figures 4 to 6The stator core 100 includes a plurality of first laminations 41, which are disposed at the ends of the stator core 100. The plurality of first laminations 41 can be stacked, and each first lamination 41 has a first through hole 411. The first through holes 411 of the plurality of first laminations 41 are connected to form a first oil injection hole 31. The distance between the first through hole 411 of the first lamination 41 near the end face of the stator core 100 and the axis of the stator core 100 is smaller than the distance between the first through hole 411 of the first lamination 41 far from the end face of the stator core 100 and the axis of the stator core 100. Specifically, the plurality of first laminations 41 are disposed at the ends of the stator core 100 and are stacked. The plurality of first laminations 41 can be disposed at the top or bottom of the stator core 100. In the projection direction along the axis of the stator core 100, the distance between the first through hole 411 on each first lamination 41 and the axis of the stator core 100 is different. In the extension direction from the middle of the stator core 100 to the end of the stator core 100, the distance between the first through hole 411 and the axis of the stator core 100 gradually decreases, so that multiple first through holes 411 can be connected to form a first oil injection hole 31 with an inclined flow channel. The cooling oil sprayed from the first oil injection hole 31 is inclined towards the stator tooth 20, so that the cooling oil can be sprayed onto the winding 200 wound on the stator tooth 20 to dissipate heat from the winding 200.

[0061] Combination Figure 7 and Figure 8 ,in Figure 7 The first lamination 41, shown, is the lamination furthest from the end face of the stator core 100. Figure 8 The first lamination 41 shown is located near the end face of the stator core 100, wherein the first through hole 411 on the first lamination 41 near the end face of the stator core 100 is closer to the stator tooth 20.

[0062] Among them, combined with the appendix Figure 9 The total thickness of the multiple first laminations 41 is d, the distance projected along the axis of the stator core 100 by the line connecting the centers of the openings at both ends of the first oil injection hole 31 is h1, the distance from the outer periphery of the first lamination to the outermost layer of the winding 200 is H1, and the distance from the winding 200 protruding from the end face of the stator core 100 is D, where H1 / D

[0063] Furthermore, combined Figures 4 to 6 ​The stator core 100 includes a plurality of first laminations 41, which are disposed at the ends of the stator core 100. Each first lamination 41 has a second through hole 412, which connects to form a second oil injection hole 32. The distance between the second through hole 412 of the first lamination 41 closest to the end face of the stator core 100 and the axis of the stator core 100 is less than the distance between the second through hole 412 of the first lamination 41 furthest from the end face of the stator core 100 and the axis of the stator core 100. Specifically, the plurality of first laminations 41 can be stacked, and each first lamination 41 has a second through hole 412, which connects to form a second oil injection hole 32. Specifically, in the projection direction along the axis of the stator core 100, the distance between the second through hole 412 of the first lamination 41 near the end face of the stator core 100 and the axis of the stator core 100 is less than the distance between the second through hole 412 of the first lamination 41 far from the end face of the stator core 100 and the axis of the stator core 100. Specifically, multiple first laminations 41 are disposed at the ends of the stator core 100 and are stacked. The multiple first laminations 41 can be disposed at the top or bottom of the stator core 100. The distance between the second through hole 412 on each first lamination 41 and the axis of the stator core 100 is different. In the direction of extension from the middle of the stator core 100 to the end of the stator core 100, the distance between the second through hole 412 and the axis of the stator core 100 gradually decreases, so that the multiple second through holes 412 can be connected to form a second oil spray hole 32 with an inclined flow channel. The cooling oil sprayed from the second oil spray hole 32 is inclined towards the stator tooth 20, so that the cooling oil can be sprayed onto the winding 200 wound on the stator tooth 20 to dissipate heat from the winding 200.

[0064] Combination Figure 7 and Figure 8 ,in Figure 7 The first lamination 41, shown, is the lamination furthest from the end face of the stator core 100. Figure 8 The first lamination 41 shown is located near the end face of the stator core 100, wherein the second through hole 412 on the first lamination 41 near the end face of the stator core 100 is closer to the stator tooth 20.

[0065] Among them, combined with the appendix Figure 10 and Figure 16, the total thickness of multiple first punching sheets 41 is d. In the projection along the axis of the stator core 100, the distance of the connection line of the center of the two ends of the second oil injection hole 32 projected along the axis of the stator core 100 is h2, the distance from the second oil injection hole 32 to the outer surface of the winding 200 is H2, and the winding 200 is arched and convex on the end face of the stator core 100, and the height of the arched convex is D. Among them, h2 / d < H2 / D to control the oil injection angle of the second oil injection hole 32, so that the cooling oil ejected from the second oil injection hole 32 can be sprayed onto the winding 200 and avoid the gap between the winding 200 and the stator core 100. After the cooling oil is sprayed onto the winding 200, it can enter the gaps of the winding 200, improving the heat exchange efficiency of the cooling oil and further enhancing the heat exchange effect on the winding 200.

[0066] Combined with Figure 11 and Figure 13 , in some embodiments of the present invention, the stator core 100 further includes multiple second punching sheets 42. The second punching sheets 42 are arranged in the middle of the stator core 100, and the second punching sheets 42 are provided with third through holes 421. The third through holes 421 communicate with the second through holes 412 and penetrate through the outer periphery of the second punching sheets 42 to communicate with the oil groove 50. Specifically, multiple second punching sheets 42 can be stacked to form the middle structure of the stator core 100, and an oil groove 50 is provided on the outer periphery of the stator core 100. The second through holes 412 and the oil groove 50 can be communicated through the third through holes 421. In other words, by providing the third through holes 421, the second oil injection holes 32 and the oil groove 50 can be communicated to facilitate the supply of oil to the second oil injection holes 32 through the oil groove 50.

[0067] Combined with Figure 12 and Figure 13 , in some embodiments of the present invention, the stator core 100 further includes multiple third punching sheets 43. The third punching sheets 43 are arranged between the first punching sheets 41 and the second punching sheets 42, and the third punching sheets 43 are provided with fourth through holes 431. The fourth through holes 431 communicate with the second through holes 412 and the third through holes 421. Among them, the fourth through holes 431 on multiple third punching sheets 43 can be connected to construct the inner flow channel of the stator, which can dissipate heat from the stator. And the third through holes 421 communicate with the outer peripheral surface of the stator core 100. Therefore, the oil groove 50 of the stator core 100 and the inner flow channel can be communicated through the third through holes 421. The third through holes 421 can be connected to construct a transition flow channel, which serves to flow the cooling oil in the oil groove 50 into the inner flow channel. In addition, the fourth through holes 431 communicate with the second through holes 412, and the second oil injection holes 32 constructed by the second through holes 412 can be supplied with oil through the inner flow channel constructed by the fourth through holes 431.

[0068] Specifically, the stator core 100 can be fixed in the motor housing. An outer stator flow channel is formed between the outer side of the stator core 100 and the inner wall of the motor housing. The outer stator flow channel is a meandering channel for the flow of cooling oil. The stator core 100 also includes an inner flow channel constructed by a fourth through hole 431. The outer flow channel and the inner flow channel are connected by a transition flow channel constructed by a third through hole 421. When the motor is working, the inner and outer flow channels can simultaneously supply oil to multiple first oil injection holes 31 and multiple second oil injection holes 32 to cool the winding 200. Specifically, the inner flow channel can supply oil to the second oil injection holes 32, and the outer flow channel can supply oil to the first oil injection holes 31. The cooling oil sprayed from the multiple first oil injection holes 31 and multiple second oil injection holes 32 is sprayed onto the winding 200 and flows out of the housing outlet under the action of gravity.

[0069] Furthermore, the radial dimension of the second through hole 412 is not greater than the radial dimension of the fourth through hole 431. For example, the second through hole 412 can be rectangular, and the fourth through hole 431 can also be rectangular. The radial dimensions of the second through hole 412 and the fourth through hole 431 can be the width dimension. The fourth through holes 431 on multiple third laminations 43 can be connected to form an inner flow channel, and the second through holes 412 can be connected to form a second oil injection hole 32. Oil can be supplied to the second oil injection hole 32 through the inner flow channel. The radial dimension of the second through hole 412 is smaller than the radial dimension of the fourth through hole 431, which can improve the speed and efficiency of the cooling oil sprayed from the second oil injection hole 32.

[0070] In some embodiments of the present invention, the oil tank is provided with turbulence protrusions to construct a meandering channel within the oil tank. Specifically, multiple turbulence protrusions can be staggered, and the multiple staggered protrusions can construct a meandering channel, which can turbulentize the cooling oil, improve the heat exchange efficiency between the cooling oil and the stator, improve the temperature distribution of the stator core, reduce local hot spots, and improve the operating stability of the motor.

[0071] Combination Figure 11 and Figure 12 In some embodiments of the present invention, the stator core includes a central lamination located in the middle and an end lamination located at the ends. The central lamination includes an annular portion 441, a plurality of toothed portions 442, and a plurality of protrusions 443. The periphery of the annular portion 441 is shorter than the periphery of the end lamination, so that the annular portion 441 and the plurality of protrusions 443 can form an oil groove structure, and facilitate the oil groove 50 to supply oil to the first oil injection hole 31 and the second oil injection hole 32 on the end face of the stator yoke 10.

[0072] The end lamination can be a first lamination 41, and the middle lamination can be a first lamination 42 or a third lamination 43. In other words, the second lamination 42 can have an annular portion 441, multiple toothed portions 442, and multiple protrusions 443, and the third lamination 43 can also have an annular portion 441, multiple toothed portions 442, and multiple protrusions 443. Alternatively, both the second lamination 42 and the third lamination 43 can have an annular portion 441, multiple toothed portions 442, and multiple protrusions 443. The multiple toothed portions 442 are located on the inner edge of the annular portion 441, and the protrusions 443 are located on the outer edge of the annular portion 441. The line connecting the midpoint of the toothed portion 442 along the circumferential direction to the midpoint of the lamination is L1, and the line connecting the midpoint of adjacent toothed portions 442 along the circumferential direction to the midpoint of the lamination is L2. The protrusions 443 are staggered from the lines L1 and L2. In this process, after multiple laminations are stacked to form the central structure of the stator core 100, multiple toothed portions 442 can be used to construct stator teeth 20 for fixing the winding 200, and multiple protrusions 443 can be used to construct oil grooves 50 for guiding the cooling oil flowing through the outside of the stator core 100 and improving the cooling efficiency of the cooling oil.

[0073] Specifically, the protrusions 443 are staggered from the connecting lines L1 and L2. Multiple central laminations can be positioned by the toothed portion 442. After the multiple central laminations are stacked, the protrusions 443 on different central laminations can be staggered along the axial direction of the stator core 100. The multiple staggered protrusions 443 can form an oil groove 50, which can turbulentize the cooling oil, improve the heat exchange efficiency between the cooling oil and the stator, improve the temperature distribution of the stator core 100, reduce local hot spots, and improve the operating stability of the motor. For example, when assembling multiple center stamps, rotating them by a certain angle can achieve staggered arrangement of the protrusions 443 on different center stamps, and positioning and alignment using the toothed portion 442; as another example, one center stamp can be placed first, and then another center stamp can be flipped over and stacked. Because the protrusions 443 are staggered from the connecting lines L1 and L2, the protrusions 443 on the center stamp placed on the front and the protrusions 443 on the center stamp placed on the back can be staggered. Multiple staggered protrusions 443 can construct an oil groove 50 with a turbulence effect.

[0074] When assembling the stator core 100, at least one middle lamination can be stacked to form the first lamination layer, wherein the protrusions 443 and the toothed portions 442 on the first lamination layer are aligned. Then, at least one middle lamination can be stacked to form the second lamination layer. The second lamination layer can be obtained by flipping the first lamination layer or by rotating the first lamination layer by a certain angle. During assembly, the toothed portions 442 can be used for positioning to ensure that the protrusions 443 on different lamination layers are staggered.

[0075] Optionally, the stator core 100 may include a plurality of first laminations 41, a plurality of second laminations 42, and a plurality of third laminations 43. The plurality of first laminations 41 may be stacked to form the end structure of the stator core 100, including a top structure and a bottom structure of the stator core 100. The plurality of second laminations 42 and third laminations 43 may be stacked to form an intermediate structure of the stator core 100. Specifically, the intermediate structure may include a plurality of first lamination layers, a plurality of second lamination layers, two third lamination layers, and two fourth lamination layers. Each first lamination layer may be formed by stacking a plurality of third laminations 43. The second lamination layers may be obtained by flipping the first lamination layers or by rotating the first lamination layers around the axis of the stator core 100 by a certain angle. The first lamination layers and the second lamination layers may be aligned by toothed portions 442, and the protrusions 443 may be staggered. The third lamination layer is formed by stacking the second lamination 42. The fourth lamination layer is obtained by flipping the third lamination layer or by rotating it around the axis of the stator core 100 by a certain angle. The two third lamination layers are sandwiched between the two fourth lamination layers. The third lamination layer and the fourth lamination layer can be positioned by the third through hole 421. In other words, the third through hole 421 on the third lamination layer and the fourth lamination layer are aligned so that the third through hole 421 can be connected to form a transition flow channel to connect the oil groove 50 and the second oil injection hole 32, so that oil can be supplied to the second oil injection hole 32 to cool the winding 200. The transition flow channel can also connect the oil groove 50 and the inner flow channel to facilitate heat dissipation inside the stator core 100.

[0076] Combination Figure 13 and Figure 14 In some embodiments of the present invention, the outer peripheral surface of the third lamination 43 is provided with a first turbulence protrusion 432, and the outer peripheral surface of the second lamination 42 is provided with a second turbulence protrusion 422. In the projection along the axis of the stator core 100, the protrusion height of the second turbulence protrusion 422 is less than the protrusion height of the first turbulence protrusion 432, which makes it easier for the cooling oil in the oil tank 50 to flow into the fourth through hole 431 through the third through hole 421. At the same time, it is easy to position during assembly and improves the assembly efficiency.

[0077] Among them, the first turbulence protrusion 432 on the outer peripheral surface of the third lamination 43 can abut against the inner peripheral surface of the stator housing to improve the assembly stability of the stator core 100 and the housing.

[0078] Combination Figure 11 and Figure 12In some embodiments of the present invention, the second punch 42 is provided with a third through hole 421, and the third punch 43 is provided with a fourth through hole 431. Alternatively, the second punch 42 may also be provided with a fourth through hole 431, and the number of fourth through holes 431 on the third punch 43 is twice the number of third through holes 421 on the second punch 42. The third through holes 421 and the fourth through holes 431 of the second punch 42 are arranged at intervals. Along the axial direction of the second punch 42, the fourth through holes 431 and the third through holes 421 penetrate the second punch 42. Along the circumferential direction of the second punch 42, the third through holes 421 and the fourth through holes 431 are arranged at intervals. The protrusions 443 are arranged at intervals and avoid the position of the third through holes 421. One end of the third through hole 421 near the toothed portion 442 corresponds to the fourth through hole 431 on the third punch 43. By arranging the third through hole 421 and the fourth through hole 431 at intervals on the second lamination 42, the fourth through hole 431 on the second lamination 42 and the third lamination 43 can be connected to form the inner flow channel of the stator core 100, which facilitates heat dissipation of the stator. The third through hole 421 can also connect the inner flow channel of the stator core 100 and the oil groove 50.

[0079] Combination Figure 3 In some embodiments of the present invention, a winding groove 21 is provided between adjacent stator teeth 20. The winding groove 21 can be configured to fix the winding 200. The plurality of second oil injection holes 32 are divided into a plurality of oil injection hole groups 321 corresponding to the plurality of winding grooves 21 respectively. In other words, each winding groove 21 corresponds to a group of oil injection holes 321 to improve the heat dissipation efficiency of the winding 200. The oil injection hole group 321 includes at least one second oil injection hole 32; or the oil injection hole group 321 includes two second oil injection holes 32 that are symmetrical to each other.

[0080] Combined Figure 3 In some embodiments of the present invention, the oil injection hole group 321 includes two relatively symmetrical second oil injection holes 32. That is, each winding groove 21 is provided with two symmetrical second oil injection holes 32. The two second oil injection holes 32 can simultaneously spray oil to cool the winding 200, thereby improving the heat dissipation efficiency of the winding 200.

[0081] The circumferential dimension of the second oil injection hole 32 is not greater than half the circumferential dimension of the winding groove 21. For example, the second oil injection hole 32 can be rectangular, and the winding groove 21 can also be rectangular. The length dimension of the second oil injection hole 32 is not greater than half the width dimension of the winding groove 21, which facilitates the arrangement of two second oil injection holes 32 in the circumferential direction of the winding groove 21, and the size of the second oil injection hole 32 is controlled within a reasonable range, thereby improving the speed and efficiency of oil injection.

[0082] Combination Figure 3 and Figure 15In some embodiments of the present invention, the second oil injection hole 32 gradually tilts outward along the circumference of the stator core 100, and the cooling oil sprayed from the second oil injection hole 32 can tilt towards the circumference of the stator yoke 10 to form an arc-shaped oil injection curve, which can increase the contact area between the cooling oil and the winding 200 and improve the heat dissipation effect on the winding 200.

[0083] Furthermore, combined Figure 3 The adjacent second oil spray holes 32 are inclined in a direction that approaches or opposes each other in the axial outward direction. Specifically, the adjacent second oil spray holes 32 can be inclined in a direction that approaches each other or in a direction that opposes each other in the axial outward direction (from the middle to the end of the stator core 100). Among them, the two second oil spray holes 32 inclined in the direction of approaching each other can cooperate to spray an arched oil spray curve, which can effectively spray the cooling oil into the gap of the winding 200, increase the contact area with the winding 200, and improve the heat dissipation effect of the winding 200.

[0084] In conjunction with the foregoing, each winding slot 21 corresponds to an oil injection hole group 321. The oil injection hole group 321 includes two relatively symmetrical second oil injection holes 32. That is, each winding slot 21 is provided with two symmetrical second oil injection holes 32. The two second oil injection holes 32 corresponding to each winding slot 21 can be tilted in opposite directions, while the two second oil injection holes 32 corresponding to each stator tooth 20 can be tilted in the direction of approaching each other. The two second oil injection holes 32 corresponding to each stator tooth 20 cooperate to spray out arched cooling oil, which can effectively spray the cooling oil into the gaps of the winding 200, increase the contact area with the winding 200, and improve the heat dissipation effect of the winding 200.

[0085] Among them, combined Figure 15 Each winding groove 21 has a corresponding oil injection hole group 321. As the first lamination 41 is stacked from the middle to the end of the stator core 100, the second oil injection hole 32 gradually expands outward in the circumferential direction and gradually decreases in the radial direction from the center point of the first lamination 41. Furthermore, the second oil injection hole is symmetrical about the straight line formed by the winding groove 21 and the center of the first lamination 41.

[0086] In some embodiments of the present invention, an oil groove 50 is provided on the outer peripheral surface of the stator core 100, and a second oil spray hole 32 is connected to the oil groove 50. In the projection along the axis of the stator core 100, the second oil spray hole 32 is closer to the stator tooth 20 than the oil groove 50. The second oil spray hole 32 is closer to the tooth, in other words, the second oil spray hole 32 is closer to the winding 200. The second oil spray hole 32 is closer to the stator tooth 20 than the first oil spray hole 31. The first oil spray hole 31 can be configured to spray oil on the outside of the stator winding 200, and the second oil spray hole 32 can be configured to spray oil into the gap of the stator winding 200. By cooperating with the first oil spray hole 31 and the second oil spray hole 32, the heat dissipation efficiency of the stator winding 200 can be improved, and multiple cooling methods can be used for the stator winding 200 that is seriously overheating, so as to meet the heat dissipation requirements of high power density and high speed motors.

[0087] The stator according to an embodiment of the present invention includes a winding 200 and the aforementioned stator core 100, wherein the winding 200 is mounted on the stator teeth 20. By providing the aforementioned stator core 100, the heat dissipation effect on the winding 200 can be improved.

[0088] According to an embodiment of the present invention, the motor includes an oil pump and the aforementioned stator. The oil pump is configured to drive cooling oil to spray from a plurality of first oil injection holes 31 and a plurality of second oil injection holes 32 onto the winding 200. By setting the aforementioned stator, the stator has high heat dissipation efficiency and good heat dissipation effect, which can meet the requirements of high speed and high power density of the motor. It is understood that the high heat of the motor will affect the life of the insulation material. By improving the heat dissipation efficiency and heat dissipation effect of the stator, the service life and operational reliability of the motor can be improved.

[0089] The vehicle according to an embodiment of the present invention includes the aforementioned motor.

[0090] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0093] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0095] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A stator core, characterized in that, The stator core has a stator yoke and multiple stator teeth. The multiple stator teeth are connected to the stator yoke and are distributed circumferentially along the stator yoke. The end face of the stator yoke is provided with multiple first oil injection holes and multiple second oil injection holes. The multiple first oil injection holes are distributed circumferentially, and the multiple second oil injection holes are distributed circumferentially. The multiple second oil injection holes surround the multiple first oil injection holes. The oil injection direction of the multiple first oil injection holes and the multiple second oil injection holes is inclined towards the stator teeth.

2. The stator core according to claim 1, characterized in that, The outer circumferential surface of the stator core is provided with an oil groove, and the first oil spray hole is connected to the oil groove; the second oil spray hole is connected to the oil groove.

3. The stator core according to claim 2, characterized in that, The inlet of the first oil injection hole is opposite to the oil groove along the axial direction of the stator core.

4. The stator core according to claim 3, characterized in that, The stator core includes a plurality of first laminations disposed at the ends of the stator core. Each first lamination has a first through hole, which is connected to form a first oil injection hole. The first through hole near the end face of the stator core is closer to the axis of the stator core than the first through hole away from the end face of the stator core.

5. The stator core according to claim 4, characterized in that, The total thickness of the plurality of first laminations is d, the distance of the line connecting the centers of the openings at both ends of the first oil injection hole along the axis of the stator core is h1, the distance from the outer periphery of the first lamination to the outermost layer of the winding is H1, and the distance of the winding protruding from the end face of the stator core is A, wherein H1 / D < h1 / d.

6. The stator core according to claim 2, characterized in that, The projection of the second oil injection hole along the axis of the stator core is closer to the stator teeth than the oil groove.

7. The stator core according to claim 6, characterized in that, The stator core includes a plurality of first laminations disposed at the ends of the stator core. Each first lamination has a second through hole, which is connected to form a second oil injection hole. The second through hole closer to the end face of the stator core is closer to the axis of the stator core than the second through hole further away from the end face of the stator core.

8. The stator core according to claim 7, characterized in that, The total thickness of the plurality of first laminations is d. In the projection along the axis of the stator core, the distance between the second through hole of the first lamination on the end face of the stator core and the second through hole of the first lamination facing away from the end face of the stator core is h2. The distance from the second oil injection hole to the outer surface of the winding is H2. The winding is arched on the end face of the stator core, and the height of the arched protrusion is D, wherein h2 / d < H2 / D.

9. The stator core according to claim 7, characterized in that, The stator core also includes a plurality of second laminations, which are located in the middle of the stator core. Each second lamination has a third through hole that connects to the second through hole and extends through the outer periphery of the second lamination to connect to the oil groove.

10. The stator core according to claim 9, characterized in that, The stator core also includes a plurality of third laminations, which are disposed between the first lamination and the second lamination. The third lamination has a fourth through hole, which connects the second through hole and the third through hole.

11. The stator core according to claim 10, characterized in that, The outer peripheral surface of the third lamination is provided with a first turbulence protrusion, and the outer peripheral surface of the second lamination is provided with a second turbulence protrusion. In the projection along the axis of the stator core, the protrusion height of the second turbulence protrusion is less than the protrusion height of the first turbulence protrusion.

12. The stator core according to claim 2, characterized in that, The oil tank is equipped with turbulence protrusions to create a meandering channel within the oil tank.

13. The stator core according to claim 12, characterized in that, The stator core includes a central lamination located in the middle and end laminations located at the ends. The central lamination includes an annular portion, multiple toothed portions, and multiple protrusions. The periphery of the annular portion is shorter than the periphery of the end laminations. The multiple toothed portions are located on the inner edge of the annular portion, and the protrusions are located on the outer edge of the annular portion. The line connecting the midpoint of the toothed portion along the circumferential direction to the midpoint of the lamination is L1, and the line connecting the midpoint of an adjacent toothed portion along the circumferential direction to the midpoint of the lamination is L2. The protrusions are staggered from the lines L1 and L2.

14. The stator core according to claim 1, characterized in that, A winding groove is provided between adjacent stator teeth, and the plurality of second oil injection holes are divided into a plurality of oil injection hole groups corresponding to the plurality of winding grooves respectively; The injection hole group includes at least one second injection hole; or the injection hole group includes two symmetrical second injection holes.

15. The stator core according to claim 14, characterized in that, The circumferential dimension of the second oil injection hole is not greater than half the circumferential dimension of the winding groove.

16. The stator core according to claim 1, characterized in that, The second oil injection hole gradually tilts outward along the circumference of the stator core.

17. The stator core according to claim 16, characterized in that, The adjacent second injection holes are inclined in a direction that is close to or away from each other in the axial outward direction.

18. A stator, characterized in that, include: The winding and the stator core according to any one of claims 1-17, wherein the winding is mounted on the stator teeth.

19. An electric motor, characterized in that, Includes an oil pump and the stator of claim 18, the oil pump being configured to drive cooling oil from the plurality of first injection holes and the plurality of second injection holes to the winding.

20. A vehicle, characterized in that, Includes the motor as described in claim 19.

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