A stator core, a stator lamination and an electric machine

Abstract

This utility model belongs to the field of motor technology, specifically relating to a stator core, stator laminations, and a motor, comprising: a core body with cooling channels; end stacks including a first stack, a second stack, and a third stack; the first stack having a first channel; the second stack having a second channel, the second channel having a first overlap area with the first channel; the third stack having a third channel, the third channel having a second overlap area with the second channel; the geometric center of the second overlap area is offset relative to the geometric center of the first overlap area along a first vector direction towards the tooth groove; the first vector has a radial component of the core body and a tangential component of the core body. This utility model avoids cooling blind spots caused by winding gaps, improves heat dissipation uniformity, saves axial space and simplifies assembly processes, meeting the compactness requirements of high power density motors.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a stator core, stator laminations, and a motor. Background Technology

[0002] Currently, motor cooling methods mainly employ air cooling, water cooling, and oil cooling. Compared to air and water cooling, oil has stronger thermal conductivity, and its contact and heat exchange with the main heat-generating area are more direct and efficient. Therefore, oil cooling is more suitable for dissipating heat from high-power-density motors. For the stator, one of the main heat sources is the winding. Cooling methods for the winding include: 1. Spraying the winding with oil spray pipes, but this occupies a large space and the cooling uniformity is not ideal; 2. Axially opening oil grooves in the yoke of the stator core and arranging oil rings with holes at the ends. This method still suffers from the problem that the oil rings occupy a large axial space, affecting the motor's power density, and the assembly process is complex; 3. Opening oil channels in the middle of the motor stator core and setting oil grooves that run straight through the windings at the ends of the stator core near the windings. This method affects the electromagnetic circuit because the oil grooves are located close to the windings on the stator core. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a stator core, stator laminations and motor that can improve the heat dissipation efficiency of the windings while ensuring motor performance.

[0004] To achieve the above and other related objectives, this utility model provides a stator core, comprising:

[0005] The iron core body is annular, and the inner or outer annular surface of the iron core body is provided with toothed grooves for accommodating the winding; the interior and / or surface of the iron core body is provided with cooling channels, and at least one end of the cooling channels passes through the end face of the iron core body.

[0006] An end stack is disposed at the end of the iron core body. The end stack includes a first stack, a second stack, and a third stack, wherein the first stack is located between the second stack and the iron core body, or the first stack is formed by a portion of the laminations at the end of the iron core body, and the third stack is located on the side of the second stack away from the iron core body.

[0007] The first stack is provided with a first channel, which is connected to the cooling channel;

[0008] The second stack is provided with a second channel, and the projection of the second channel and the first channel in a first direction has a first overlap area; the first direction is a direction parallel to the axis of the iron core body;

[0009] The third stack is provided with a third channel, and the projection of the third channel and the second channel in the first direction has a second overlap area;

[0010] The geometric center of the second overlapping region is offset relative to the geometric center of the first overlapping region along a first vector toward the tooth groove; the first vector has a radial component of the core body and a tangential component of the core body.

[0011] In an optional embodiment of this utility model, the distances from the geometric center of the second channel and the geometric center of the third channel to the axis of the iron core body are equal; or the distances from the geometric center of the first channel, the geometric center of the second channel, and the geometric center of the third channel to the axis of the iron core body are equal.

[0012] In one optional embodiment of this utility model, the geometric centers of the second channel and the third channel are spaced apart circumferentially along the core body; or the geometric centers of the first channel, the second channel, and the third channel are spaced apart circumferentially along the core body.

[0013] In an optional embodiment of this utility model, the projections of the geometric center of the second channel and the geometric center of the third channel onto the first direction coincide; or the projections of the geometric centers of the first channel, the second channel, and the third channel onto the first direction coincide.

[0014] In an optional embodiment of this utility model, the flow area of ​​the first channel is greater than the flow area of ​​the second channel.

[0015] In an optional embodiment of the present invention, the projection of the first channel in the first direction includes a first connecting region corresponding to the first overlapping region, and a first extended region extending from the first connecting region in a direction away from the second overlapping region.

[0016] In an optional embodiment of this utility model, the flow area of ​​the third channel is greater than the flow area of ​​the second channel.

[0017] In an optional embodiment of the present invention, the projection of the third channel in the first direction includes a second connecting region corresponding to the second overlapping region, and a second extended region extending from the second connecting region in a direction away from the first overlapping region.

[0018] In an optional embodiment of this utility model, the inner or outer ring surface of the end stack is provided with a positioning groove and / or a welding groove arranged along the first direction.

[0019] In an optional embodiment of this utility model, at least the second stack and the third stack are formed by stacking the same stator laminations. The stator laminations are provided with at least a second through hole for forming the second channel and a third through hole for forming the third channel. The stator laminations of the third stack are rotated relative to the stator laminations of the second stack by a second preset angle, so that the third through hole of the stator laminations of the third stack and the second through hole of the stator laminations of the second stack form a second overlap area.

[0020] In an optional embodiment of this utility model, the first stack, the second stack, and the third stack are formed by stacking the same stator laminations, and the stator laminations are further provided with a first through hole for forming the first channel; the stator laminations of the second stack are rotated relative to the stator laminations of the first stack by a first preset angle, so that the second through hole of the stator laminations of the second stack and the first through hole of the stator laminations of the first stack form the first overlapping area.

[0021] To achieve the above and other related objectives, this utility model also provides a stator lamination, comprising:

[0022] Ring-shaped body;

[0023] The annular body is provided with a second through hole and a third through hole spaced apart along the circumference, and the distances from the geometric center of the second through hole and the geometric center of the third through hole to the axis of the annular body are equal.

[0024] The second through hole and the third through hole are configured such that when the two stator laminations are stacked together and rotated relative to each other by a second preset angle, there is a second overlap area between the third through hole of one stator lamination and the second through hole of the other stator lamination, and the second overlap area can cause the liquid flowing from the second through hole to the third through hole to be radially and tangentially deflected.

[0025] In an optional embodiment of the present invention, a first through hole is further provided at intervals from the second through hole and the third through hole along the circumferential direction of the annular body;

[0026] The distance between the geometric center of the first through hole and the axis of the annular body is equal to the distance between the geometric center of the second through hole and the geometric center of the third through hole and the axis of the annular body.

[0027] The first through hole, the second through hole, and the third through hole are configured as follows:

[0028] When the three stator laminations are stacked together, and the middle stator lamination is rotated by a first preset angle relative to one of the stator laminations on one side, and by a second preset angle relative to the stator lamination on the other side, the second through hole of the middle stator lamination has a first overlap area with the first through hole of one of the stator laminations on one side, and has a second overlap area with the third through hole of the stator lamination on the other side. The geometric center of the first overlap area and the geometric center of the second overlap area are spaced apart along a first vector, which has a radial component and a tangential component of the annular body.

[0029] In an optional embodiment of this utility model, the flow area of ​​the first through hole is greater than the flow area of ​​the second through hole.

[0030] In an optional embodiment of the present invention, the first through hole includes a first connecting region corresponding to the first overlapping region, and a first extension region extending from the first connecting region in a direction away from the second overlapping region.

[0031] In an optional embodiment of this utility model, the flow area of ​​the third through hole is greater than the flow area of ​​the second through hole.

[0032] In an optional embodiment of the present invention, the third through hole includes a second connecting region corresponding to the second overlapping region, and a second extension region extending from the second connecting region in a direction away from the second through hole.

[0033] In an optional embodiment of the present invention, the inner or outer edge of the annular body is provided with a second positioning groove and a third positioning groove that are spaced apart circumferentially; the second positioning groove and the third positioning groove are spaced apart circumferentially by a second preset angle.

[0034] In an optional embodiment of the present invention, the inner or outer edge of the annular body is provided with a first positioning groove, a second positioning groove and a third positioning groove that are spaced apart circumferentially; the first positioning groove and the second positioning groove are spaced apart circumferentially by a first preset angle, and the second positioning groove and the third positioning groove are spaced apart circumferentially by a second preset angle.

[0035] To achieve the above and other related objectives, this utility model also provides an electric motor, including the stator core or the stator laminations.

[0036] The technical advantages of this utility model are as follows: An end stack is provided at the end of the stator core. Utilizing the axial projection offset design of the first, second, and third channels, the oil is radially and tangentially offset, resulting in a vortex-like spray onto the end windings. This avoids cooling blind spots caused by winding gaps and improves heat dissipation uniformity. The inclined oil flow design allows the oil spray position to be far from the windings without affecting the cooling effect, reducing damage to the core magnetic circuit. The end stack is integrated with the core body, saving axial space and simplifying the assembly process, meeting the compact requirements of high-power-density motors. Attached Figure Description

[0037] Figure 1 This is a perspective view of the stator core provided in one of the comparative embodiments of this utility model;

[0038] Figure 2 This is a perspective view of the stator core provided in another comparative embodiment of this utility model;

[0039] Figure 3 This is a schematic diagram of the distribution of the side gaps of the stator winding provided in an embodiment of this utility model;

[0040] Figure 4 This is a perspective view of a stator core provided in one embodiment of this utility model;

[0041] Figure 5 This is a perspective view of a stator core provided in another embodiment of the present invention;

[0042] Figure 6 This is a perspective view of the end stack provided in an embodiment of the present invention;

[0043] Figure 7 This is an end view of the end stack provided in an embodiment of the present invention;

[0044] Figure 8 This is a partial enlarged view of the end face of the end stack provided in an embodiment of this utility model;

[0045] Figure 9 yes Figure 8 AA section view;

[0046] Figure 10 yes Figure 8 BB cross-sectional view;

[0047] Figure 11 This is a schematic diagram of the through-hole distribution provided in an embodiment of the present invention, wherein the dotted line represents the first channel, the dashed line represents the second channel, and the solid line represents the third channel. Detailed Implementation

[0048] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0050] This utility model provides a stator core for use in motors, especially motors with high power density requirements, such as drive motors for electric vehicles. The stator core uses special laminations at its ends to allow oil to flow at an angle within the oil channels at the ends, thus cooling the windings. The technical effects of this utility model are explained below with reference to two comparative embodiments:

[0051] Please see Figure 1 As shown, in one comparative embodiment, the core body 10 has a cooling channel 11 inside, and oil rings 20 are provided at both ends of the core body 10. The end windings of the stator are located inside the oil rings 20, and the oil rings 20 can form an end chamber with the motor housing. The cooling channel 11 communicates with the end chamber, and holes 21 are provided on the side wall of the oil rings 20. After the oil enters the end chamber, it is sprayed out from the holes 21, thereby cooling the end windings. In this comparative embodiment, the end chamber occupies more axial space, thereby reducing the power density of the motor. In addition, the oil rings 20 need to be assembled separately with the core body 10, which increases the assembly difficulty.

[0052] Please see Figure 2 As shown, in another comparative embodiment, the end of the core body 10 is provided with an oil groove 111 that passes through the end winding. The oil groove 111 needs to be as close as possible to the end winding, which will cause the internal magnetic circuit of the core body 10 to be damaged by the oil groove 111, affecting the working performance of the motor.

[0053] Please see Figure 4 , 5As shown, this invention features a special lamination at the end of the stator core, causing the oil flow direction in the oil channel at the end of the stator core to simultaneously tilt radially and tangentially towards the end winding. Even if the end oil channel is located far from the winding, the oil can still be smoothly sprayed onto the end winding after being ejected, achieving cooling of the end winding and preventing the oil channel from adversely affecting the internal magnetic circuit of the stator core. At the same time, the special lamination at the end is itself part of the stator core, and it can be welded to other structures of the stator core to form a whole. This not only avoids additional process burdens but also fully utilizes the axial space of the motor.

[0054] In addition, such as Figure 3 As shown, there is generally a gap 301 between the end windings 30, and this gap 301 extends radially through the entire mounting area of ​​the end windings 30 along the stator. When oil is sprayed only radially along the stator, some oil may pass through this gap 301. This portion of oil cannot fully exchange heat with the end windings 30, thus affecting the heat dissipation effect. To address this, the present invention tilts the oil flow direction both radially and tangentially, allowing the oil to be sprayed onto the end windings 30 in a vortex shape, thereby ensuring full contact between the oil and the end windings 30 and further improving the heat dissipation efficiency.

[0055] Please see Figure 4-11 As shown, the technical solution of this utility model will be described in detail below with reference to specific embodiments:

[0056] Please see Figure 4 , 5 As shown, the stator core includes a core body 10 and end stacks 40.

[0057] The core body 10 is annular, and its inner or outer annular surface is provided with slots 101 for accommodating windings. Cooling channels 11 are provided inside and / or on the surface of the core body 10, with at least one end of the cooling channel 11 penetrating the end face of the core body 10. In the illustrated embodiment, the stator core is suitable for an internal rotor motor, therefore its slots 101 are located on the inner annular surface of the core body 10. It should be understood that when the stator core is applied to an external rotor motor, the slots 101 can also be located on the outer annular surface of the core body 10. The specific formation method and path of the cooling channel 11 are not particularly limited; for example, in… Figure 4 , 5In the two embodiments shown, grooves arranged alternately along the axial and circumferential directions can be provided on the outer ring surface of the core body 10. These grooves are interconnected. After the core body 10 is assembled with the motor housing, these grooves and the motor housing together form a circumferential flow channel surrounding the core body 10 or an axial flow channel penetrating along the axial direction of the core body 10. In some other embodiments, the cooling channel 11 can also be formed inside the core body 10, or partly located inside the core body 10 and partly located on the surface of the core body 10.

[0058] Please see Figure 4-11 As shown, an end stack 40 is disposed at the end of the core body 10. The end stack 40 includes a first stack 41, a second stack 42, and a third stack 43. The first stack 41 is located on the side of the second stack 42 closer to the core body 10, or the first stack 41 may be formed by a portion of the laminations at the end of the core body 10. The third stack 43 is located on the side of the second stack 42 away from the core body 10. The first stack 41 has a first channel 411, which communicates with the cooling channel 11. The second stack 42 has a second channel 421. The projections of the second channel 421 and the first channel 411 in a first direction have a first overlap area 401; the first direction is parallel to the axis of the core body 10; the third stack 43 is provided with a third channel 431, and the projections of the third channel 431 and the second channel 421 in the first direction have a second overlap area 402; the geometric center 4020 of the second overlap area 402 is offset relative to the geometric center 4010 of the first overlap area 401 along a first vector a towards the tooth groove 101; the first vector a has a radial component a of the core body 10. r and the component a in the tangential direction of the iron core body 10 t .

[0059] This invention features an end stack 40 at the end of the stator core. By utilizing the axial projection offset design of the first channel 411, the second channel 421, and the third channel 431, the oil is radially and tangentially offset, and then sprayed into the end winding 30 in a vortex shape. This avoids cooling blind spots caused by winding gaps and improves heat dissipation uniformity. The inclined oil flow design allows the oil spray position to be far away from the winding without affecting the cooling effect and reducing damage to the core magnetic circuit. The end stack 40 is integrated with the core body 10, saving axial space and simplifying the assembly process, thus meeting the compact requirements of high power density motors.

[0060] It should be noted that the number of stacks constituting the end stack 40 is not limited to three. For example, in some embodiments, the number of stacks may be four or more; or each stack may be composed of multiple sub-stacks, and the through holes of these sub-stacks may be staggered in sequence. For example, the through holes of each sub-stack may be staggered in sequence along the first vector a, so that the through holes of each stack itself are arranged at an angle.

[0061] Please see Figure 11 As shown, in an optional embodiment of this utility model, the distances from the geometric center 4110 of the first channel 411, the geometric center 4210 of the second channel 421, and the geometric center 4310 of the third channel 431 to the axis of the core body 10 are equal. This further embodiment, by keeping the geometric centers of the first channel 411, the second channel 421, and the third channel 431 at the same radial distance (i.e., located on the same circumference), allows the three stacked stator laminations to be processed using the same reference positioning holes, greatly simplifying the alignment process of the stamping die. This achieves directional oil spraying while also ensuring process stability and cost control for mass production.

[0062] Please see Figure 11 As shown, in a specific embodiment, the geometric centers 4110 of the first channel 411, 4210 of the second channel 421, and 4310 of the third channel 431 are spaced apart circumferentially along the core body 10. This makes it easier to achieve the tangential misalignment of the first overlapping area 401 and the second overlapping area 402. It should be understood that when the required tangential misalignment of the first overlapping area 401 and the second overlapping area 402 is small, it can also be achieved by changing the shape of the first channel 411, the second channel 421, and the third channel 431. In this case, the geometric centers 4110 of the first channel 411, 4210 of the second channel 421, and 4310 of the third channel 431 can also be set to coincide with each other.

[0063] Please see Figure 11As shown, in an optional embodiment of the present invention, the flow area of ​​the first channel 411 and the flow area of ​​the third channel 431 are respectively greater than the flow area of ​​the second channel 421. It should be understood that the flow path of the oil in the end stack 40 is as follows: it enters the first channel 411 from the cooling channel 11 of the iron core body 10, passes through the second channel 421 and the third channel 431 in sequence from the first channel 411, and is ejected from the third channel 431. In this further embodiment, by designing the flow area of ​​the first channel 411 to be larger than that of the second channel 421, the local resistance when the oil enters the end stack 40 can be reduced, and the excessive pressure drop at the inlet due to the throttling effect can be avoided. The reduced diameter of the second channel 421 can accelerate the passage of the oil and enhance the jet kinetic energy. The flow area of ​​the third channel 431 is designed to be larger than that of the second channel 421, which can make the oil form a more uniform diffusion when it leaves the end stack 40, while reducing the obstruction of the flow by the outlet back pressure, thereby improving the overall delivery efficiency and spray coverage effect of the cooling oil.

[0064] Please see Figure 11 As shown, it should be understood that since the distances from the geometric center 4110 of the first channel 411, the geometric center 4210 of the second channel 421, and the geometric center 4310 of the third channel 431 to the axis of the core body 10 are equal, in order to make the first overlapping area 401 and the second overlapping area 402 radially misaligned, it is necessary to at least set the first channel 411 and the third channel 431 into irregular structures. For example, in an optional embodiment of this utility model, the projection of the first channel 411 in the first direction includes a first connecting area corresponding to the first overlapping area 401, and a first extension area extending from the first connecting area in a direction away from the second overlapping area 402; the projection of the third channel 431 in the first direction includes a second connecting area corresponding to the second overlapping area 402, and a second extension area extending from the second connecting area in a direction away from the first overlapping area 401. This further embodiment cleverly utilizes an irregular structure to achieve radial directional offset of the oil passages by setting a first extension zone and a second extension zone on the first passage 411 and the third passage 431, respectively, while maintaining the equal distance from the geometric center of each through hole to the axis of the core body 10. This design maintains the consistency of the reference positioning during lamination processing, and forms the tilt angle required for oil injection through the asymmetrical extension of the extension zone. At the same time, it ensures a smooth transition of the oil passages, avoiding flow separation or eddy current loss due to abrupt changes in cross-section, and ultimately achieving a balance between process feasibility and cooling performance optimization.

[0065] Please see Figure 7 , 8As shown, in an optional embodiment of this utility model, the first stack 41, the second stack 42, and the third stack 43 are formed by stacking identical stator laminations 400. Each stator lamination 400 includes an annular body, on which a first through hole, a second through hole, and a third through hole are provided at circumferential intervals. The distances from the geometric centers of the first, second, and third through holes to the axis of the annular body are equal. When two stator laminations 400 are stacked together and rotated relative to each other by a first preset angle, a first overlap area 401 is formed between the first through hole of one stator lamination 400 and the second through hole of the other stator lamination 400. When rotating by a second preset angle, a second overlap area 402 is formed between the second through hole of one of the stator laminations 400 and the third through hole of the other stator lamination 400; the stator laminations 400 of the second stack 42 have a first phase difference in the circumferential direction relative to the stator laminations 400 of the first stack 41, that is, the stator laminations 400 of the second stack 42 rotate by the first preset angle relative to the stator laminations 400 of the first stack 41; the stator laminations 400 of the third stack 43 have a second phase difference in the circumferential direction relative to the stator laminations 400 of the second stack 42, that is, the stator laminations 400 of the third stack 43 rotate by the second preset angle relative to the stator laminations 400 of the second stack 42. This further embodiment achieves standardized production by using the same lamination rotation and stacking process, requiring only one lamination die to process all stacks, significantly reducing manufacturing costs and inventory complexity.

[0066] In other embodiments, the first stack 41, the second stack 42, and the third stack 43 may also be formed by stacking different stator laminations. For example, the stator laminations of the first stack 41 may only have a first through hole, the stator laminations of the second stack 42 may only have a second through hole, and the stator laminations of the third stack 43 may only have a third through hole. Alternatively, the second stack 42 and the third stack 43 may use the same stator laminations, and the first stack 41 may use the same stator laminations as the end of the core body. In this case, the stator laminations of the second stack 42 and the third stack 43 may simultaneously have both a second through hole and a third through hole, without the need for a first through hole.

[0067] Please see Figure 6 , 7As shown, in an optional embodiment of this utility model, the inner or outer annular surface of the end stack 40 is provided with positioning grooves 44 and welding grooves 45 arranged along the first direction. Specifically, the inner or outer edge of the annular body is provided with a first positioning groove 441, a second positioning groove 442, and a third positioning groove 443 spaced apart circumferentially; the first positioning groove 441 and the second positioning groove 442 are spaced apart circumferentially by a first preset angle, and the second positioning groove 442 and the third positioning groove 443 are spaced apart circumferentially by a second preset angle. Since the second stack 42 rotates relative to the first stack 41 by a first preset angle, and the third stack 43 rotates relative to the second stack 42 by a second preset angle, the first positioning groove 441 of the first stack 41, the second positioning groove 442 of the second stack 42, and the third positioning groove 443 of the third stack 43 can be aligned with each other. This further embodiment achieves assembly guidance between different stacks through positioning grooves 44 with preset angle distribution. By utilizing the circumferential angle difference of the first positioning groove 441, the second positioning groove 442, and the third positioning groove 443, the relative positions of each stack are automatically aligned during stacking, ensuring the accurate reproduction of the oil tilt flow angle.

[0068] In the illustrated embodiment, since it is the stator core of an internal rotor motor, the positioning groove 44 and the welding groove 45 are located on the outer ring surface of the end stack 40. It should be understood that when the present invention is applied to the stator core of an external rotor motor, the positioning groove 44 and the welding groove 45 can be set on the inner ring surface of the end stack 40.

[0069] In some embodiments, the end stack 40 may be provided with a tooth 101 corresponding to the tooth 101 on the core body 10; in other embodiments, the end stack 40 may not be provided with a tooth 101, for example, the inner diameter or outer diameter of the end winding 30 may be set to completely avoid the tooth 101 on the core body 10.

[0070] In summary, this invention features an end stack 40 at the stator core end. Utilizing the axial projection offset design of the first channel 411, second channel 421, and third channel 431, the oil is radially and tangentially offset, resulting in a vortex-like spray onto the end winding 30. This avoids cooling blind spots caused by winding gaps and improves heat dissipation uniformity. The inclined oil flow design allows the oil spray position to be far from the winding without affecting the cooling effect, reducing damage to the core magnetic circuit. The end stack 40 is integrated with the core body 10, saving axial space and simplifying the assembly process, meeting the compact requirements of high-power-density motors. The first channel 411… The geometric centers of the second channel 421 and the third channel 431 maintain the same radial distance, allowing the three stacked stator laminations 400 to be machined using the same reference positioning hole, greatly simplifying the alignment process of the stamping die. This achieves directional oil spraying while also ensuring process stability and cost control for mass production. By designing the flow area of ​​the first channel 411 to be larger than that of the second channel 421, the local resistance when the oil enters the end stack 40 can be reduced, avoiding excessive inlet pressure drop due to throttling effects. The reduced diameter of the second channel 421 accelerates oil flow and enhances spray kinetic energy. The flow area of ​​the third channel 431... The area is designed to be larger than the second channel 421, which allows the oil to spread more evenly when leaving the end stack 40, while reducing the obstruction of flow by the outlet back pressure, thereby improving the overall delivery efficiency and spray coverage of the cooling oil. By setting the first extension area and the second extension area on the first channel 411 and the third channel 431 respectively, while keeping the distance from the geometric center of each through hole to the axis of the iron core body 10 equal, the irregular structure is cleverly used to achieve the radial directional offset of the oil passage. This design maintains the consistency of the reference positioning during the stamping process, and forms the tilt angle required for oil spraying through the asymmetrical extension of the extension area. The process ensures a smooth transition of the oil passages, avoiding flow separation or eddy current losses due to abrupt changes in cross-section, ultimately achieving a balance between process feasibility and cooling performance optimization. By adopting the same lamination rotation and stacking process, standardized production is achieved, requiring only one lamination die to process all stacks, significantly reducing manufacturing costs and inventory complexity. The positioning grooves 44 with preset angle distribution realize assembly guidance between different stacks. Utilizing the circumferential angle difference of the first positioning groove 441, the second positioning groove 442, and the third positioning groove 443, the relative positions of each stack are automatically aligned during stacking, ensuring accurate reproduction of the oil tilt flow angle.

[0071] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0072] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A stator core, characterized in that, include: The iron core body is annular, and the inner or outer annular surface of the iron core body is provided with toothed grooves for accommodating the winding; the interior and / or surface of the iron core body is provided with cooling channels, and at least one end of the cooling channels passes through the end face of the iron core body. An end stack is disposed at the end of the iron core body. The end stack includes a first stack, a second stack, and a third stack, wherein the first stack is located between the second stack and the iron core body, or the first stack is formed by a portion of the laminations at the end of the iron core body, and the third stack is located on the side of the second stack away from the iron core body. The first stack is provided with a first channel, which is connected to the cooling channel; The second stack is provided with a second channel, and the projection of the second channel and the first channel in a first direction has a first overlap area; the first direction is a direction parallel to the axis of the iron core body; The third stack is provided with a third channel, and the projection of the third channel and the second channel in the first direction has a second overlap area; The geometric center of the second overlapping region is offset relative to the geometric center of the first overlapping region along a first vector toward the tooth groove; the first vector has a radial component of the core body and a tangential component of the core body.

2. The stator core according to claim 1, characterized in that, The distances from the geometric center of the second channel and the geometric center of the third channel to the axis of the iron core body are equal; or the distances from the geometric center of the first channel, the geometric center of the second channel, and the geometric center of the third channel to the axis of the iron core body are equal.

3. The stator core according to claim 1, characterized in that, The geometric centers of the second and third channels are spaced apart circumferentially along the core body; or the geometric centers of the first, second, and third channels are spaced apart circumferentially along the core body.

4. The stator core according to claim 1, characterized in that, The projections of the geometric center of the second channel and the geometric center of the third channel onto the first direction coincide; or the projections of the geometric centers of the first channel, the second channel, and the third channel onto the first direction coincide.

5. The stator core according to claim 1, characterized in that, The flow area of ​​the first channel is greater than that of the second channel.

6. The stator core according to claim 5, characterized in that, The projection of the first channel in the first direction includes a first connected region corresponding to the first overlapping region, and a first extended region extending from the first connected region in a direction away from the second overlapping region.

7. The stator core according to claim 1, characterized in that, The flow area of ​​the third channel is greater than that of the second channel.

8. The stator core according to claim 7, characterized in that, The projection of the third channel in the first direction includes a second connected region corresponding to the second overlapping region, and a second extended region extending from the second connected region in a direction away from the first overlapping region.

9. The stator core according to claim 1, characterized in that, The inner or outer ring surface of the end stack is provided with positioning grooves and / or welding grooves arranged along the first direction.

10. The stator core according to claim 1, characterized in that, At least the second stack and the third stack are formed by stacking the same stator laminations, and the stator laminations are provided with at least a second through hole for forming the second channel and a third through hole for forming the third channel; the stator laminations of the third stack are rotated relative to the stator laminations of the second stack by a second preset angle, so that the third through hole of the stator laminations of the third stack and the second through hole of the stator laminations of the second stack form a second overlap area.

11. The stator core according to claim 10, characterized in that, The first stack, the second stack, and the third stack are formed by stacking identical stator laminations, and the stator laminations are further provided with a first through hole for forming the first channel; the stator laminations of the second stack are rotated relative to the stator laminations of the first stack by a first preset angle, so that the second through hole of the stator laminations of the second stack and the first through hole of the stator laminations of the first stack form the first overlap area.

12. A stator lamination, characterized in that, include: Ring-shaped body; The annular body is provided with a second through hole and a third through hole spaced apart along the circumference, and the distances from the geometric center of the second through hole and the geometric center of the third through hole to the axis of the annular body are equal. The second through hole and the third through hole are configured such that when the two stator laminations are stacked together and rotated relative to each other by a second preset angle, there is a second overlap area between the third through hole of one stator lamination and the second through hole of the other stator lamination, and the second overlap area can cause the liquid flowing from the second through hole to the third through hole to be radially and tangentially deflected.

13. The stator lamination according to claim 12, characterized in that, It also includes a first through hole that is spaced apart from the second through hole and the third through hole along the circumference of the annular body; The distance between the geometric center of the first through hole and the axis of the annular body is equal to the distance between the geometric center of the second through hole and the geometric center of the third through hole and the axis of the annular body. The first through hole, the second through hole, and the third through hole are configured as follows: When the three stator laminations are stacked together, and the middle stator lamination is rotated by a first preset angle relative to one of the stator laminations on one side, and by a second preset angle relative to the stator lamination on the other side, the second through hole of the middle stator lamination has a first overlap area with the first through hole of one of the stator laminations on one side, and has a second overlap area with the third through hole of the stator lamination on the other side. The geometric center of the first overlap area and the geometric center of the second overlap area are spaced apart along a first vector, which has a radial component and a tangential component of the annular body.

14. The stator lamination according to claim 13, characterized in that, The flow area of ​​the first through hole is greater than that of the second through hole.

15. The stator lamination according to claim 14, characterized in that, The first through-hole includes a first connecting region corresponding to the first overlapping region, and a first extension region extending from the first connecting region in a direction away from the second overlapping region.

16. The stator lamination according to claim 12, characterized in that, The flow area of ​​the third through hole is greater than that of the second through hole.

17. The stator lamination according to claim 16, characterized in that, The third through hole includes a second connecting region corresponding to the second overlapping region, and a second extension region extending from the second connecting region in a direction away from the second through hole.

18. The stator lamination according to claim 12, characterized in that, The inner or outer edge of the annular body is provided with a second positioning groove and a third positioning groove that are spaced apart circumferentially; the second positioning groove and the third positioning groove are spaced apart circumferentially by a second preset angle.

19. The stator lamination according to claim 13, characterized in that, The inner or outer edge of the annular body is provided with a first positioning groove, a second positioning groove and a third positioning groove that are spaced apart circumferentially; the first positioning groove and the second positioning groove are spaced apart circumferentially by a first preset angle, and the second positioning groove and the third positioning groove are spaced apart circumferentially by a second preset angle.

20. An electric motor, characterized in that, It includes the stator core as described in any one of claims 1-11, or the stator lamination as described in any one of claims 12-19.

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