Stator core and motor

Abstract

The invention provides a stator core and a motor, and relates to the technical field of motors. The stator core comprises a plurality of stacked punching sheet groups, and each punching sheet group comprises a punching sheet body, a first projection and a second projection group. The first protrusion is arranged on the periphery of the punching sheet body, a first through hole is formed in the first protrusion, and the first through hole penetrates through the first protrusion in the axis direction of the punching sheet group; the second bulge group is arranged on the periphery of the punching sheet body and comprises at least two second bulges; the first through hole is at least partially exposed outside the second bulge group along the axial direction of the punching sheet group to form a first communication region, and at least partially exposed between the two second bulges to form a second communication region; at least part of the first communication area is located on one side of the second protrusion set in the circumferential direction, and the other part of the first communication area is located on the other side of the second protrusion set in the circumferential direction. The oil path crosses the protrusions on the periphery of the stator iron core to form the oil path in the circumferential direction of the stator iron core, and miniaturization and integration of the motor are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator core and a motor. Background Art

[0002] With the booming development of the new energy electric drive market, motors are developing in the direction of miniaturization, high power and low cost. One of the important ways to improve motor performance and efficiency is to improve the heat dissipation capacity of the motor. Motor losses mainly include stator losses, rotor losses and mechanical losses. These losses are the main sources of motor heat. High temperature will directly affect the peak and continuous performance output and operational reliability of the motor. Compared with air and water, oil with stronger thermal conductivity has more direct and efficient contact and heat exchange with the main heating area. Therefore, in order to improve the heat dissipation capacity of the motor, oil cooling has gradually become the mainstream technical route for drive motor heat dissipation.

[0003] The traditional end ring oil cooling solution adopts the design of cooling oil channel of the core yoke and oil spray ring installed at the end to realize the cooling of the core and end winding. However, this solution is expensive, and the assembly of the oil spray ring occupies more axial space, and has more stringent requirements on the flatness and verticality of the end of the core, which is not conducive to the miniaturization and integration of the motor. This makes the oil circuit design on the stator core a new trend. However, due to the presence of protrusions on the outer surface of the stator core for welding connection, it is not conducive to the connection of the oil circuit in the circumferential direction. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the present invention provides a stator core to improve the technical problem that the existing stator core cannot achieve oil circuit connectivity in the circumferential direction of the stator core.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a stator core, including a plurality of stacked punching sheet groups, wherein the punching sheet group includes a punching sheet body, a first protrusion and a second protrusion group; the first protrusion is arranged on the outer periphery of the punching sheet body, and a first through hole is arranged on the first protrusion, and the first through hole passes through the first protrusion along the axial direction of the punching sheet group; the second protrusion group is arranged on the outer periphery of the punching sheet body, and the second protrusion group includes at least two second protrusions; the first through hole is at least partially exposed outside the second protrusion group along the axial direction of the punching sheet group to form a first connecting area, and is at least partially exposed between two second protrusions to form a second connecting area; at least part of the first connecting area is located on one side of the second protrusion group in the circumferential direction, and the other part of the first connecting area is located on the other side of the second protrusion group in the circumferential direction.

[0006] In an exemplary embodiment of the present application, a second through hole is provided on the first protrusion, and the thickness of the outer wall of the second through hole is greater than the thickness of the outer wall of the first through hole.

[0007] In an exemplary embodiment of the present application, the first protrusion group and the second protrusion group are stacked in sequence along the axial direction of the punching sheet group.

[0008] In an exemplary embodiment of the present application, the first connecting areas adjacent to each other along the axial direction of the punching sheet group are arranged on both sides of the second protrusion group in the circumferential direction.

[0009] In an exemplary embodiment of the present application, the second protrusion at least partially overlaps with the first through hole on one side along the axial direction of the punching sheet group, and does not overlap with the first through hole on the other side.

[0010] In an exemplary embodiment of the present application, a first welding groove is provided on the outer side surface of the first protrusion, and a second welding groove is provided on the outer side surface of the second protrusion; adjacent punching sheet groups are welded together, and the welds of the welded connections are located in the first welding groove and the second welding groove.

[0011] In an exemplary embodiment of the present application, a projection of the first welding groove along the radial direction of the punch body does not overlap with the first through hole on the same first protrusion.

[0012] In an exemplary embodiment of the present application, the first protrusion includes a first protrusion a where the first welding groove is located in the counterclockwise direction of the first through hole and a first protrusion b where the first welding groove is located in the clockwise direction of the first through hole. The number of the first protrusions a and the first protrusions b is the same, and the arrangement method between the first protrusions a is the same as the arrangement method between the first protrusions b.

[0013] In an exemplary embodiment of the present application, a second protrusion group is disposed between each of the first protrusions a and the first protrusions b.

[0014] In an exemplary embodiment of the present application, the number of the first protrusions on the punching sheet group is the same as that of the second protrusion group, and the arrangement of the first protrusions is the same as that of the second protrusion group.

[0015] In an exemplary embodiment of the present application, the first welding groove overlaps with one of the second welding grooves on the adjacent punching sheet group along the axial direction of the punching sheet group.

[0016] In an exemplary embodiment of the present application, the punching sheet group includes teeth, and a circumferential array of the teeth is arranged on the inner circumference of the punching sheet body, and an angle between the teeth is a first angle α.

[0017] In an exemplary embodiment of the present application, an angle between the first welding groove and the first through hole is a second angle β, and the second angle β is an integer multiple of the first angle α.

[0018] In an exemplary embodiment of the present application, a first welding groove is provided on the outer side surface of the first protrusion, the first welding groove is provided on the outer side wall of the second through hole, and a second welding groove is provided on the outer side surface of the second protrusion; adjacent punching sheet groups are welded and connected, and the welds of the welded connections are located in the first welding groove and the second welding groove.

[0019] In an exemplary embodiment of the present application, a minimum distance between the first welding groove and the second through hole is not less than 2.5 mm.

[0020] In an exemplary embodiment of the present application, the first through hole is an arc-shaped slot hole.

[0021] In an exemplary embodiment of the present application, a through groove connecting two ends of the punch body is formed between the second protrusions, and the through groove is covered with a sealing portion.

[0022] The present application also provides a motor, comprising a rotor and a stator, wherein the stator comprises the stator core described in any one of the above items.

[0023] In combination with the prior art, the beneficial effects of the present invention are:

[0024] The oil circuit of the existing stator core is not convenient to connect in the circumferential direction of the stator core. The punching sheet group of the present application is provided with a first protrusion and a second protrusion group, and a first through hole is provided on the first protrusion. The first through hole is at least partially exposed outside the second protrusion group along the axial direction of the punching sheet group to form a first connecting area, and at least partially exposed between the two second protrusions to form a second connecting area. At least part of the first connecting area is located on one side of the second protrusion group in the circumferential direction, and the other part of the first connecting area is located on the other side of the second protrusion group in the circumferential direction. The cooling medium such as cooling oil enters the first through hole through the first connecting area on one side of the second protrusion group, and then enters the second protrusion group through the second connecting area, and then flows to the other side of the second protrusion group through the first connecting area on the other side, so that the oil circuit crosses the protrusions on the outer periphery of the stator core, forming an oil circuit in the circumferential direction of the stator core, improving the heat dissipation effect, reducing the setting of the oil injection ring, reducing the requirements for the flatness and verticality of the core end, reducing the production cost, and facilitating the miniaturization and integration of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a top view of an exemplary stator core of the present application;

[0027] Figure 2 This is a three-dimensional schematic diagram of an exemplary stator core of the present application;

[0028] Figure 3 This is a three-dimensional schematic diagram of an exemplary stator core of the present application from another angle;

[0029] Figure 4 This is a top view of a stator core with a second through hole as an example of the present application;

[0030] Figure 5 This is a three-dimensional schematic diagram of an exemplary stator core provided with a second through hole in the present application;

[0031] Figure 6 This is a schematic diagram of an exemplary stator core cooling oil circuit of the present application.

[0032] Component number description:

[0033] 100. Film processing body;

[0034] 110, first protrusion; 111, first through hole; 1111, first communication area; 1112, second communication area; 112, second through hole; 1121, third communication area; 1122, fourth communication area; 113, first welding groove; 114, first protrusion a; 115, first protrusion b;

[0035] 120, second protrusion group; 121, second protrusion; 122, second welding groove; 123, groove;

[0036] 130. Tooth; 140. Wire groove; 150. Welding structure. DETAILED DESCRIPTION

[0037] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0038] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are familiar to those skilled in the art and the description of the present invention, and any methods, equipment and materials of the prior art similar or equivalent to the methods, equipment and materials described in the embodiments of the present invention can also be used to implement the present invention.

[0039] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0040] The traditional end ring type oil cooling scheme adopts the design of cooling oil channel of the core yoke and installing oil spray ring at the end to realize the cooling of the core and end winding. However, this scheme is expensive, and the assembly of the oil spray ring takes up more axial space, and has more stringent requirements on the flatness and verticality of the end of the core, which is not conducive to the miniaturization and integration of the motor. This makes it a new trend to design the oil circuit on the stator core, but the existence of protrusions on the outer peripheral surface of the stator core is not conducive to the connection of the oil circuit in the circumferential direction. In view of this, the present application provides a motor and a stator core to solve the problem that the oil circuit is not easy to connect in the circumferential direction of the stator core.

[0041] See also Figures 1 to 6The stator core of the present invention includes a plurality of stacked sheet groups, and the sheet group includes a sheet body 100, a first protrusion 110 and a second protrusion group 120. The first protrusion 110 is arranged on the outer periphery of the sheet body 100, and the first protrusion 110 is provided with a first through hole 111, and the first through hole 111 passes through the first protrusion 110 along the axial direction of the sheet group; the second protrusion group 120 is arranged on the outer periphery of the sheet body 100, and the second protrusion group 120 includes at least two second protrusions 121, and the second protrusion group 120 may include 2, 3, 4 or more second protrusions 121. Preferably, the second protrusion group 120 includes 2 second protrusions 121. The gaps between the protrusions can accommodate the cooling medium such as cooling oil flowing along the circumferential direction of the sheet group. Due to the provision of the protrusions, the oil path cannot form a complete flow in the circumferential direction of the sheet group. The first through hole 111 is at least partially exposed outside the second protrusion group 120 along the axial direction of the punching sheet group to form a first connecting area 1111, and is at least partially exposed between the two second protrusions 121 to form a second connecting area 1112; at least part of the first connecting area 1111 is located on one side of the second protrusion group 120 in the circumferential direction, and the other part of the first connecting area 1111 is located on the other side of the second protrusion group 120 in the circumferential direction. The cooling medium flows from the first connecting area 1111 on one side of the second protrusion group 120 to the first through hole 111, and then flows through the second circulation area to between the two second protrusions 121 of the second protrusion group 120, and then flows through the first connecting area 1111 on the other side of the second protrusion group 120 to the other side of the second protrusion group 120, so that the cooling medium passes through the first protrusion 110 and the second protrusion group 120 to form a circumferential oil path of the stator core, thereby improving the heat dissipation capacity of the stator core, reducing the design of traditional oil injection rings, reducing the design accuracy of the stator core, and reducing production costs. It should be noted that the punching sheet group is formed by stacking a plurality of stator punching sheets, and the structure of the stator punching sheets is the same as that of the punching sheet group. This application takes the punching sheet group as an example and does not elaborate on the stator punching sheets.

[0042] See also Figure 1 In one embodiment, the punch body 100 includes a yoke, a tooth portion 130 and a wire groove 140. The yoke is an annular structure, which serves as a support and connector for other components; the tooth portion 130 is arranged in the inner circle of the yoke and arranged in an array along the circumference of the yoke; a wire groove 140 is formed between adjacent teeth 130, and the wire groove 140 is mainly used to carry and fix wires and windings. The first protrusion 110 and the second protrusion group 120 are both arranged on the outer periphery of the yoke.

[0043] See also Figure 2 and Figure 3In one embodiment, a first welding groove 113 is provided on the outer side surface of the first protrusion 110, and a second welding groove 122 is provided on the outer side surface of the second protrusion 121; the adjacent punching sheet groups are welded and connected, and the welds of the welded connections are located in the first welding groove 113 and the second welding groove 122, and the welds are located in the first welding groove 113 and the second welding groove 122, respectively, which can avoid the welds protruding from the first protrusion 110 and the second protrusion 121, and reduce the influence of the welds on the assembly and positioning of the stator core.

[0044] See also Figure 1 In one embodiment, the projection of the first welding groove 113 along the radial direction of the punching sheet body 100 does not overlap with the first through hole 111 on the same first protrusion 110. The first through hole 111 is a hole that passes through the first protrusion 110, so that the outer wall of the first through hole 111 is thinner, that is, the distance between the first through hole 111 and the outer peripheral surface of the first protrusion 110 is close, which can easily cause deformation of the outer wall of the first through hole 111 during welding, and even the risk of welding through the outer wall of the first through hole 111. The first welding groove 113 is not arranged in the outer wall area of ​​the first through hole 111, that is, the first welding groove 113 is staggered with the weak feature of the punching sheet group, which can effectively avoid the risk of welding through the outer wall of the first through hole 111 during welding, thereby ensuring the strength of the stator core.

[0045] See also Figure 2 and Figure 3 In one embodiment, the first welding groove 113 overlaps with one of the second welding grooves 122 on the adjacent punching sheet group along the axial direction of the punching sheet group, thereby ensuring that adjacent punching sheet groups can be welded together, and the weld is located in the first welding groove 113 and the second welding groove 122.

[0046] See also Figure 2 and Figure 3 In one embodiment, the first protrusion 110 and the second protrusion group 120 are stacked in sequence along the axial direction of the punching sheet group. In other words, the first protrusion 110 on the punching sheet group abuts against the second protrusion group 120 on the adjacent two side punching sheet groups, and the second protrusion group 120 on the punching sheet group abuts against the first protrusion 110 on the adjacent two side punching sheet groups, thereby forming a circumferential oil path passing through the first protrusion 110 and the second protrusion group 120 in the adjacent punching sheet groups, thereby improving the ability of the cooling medium to flow circumferentially along the stator core and improving the heat dissipation capacity.

[0047] See also Figure 6In one embodiment, the first connecting areas 1111 adjacent along the axial direction of the punching sheet group are arranged on both sides of the circumference of the second protrusion group 120. The first connecting area 1111 on one punching sheet group is arranged on one side of the circumference of the second protrusion group 120, and the first connecting areas 1111 adjacent along the axial direction of the punching sheet group are arranged on the other side of the circumference of the second protrusion group 120. Therefore, after the cooling medium flows to between the second protrusions 121 through the first connecting area 1111 on one side of the second protrusion group 120, it can flow out from between the second protrusions 121 through the first connecting area 1111 on the other side of the second protrusion group 120, thereby shortening the flow path of the cooling medium, increasing the flow speed of the cooling medium, and improving the cooling effect.

[0048] See also Figure 6 , the first welding groove 113 is arranged in the area of ​​the outer wall of the non-first through hole 111, and the adjacent first communication areas 1111 are arranged on both sides of the second protrusion group 120 in the circumferential direction, and the adjacent first welding grooves 113 are also staggered. A first welding groove 113 is arranged on the first protrusion 110, and two second welding grooves 122 are arranged on the second protrusion group 120. The two sides of the first welding groove 113 correspond to the second welding grooves 122 respectively, and the second welding groove 122 only corresponds to the first welding groove 113 on one side. During welding, the first welding groove 113 and the second welding grooves 122 on both sides form a group of welding seam structures 150, and the adjacent welding seam structures 150 are staggered. The angle between the two first welding grooves 113, that is, the angle between adjacent weld structures 150, is the angle between the two second protrusions 121 in the second protrusion group 120. During the welding process, each group of weld structures 150 is quickly welded within a certain angle range by galvanometer welding or other welding methods, by swinging or rotating, to approximately achieve the rhythm of welding the entire stator core weld, thereby effectively avoiding the risk of welding through the oil circuit, and realizing the overall connection of the core, ensuring the functional integrity of the core, improving the strength of the core, and ensuring welding efficiency and production efficiency.

[0049] See also Figure 2 and Figure 3 In one embodiment, the second protrusion 121 at least partially overlaps with the first through hole 111 on one side along the axial direction of the punching sheet group, and does not overlap with the first through hole 111 on the other side, so that the first connecting areas 1111 are staggered in the axial direction of the punching sheet group, shortening the flow path of the cooling medium, reducing the flow time of the cooling medium between the two second protrusions 121, reducing the flow resistance of the cooling medium flow, improving the pressure drop of the cooling oil circuit, and realizing rapid circulation in the circumferential direction of the stator core.

[0050] See also Figure 2 and Figure 3In one embodiment, of the two second protrusions 121 of the second protrusion group 120 of two adjacent punching sheet groups, one of the second protrusions 121 at least partially overlaps with the first through hole 111 of the first protrusion 110, and the other second protrusion 121 abuts against the non-first through hole 111 area of ​​the first protrusion 110. When the punching sheet groups are welded and connected, the second protrusion 121 abutting against the non-first through hole 111 area and the first protrusion 110 are welded and connected, and the weld of the welded connection is in the area of ​​the side wall of the first protrusion 110 that is not the first through hole 111, thereby reducing the influence of the welding weld on the first through hole 111 and the like, and preventing the risk of the side wall of the first through hole 111 being welded through.

[0051] In one embodiment, the first protrusion 110 includes a first protrusion a114 where the first welding groove 113 is located in the counterclockwise direction of the first through hole 111 and a first protrusion b115 where the first welding groove 113 is located in the clockwise direction of the first through hole 111. The first protrusions a114 and the first protrusions b115 are the same in number, and the arrangement of the first protrusions a114 is the same as the arrangement of the first protrusions b115. In order to ensure the welding connection between the punching sheet groups, the first welding groove 113 is aligned with a second welding groove 122 in an adjacent second protrusion group 120. By locating the first welding groove 113 at different positions of the first through hole 111, the first welding groove 113 is aligned with the second weld seams on different second protrusions 121 in the second protrusion group 120, so that the first connecting area 1111 on part of the first through hole 111 and the first connecting area 1111 on another part of the first through hole 111 are respectively arranged on both sides of the second protrusion group 120, thereby realizing the conduction of the circumferential oil circuit of the stator core. The number of the first protrusions a114 and the first protrusions b115 are the same, and their arrangement is the same, so that the specifications and structures of the punching sheet groups on both sides of the same punching sheet group are the same. By rotating a certain angle, the two sides of a second protrusion group 120 can be respectively abutted against the first protrusions a114 and the first protrusions b115, so that the adjacent first connecting areas 1111 are arranged on both sides of the second protrusion group 120 in the circumferential direction, thereby reducing the flow resistance of the cooling medium, facilitating the cooling medium to pass through the protrusions, improving the pressure drop of the cooling oil circuit, and facilitating the circumferential flow of the stator core.

[0052] See also Figure 1In one embodiment, the number of the first protrusions 110 and the second protrusion group 120 on the punching sheet group is the same, and the arrangement of the first protrusions 110 is the same as the arrangement of the second protrusion group 120, so as to facilitate the alignment of the first protrusions 110 and the second protrusion group 120 of adjacent punching sheet groups, and facilitate the stacking of punching sheet groups to form an electronic core. Furthermore, combined with the same number of first protrusions a114 and first protrusions b115, and the same arrangement of first protrusions a114 and first protrusions b115, the stator core can be stacked with the same punching sheet groups, and punching sheet groups of the same specifications can be stacked to form a stator core by rotating a certain angle. Reducing the specifications of the punching sheet group facilitates material management, production and assembly, reduces costs, and improves efficiency.

[0053] In one embodiment, a second protrusion group 120 is arranged between each of the first protrusion a114 and the first protrusion b115. In other words, the first protrusion a114 and the first protrusion b115 are arranged in sequence with the second protrusion group 120 between them, thereby reducing the minimum rotation angle of the punching sheet group, improving the rotational symmetry of the punching sheet group, improving the stacking efficiency, and facilitating the stacking of the punching sheet group to form a stator core.

[0054] See also Figure 1 and Figure 4 In one embodiment, the punching sheet group includes a tooth portion 130, and the tooth portion 130 is arranged in a circumferential array on the inner periphery of the yoke portion of the punching sheet body 100, and the angle between the tooth portions 130 is a first angle α. The angle between the first welding groove 113 and the first through hole 111 is a second angle β. Taking the first through hole 111 as an arc-shaped slot hole as an example, the angle between the first welding groove 113 and the first through hole 111 refers to the angle between the center line of the first welding groove 113 and the center line of the first through hole 111, and the second angle β is an integer multiple of the first angle α.

[0055] See also Figure 1 and Figure 4 Furthermore, the angle between the two second welds in the second protrusion group 120 is a third angle φ, which is an integer multiple of the first angle α. The angle between the first protrusion 110 and the second protrusion group 120 is an integer multiple of the first angle α, so as to facilitate alignment of the punching group after rotation.

[0056] See also Figures 4 to 6In another embodiment, a second through hole 112 is provided on the first protrusion 110, one second protrusion 121 in the second protrusion group 120 partially covers the first through hole 111, and another second protrusion 121 partially covers the second through hole 112, and the second through hole 112 is at least partially exposed outside the second protrusion group 120 to form a third connecting area 1121, and the second through hole 112 is at least partially exposed between the two second protrusions 121 to form a fourth connecting area 1122. By providing the third connecting area 1121 and the fourth connecting area 1122, the protrusion channels through which the cooling medium passes are increased, the fluidity of the cooling medium in the circumferential direction of the stator core is improved, and the heat dissipation capacity is improved.

[0057] See also Figure 4 The outer wall thickness of the second through hole 112 is greater than the outer wall thickness of the first through hole 111, and the first welding groove 113 is arranged at the outer wall of the second through hole 112. Since the second through hole 112 has a larger outer wall thickness, the second through hole 112 can be prevented from being welded through, thereby ensuring the integrity of the oil circuit.

[0058] In one embodiment, the minimum distance between the first welding groove 113 and the second through hole 112 is not less than 2.5 mm, so as to prevent the heat affected zone during welding from penetrating the second through hole 112 and reduce the impact of welding on the cooling oil circuit.

[0059] In one embodiment, the first through hole 111 is an arc-shaped slot, and the center of the arc-shaped slot is on the axis of the punching sheet group to ensure that the distance between the first through hole 111 and the outer periphery of the punching sheet group is consistent, which not only ensures the supporting capacity of the first protrusion 110, but also increases the cross-sectional area of ​​the second through hole 112, reduces the flow resistance of the cooling medium, improves the pressure drop of the cooling oil circuit, and improves the flow capacity of the cooling medium.

[0060] In one embodiment, the second through hole 112 is an arc-shaped slot, and the center of the second through hole 112 is on the axis of the punching sheet group, so as to increase the length of the second through hole 112 and improve the passability of the cooling medium.

[0061] In another embodiment, the first through hole 111 may be a circular hole or a long hole, and the hole shape may be a regular hole shape or an irregular hole shape, which is not limited in the present application; similarly, in another embodiment, the second through hole 112 may be a circular hole or a long hole, and the hole shape may be a regular hole shape or an irregular hole shape, which is not limited in the present application.

[0062] See also Figure 5In one embodiment, grooves 123 facing the axis of the sheet group are provided on both sides of the second protrusion group 120. By providing the grooves 123, the distance between the first through hole 111 and the axis of the sheet group can be shortened, thereby increasing the width of the first through hole 111 along the radial direction of the sheet group, and increasing the cross-sectional area of ​​the first connecting area 1111, which is convenient for the flow of cooling medium. Furthermore, the grooves 123 can also shorten the distance between the second through hole 112 and the axis of the sheet group, thereby increasing the width of the second through hole 112 along the radial direction of the sheet group, thereby increasing the cross-sectional area of ​​the third connecting area 1121, which is convenient for the flow of cooling medium.

[0063] In one embodiment, the length of the first through hole 111 is greater than the width of the second protrusion 121 to ensure that the oil paths on both sides of the second protrusion 121 are connected. Similarly, the length of the second through hole 112 is greater than the width of the second protrusion 121 to ensure that both sides of the second protrusion 121 are connected through the second through hole 112.

[0064] In one embodiment, a through groove connecting the two ends of the punch body 100 is formed between the second protrusions 121, and the through groove connects the two ends of the punch body 100 in the axial direction. The through groove can be set along the axial direction of the punch body 100, and can also be set obliquely to the axial direction of the punch body 100. The through groove can be a straight through groove, an arc through groove, a combination of straight lines, an arc combination, or a combination of straight lines and arcs, etc.

[0065] In one embodiment, the through groove is covered with a cover portion, which covers the through groove and is fixedly connected to the second protrusions 121 on both sides of the through groove. Some through grooves may be covered with the cover portion, while other through grooves may not be covered with the cover portion, or all through grooves may be covered with the cover portion.

[0066] In one embodiment, other protrusions are further provided on the periphery of the punching sheet body 100, and the other protrusions can increase the contact area between the stator core matching components and the stator core, thereby improving the support and stability of the stator core matching components such as the motor housing, etc. The other protrusions of adjacent punching sheet groups do not overlap in the axial direction of the punching sheet groups to avoid blocking the circumferential oil path of the stator core.

[0067] The present application also provides a motor, including a rotor and a stator, wherein the stator includes the stator core described in any one of the above items, and a cooling oil circuit is formed in the circumferential direction of the stator core. For other components of the motor, please refer to the existing motor, and this application will not elaborate on them.

[0068] The electronic core of the present invention, through the cooperation of the first through hole 111 and the second protrusion group 120, allows the oil circuit to penetrate the protrusion, thereby realizing the penetration of the circumferential oil circuit of the electronic core; by setting the first welding groove 113 on the side wall of the first protrusion 110 other than the first through hole 111, and cooperating with the welding groove on the second protrusion 121, the welding connection between the punching sheet groups is realized, and the problem of welding through the first through hole 111 is avoided; the weld structure 150 is staggered within a small angle range, and each group of weld structures 150 can be welded quickly at a small angle by means of swinging or rotating by means of welding methods such as galvanometer welding, thereby improving welding efficiency. By setting the second through hole 112, the cross-sectional area of ​​the cooling oil circuit passing through the protrusion is increased, the flow resistance of the cooling medium flow is reduced, the pressure drop of the cooling oil circuit is improved, and the heat dissipation capacity is increased. The punching sheet group is symmetrical, and the assembly is convenient and quick.

[0069] Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance. The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A stator core, characterized in that: A plurality of stacked sheet groups are included, wherein the sheet group includes: Film processing body; A first protrusion is arranged on the outer periphery of the punch body, the first protrusion is provided with a first through hole, and the first through hole penetrates the first protrusion along the axial direction of the punch group; A second protrusion group is arranged on the outer periphery of the punch body, and the second protrusion group includes at least two second protrusions; The first through hole is at least partially exposed outside the second protrusion group along the axial direction of the punching sheet group to form a first connecting area, and is at least partially exposed between two second protrusions to form a second connecting area; at least part of the first connecting area is located on one side of the second protrusion group in the circumferential direction, and the other part of the first connecting area is located on the other side of the second protrusion group in the circumferential direction.

2. The stator core according to claim 1, characterized in that: A second through hole is disposed on the first protrusion, and the thickness of an outer wall of the second through hole is greater than the thickness of an outer wall of the first through hole.

3. The stator core according to claim 1 or 2, characterized in that: The first protrusion group and the second protrusion group are stacked in sequence along the axial direction of the punching sheet group.

4. The stator core according to claim 1 or 2, characterized in that: The first communicating areas adjacent to each other in the axial direction of the punching sheet group are arranged on both sides of the second protrusion group in the circumferential direction.

5. The stator core according to claim 1 or 2, characterized in that: The second protrusion at least partially overlaps with the first through hole on one side along the axial direction of the punching sheet group, and does not overlap with the first through hole on the other side.

6. The stator core according to claim 1 or 2, characterized in that: The outer side surface of the first protrusion is provided with a first welding groove, and the outer side surface of the second protrusion is provided with a second welding groove; the adjacent punching sheet groups are welded and connected, and the welds of the welded connections are located in the first welding groove and the second welding groove.

7. The stator core according to claim 6, characterized in that: A projection of the first welding groove along the radial direction of the punch body does not overlap with the first through hole on the same first protrusion.

8. The stator core according to claim 7, characterized in that: The first protrusion includes a first protrusion a where the first welding groove is located in the counterclockwise direction of the first through hole and a first protrusion b where the first welding groove is located in the clockwise direction of the first through hole. The number of the first protrusions a and the first protrusions b is the same, and the arrangement method between the first protrusions a is the same as the arrangement method between the first protrusions b.

9. The stator core according to claim 8, characterized in that: A second protrusion group is arranged between the first protrusions a and the first protrusions b.

10. The stator core according to claim 7, characterized in that: The number of the first protrusions on the punching sheet group is the same as that of the second protrusion group, and the arrangement of the first protrusions is the same as that of the second protrusion group.

11. The stator core according to claim 6, characterized in that: The first welding groove overlaps with one of the second welding grooves on the adjacent punching sheet group along the axial direction of the punching sheet group.

12. The stator core according to claim 6, characterized in that: The punching sheet group includes teeth, and the teeth are arranged in a circumferential array on the inner circumference of the punching sheet body. The angle between the teeth is a first angle α.

13. The stator core according to claim 12, characterized in that: An angle between the first welding groove and the first through hole is a second angle β, and the second angle β is an integer multiple of the first angle α.

14. The stator core according to claim 2, characterized in that: A first welding groove is provided on the outer side surface of the first protrusion, and the first welding groove is provided on the outer side wall of the second through hole, and a second welding groove is provided on the outer side surface of the second protrusion; the adjacent punching sheet groups are welded and connected, and the welds of the welded connections are located in the first welding groove and the second welding groove.

15. The stator core according to claim 14, characterized in that: The minimum distance between the first welding groove and the second through hole is not less than 2.5 mm.

16. The stator core according to claim 1, characterized in that: The first through hole is an arc-shaped slot hole.

17. The stator core according to claim 1, characterized in that: A through groove connecting the two ends of the punch body is formed between the second protrusions, and the through groove is covered with a sealing portion.

18. A motor, characterized in that: It comprises a rotor and a stator, wherein the stator comprises the stator core according to any one of claims 1 to 17.

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