Stator core, insulation sleeve, motor stator, motor, power assembly and vehicle

Abstract

A stator iron core, an insulation sleeve, a motor stator, a motor, a power assembly and a vehicle are provided, the stator iron core is provided with an installation groove extending along an axial direction, the installation groove is suitable for accommodating a winding, the groove wall of the installation groove is convexly provided with a plurality of limiting projections, the plurality of limiting projections are suitable for abutting against the winding, and the insulation sleeve is arranged on the insulation sleeve. The at least two limiting protrusions are symmetrically arranged on the groove walls of the two sides of the mounting groove. In the application, the groove wall of the mounting groove is convexly provided with the plurality of limiting bulges at intervals, the winding is connected with the plurality of limiting bulges, and the at least two limiting bulges are symmetrically arranged on the groove walls at the two sides of the mounting groove, so that the two sides of the winding are uniformly stressed, and the winding is prevented from deviating or inclining relative to the stator core due to overlarge stress at one side; and the positioning effect on the winding is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a stator core, an insulating sleeve, a motor stator, a motor, a power assembly and a vehicle. Background Art

[0002] In hybrid vehicles or pure electric vehicles, the motor is the power source of the vehicle, and the performance and safety of the motor are crucial. The motor includes a motor stator and a motor rotor. The motor stator is the stationary part of the motor. The motor stator includes a stator core and a stator winding. The stator core is used to form a magnetic flux path and embed the stator winding. The stator winding is insulated from the stator core by insulating paper. The stator winding can be supplied with current to generate a magnetic field; due to the magnetic field, the motor rotor rotates inside the motor stator to drive the vehicle.

[0003] In the prior art, the stator winding is easily displaced relative to the stator core. Utility Model Content

[0004] The purpose of the present application is to provide a stator core, an insulating sleeve, a motor stator, a motor, a power assembly and a vehicle, which solve the problem that the winding is easily displaced relative to the stator core.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a stator core, which is provided with an axially extending mounting groove, which is suitable for accommodating a winding, and a plurality of limiting protrusions are protruding from the groove wall of the mounting groove, and the plurality of limiting protrusions are suitable for abutting against the winding, and at least two of the limiting protrusions are symmetrically arranged on the groove walls on both sides of the mounting groove.

[0007] In one embodiment, the winding includes an insulating sleeve and a coil, the insulating sleeve is sleeved on the coil and is tightly connected to the coil, and the plurality of limiting protrusions are suitable for abutting against the outer wall of the insulating sleeve.

[0008] In one embodiment, the stator core includes a stator yoke and a plurality of stator teeth, wherein the plurality of stator teeth are convexly arranged on the inner wall of the stator yoke at intervals along the circumferential direction of the stator core, each stator tooth extends along the axial direction of the stator core, and the region between two adjacent stator teeth forms the mounting groove;

[0009] The plurality of limiting protrusions are symmetrically arranged on two side walls of two adjacent stator teeth portions that are close to each other.

[0010] In one embodiment, the mounting groove is spaced apart from the radial outer side wall of the stator core, the mounting groove is spaced apart from the radial inner side wall of the stator core, and at least two limiting protrusions are symmetrically arranged on two groove walls of the mounting groove that are radially opposite to each other along the stator core.

[0011] In one embodiment, a plurality of the limiting protrusions are respectively provided on the groove walls on both sides of the installation groove, and a cooling channel is formed in an area between two adjacent limiting protrusions on the same groove wall of the installation groove.

[0012] In one embodiment, a plurality of the cooling channels are provided on the same slot wall of the installation slot, and a dimension of any one of the cooling channels in the radial direction of the stator core is larger than a dimension of any one of the limiting protrusions in the radial direction of the stator core.

[0013] In one implementation, the cross-sectional areas of any one of the cooling channels in a direction perpendicular to the axial direction of the stator core are consistent.

[0014] In one embodiment, a plurality of the limiting protrusions are respectively provided on the groove walls on both sides of the installation groove, and the protruding heights of the plurality of limiting protrusions located on the same groove wall of the installation groove gradually increase from inside to outside in the radial direction of the stator core.

[0015] In the second aspect, the present application also provides an insulating sleeve, which is provided with an installation groove extending along the axial direction, and the installation groove is suitable for accommodating a coil. A plurality of limiting protrusions are provided on the groove wall of the installation groove at intervals, and the plurality of limiting protrusions are suitable for abutting against the coil, and at least two of the limiting protrusions are symmetrically arranged on the groove walls on both sides of the installation groove.

[0016] In one embodiment, the insulating sleeve includes a first insulating portion, a second insulating portion, a third insulating portion, and a fourth insulating portion connected end to end in sequence, the first insulating portion is adapted to be tightly connected to the inner wall of the stator yoke portion of the stator core, the second insulating portion and the third insulating portion are adapted to be tightly connected to two side walls of two adjacent stator teeth of the stator core, respectively, and the fourth insulating portion is adapted to be connected between two side walls of two adjacent stator teeth of the stator core that are close to each other;

[0017] A plurality of the limiting protrusions are symmetrically provided on the second insulating portion and the third insulating portion, and / or a plurality of the limiting protrusions are symmetrically provided on the first insulating portion and the fourth insulating portion.

[0018] In one embodiment, part of the first insulating part, the second insulating part and part of the fourth insulating part are connected to form a first skeleton, another part of the first insulating part, the third insulating part and another part of the fourth insulating part are connected to form a second skeleton, and the first skeleton and the second skeleton are arranged separately.

[0019] In one embodiment, part of the second insulating part, the first insulating part and part of the third insulating part are connected to form a first skeleton, another part of the second insulating part, the fourth insulating part and another part of the third insulating part are connected to form a second skeleton, and the first skeleton and the second skeleton are arranged separately.

[0020] In a third aspect, the present application further provides a motor stator, comprising a winding and a stator core as described in the first aspect, wherein the winding is inserted into the mounting groove, and the winding is connected to a plurality of the limiting protrusions;

[0021] or,

[0022] It comprises a stator core, a coil and the insulating sleeve as described in the second aspect, wherein the insulating sleeve is inserted in the stator core, the coil is inserted in the mounting groove, and the coil is connected to a plurality of the limiting protrusions.

[0023] In a fourth aspect, the present application further provides a motor, comprising the motor stator as described in the third aspect.

[0024] In a fifth aspect, the present application also provides a powertrain, comprising the motor as described in the fourth aspect.

[0025] In a sixth aspect, the present application also provides a vehicle, comprising the motor as described in the fourth aspect or the powertrain as described in the fifth aspect.

[0026] In the present application, a mounting groove is provided on the stator core, and a plurality of limiting protrusions are provided at intervals on the groove wall of the mounting groove. The winding is inserted into the mounting groove, and the winding is connected to the plurality of limiting protrusions. At least two limiting protrusions are symmetrically provided on the groove walls on both sides of the mounting groove, so that the force on both sides of the winding is uniform, and the winding is prevented from being offset or tilted relative to the stator core due to excessive force on one side, thereby improving the positioning effect of the winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A three-dimensional diagram of a motor stator according to Embodiment 1 of the present application;

[0029] Figure 2 A top view of the motor stator according to the first embodiment of the present application;

[0030] Figure 3 A partial structural top view of a stator core according to a first implementation mode of Example 1 of the present application;

[0031] Figure 4 A partial structural top view of a stator core according to a second implementation mode of Example 1 of the present application;

[0032] Figure 5 A partial structural top view of a stator core according to a third implementation mode of Example 1 of the present application;

[0033] Figure 6 A partial structural top view of a stator core according to a fourth implementation mode of Example 1 of the present application;

[0034] Figure 7 A partial structural top view of a stator core according to a first implementation mode of the second embodiment of the present application;

[0035] Figure 8 A partial structural top view of the stator core of the second embodiment of the present application;

[0036] Fig. 9 A top view of an insulating sleeve according to a first embodiment of the second embodiment of the present application;

[0037] Fig.10 A partial structural top view of a motor stator according to a second implementation mode of the second embodiment of the present application;

[0038] Fig.11 This is a top view of the insulating sleeve of the second implementation method of Example 2 of the present application.

[0039] Description of reference numerals:

[0040] 100, stator core; 110, mounting groove; 120, limiting protrusion; 130, stator yoke; 140, stator tooth; 141, notch; 150, cooling channel; 200, winding; 210, insulating sleeve; 211, first insulating part; 212, second insulating part; 213, third insulating part; 214, fourth insulating part; 215, first skeleton; 216, second skeleton; 220, coil. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0044] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0045] The present application provides a vehicle, which includes a powertrain and a frame. The powertrain is installed on the frame, and the powertrain provides power to the vehicle to drive the vehicle.

[0046] The powertrain includes the engine, motor, gearbox, drive shaft, differential and clutch. The engine generates power by burning fuel, while the motor converts electrical energy into mechanical energy. Both power sources can provide the required driving force for the vehicle. The clutch engages or disengages between the engine or motor and the gearbox to ensure that the power of the engine or motor can be smoothly transmitted to the gearbox, while allowing the driver to disconnect the engine or motor from the gearbox when necessary for gear shifting. Through the gearbox, the power of the engine or motor can be properly adjusted so that the vehicle can maintain the best power output at different speeds and loads. The drive shaft transfers torque from the gearbox to the wheels, thereby moving the vehicle. The differential enables the two drive wheels of the vehicle to rotate at different speeds when turning or under different road conditions, which helps maintain the stability and handling of the vehicle.

[0047] In hybrid vehicles or pure electric vehicles, the motor is the main power source of the vehicle, and the performance and safety of the motor are crucial. The motor includes a motor stator and a motor rotor. The motor stator is the stationary part of the motor. The motor stator includes a stator core and a stator winding. The stator core is used to form a magnetic flux path and embed the stator winding. The stator winding is insulated from the stator core by insulating paper. The stator winding can be supplied with current to generate a magnetic field; due to the magnetic field, the motor rotor rotates inside the motor stator to drive the vehicle. In addition, the motor can also be used in suspension systems, electric seats and other components.

[0048] In the prior art, the stator winding is easily displaced relative to the stator core.

[0049] Embodiment 1

[0050] refer to Figure 1 , Figure 2 and Figure 3 The present application provides a motor stator, which includes a stator core 100 and a winding 200. The stator core 100 is provided with an axially extending mounting groove 110, and a plurality of spaced-apart limiting protrusions 120 are provided on the groove wall of the mounting groove 110. The plurality of limiting protrusions 120 abut against the winding 200 to fix the winding 200; and at least two limiting protrusions 120 are symmetrically arranged on the groove walls on both sides of the mounting groove 110, that is, at least two limiting protrusions 120 are symmetrically arranged on both sides of the winding 200 to position the two sides of the winding 200. When the winding 200 is subjected to external force, the forces on both sides of the winding 200 are uniform and symmetrical, thereby preventing the winding 200 from becoming unstable due to excessive force on one side; and the two symmetrically arranged limiting protrusions 120 can prevent the winding 200 from shifting or tilting toward the limiting protrusion 120 on one side, thereby keeping the winding 200 in a predetermined position and improving the positioning effect of the winding 200.

[0051] In this embodiment, the stator core 100 is hollow to accommodate the motor rotor. The mounting groove 110 is formed by the inner wall depression of the stator core 100, that is, the mounting groove 110 is an open groove with a notch along the radial direction of the stator core 100. The winding 200 includes an insulating sleeve 210 and a coil 220. The insulating sleeve 210 is sleeved on the coil 220 and is tightly connected with the coil 220. The insulating sleeve 210 is inserted into the mounting groove 110, and the coil 220 is separated from the stator core 100 by the insulating sleeve 210 to achieve insulation between the coil 220 and the stator core 100 to prevent electrical short circuit.

[0052] The insulating sleeve 210 is tightly connected to the plurality of limiting protrusions 120 to suppress displacement of the insulating sleeve 210 relative to the stator core 100, thereby improving the installation firmness of the insulating sleeve 210, and further improving the installation firmness of the coil 220, so that the overall positioning effect of the winding 200 is good.

[0053] The material of the insulating sleeve 210 can be insulating materials such as rubber, silicone or plastic, and can be specifically silicone rubber (SIL), fluororubber (FKM), PVC (polyvinyl chloride) and PE (polyethylene).

[0054] refer to Figure 3 The stator core 100 includes a stator yoke 130 and a plurality of stator teeth 140. The stator yoke 130 is a ring-shaped or approximately ring-shaped structure with thickness. The plurality of stator teeth 140 are convexly arranged on the inner wall of the stator yoke 130 at intervals along the circumference of the stator core 100. Each stator tooth 140 extends along the axial direction of the stator core 100. The region between two adjacent stator teeth 140 forms a mounting groove 110. The plurality of limiting protrusions 120 are symmetrically convexly arranged on two side walls of two adjacent stator teeth 140 that are close to each other, that is, the plurality of limiting protrusions 120 are radially symmetrical. The insulating sleeve 210 is connected to the limiting protrusions 120 arranged on two adjacent stator teeth 140, so as to position the two sides of the insulating sleeve 210, improve the firmness of the installation of the insulating sleeve 210, and thereby inhibit the displacement of the coil 220 in the insulating sleeve 210 relative to the stator core 100.

[0055] In the motor stator provided in this embodiment, a plurality of limiting protrusions 120 are respectively provided on the groove walls on both sides of the installation groove 110, and the area between two adjacent limiting protrusions 120 on the same groove wall of the installation groove 110 forms a cooling channel 150. Specifically, the insulating sleeve 210 is connected to the plurality of limiting protrusions 120, and the cooling channel 150 is located between the groove wall of the installation groove 110 and the outer wall of the insulating sleeve 210, and the coolant in the cooling channel 150 can cool the winding in the insulating sleeve 210.

[0056] A plurality of limiting protrusions 120 are respectively arranged on the groove walls on both sides of the installation groove 110, and the protruding heights of the plurality of limiting protrusions 120 located on the same groove wall of the installation groove 110 gradually increase from the inside to the outside in the radial direction of the stator core 100, so that the width of the cooling channel 150 in the circumferential direction of the stator core 100 gradually increases from the inside to the outside in the radial direction of the stator core 100, thereby increasing the cross-sectional area of ​​the cooling channel 150 and achieving a better cooling effect. At the same time, the effective width a of a single stator tooth 140 is kept consistent in the radial direction of the stator core 100, so that the magnetic flux distribution is uniform.

[0057] A plurality of cooling channels 150 are provided on the same slot wall of the installation slot 110 to improve the cooling effect on the coil 220 in the insulation sleeve 210. The radial dimension of any cooling channel 150 in the stator core 100 is larger than the radial dimension of the limiting protrusion 120 in the stator core 100, so as to improve the cooling effect as much as possible while improving the positioning effect of the insulation sleeve 210 and the coil 220.

[0058] The cross-sectional area of ​​any cooling channel 150 perpendicular to the axial direction of the stator core 100 is consistent, and the cross-sectional area of ​​the cooling channel 150 remains unchanged, so that the cooling of the stator core 100 and the coil 220 is more uniform and the cooling effect is more stable.

[0059] refer to Figure 4 , Figure 5 and Figure 6 In one embodiment, the mounting groove 110 is spaced apart from the radial outer wall of the stator core 100, and the mounting groove 110 is spaced apart from the radial inner wall of the stator core 100, that is, the mounting groove 110 is disposed between the radial outer wall and the radial inner wall of the stator core 100. Specifically, Figure 4 The stator core 100 shown in the figure includes a stator yoke 130, a stator tooth 140 and a notch 141. The notch 141 is connected to two side walls of two adjacent stator teeth 140 that are close to each other. The notch 141, the stator yoke 130 and the two adjacent stator teeth 140 form a mounting slot 110. Figure 4 The mounting slot 110 shown is a closed slot. Figure 4 In the embodiment, the limiting protrusions 120 and the cooling channels 150 are symmetrically arranged on two adjacent stator teeth 140 , and the limiting protrusions 120 and the cooling channels 150 are symmetrically arranged on the stator yoke 130 and the notch 141 . Figure 5 In the embodiment, the limiting protrusions 120 and the cooling channels 150 are symmetrically arranged only on two adjacent stator teeth 140 . Figure 6 In the embodiment, the limiting protrusion 120 and the cooling channel 150 are symmetrically arranged only on the stator yoke 130 and the notch 141. Both sides of the winding 200 can be positioned, thereby improving the installation firmness of the winding 200.

[0060] The stator core 100 provided in this embodiment, the mounting groove 110 and the cooling channel 150 are directly formed on the core punching sheet. The punching die is relatively simple and can be formed by one punching, which effectively reduces the manufacturing cost of the stator core 100.

[0061] Embodiment 2

[0062] refer to Figure 7 , Figure 8 and Fig. 9The difference between this embodiment and the first embodiment is that the insulating sleeve 210 is tightly connected to the inner wall of the stator yoke 130 and the two side walls of two adjacent stator teeth 140 close to each other, and the insulating sleeve 210 surrounds the installation groove 110; the coil 220 is inserted into the insulating sleeve 210, and the coil 220 is tightly connected to a plurality of limiting protrusions 120. That is, the insulating sleeve 210 is installed on the inner wall of the stator core 100, the insulating sleeve 210 is arranged in an annular shape, and the installation groove 110 is surrounded by the insulating sleeve 210. By tightly connecting the insulating sleeve 210 with the stator yoke 130 and the stator teeth 140 of the stator core 100, the installation firmness between the insulating sleeve 210 and the stator core 100 is improved. The inner wall of the insulating sleeve 210 is provided with a limiting protrusion 120 and a cooling channel 150. The limiting protrusion 120 is directly connected to the coil 220, further improving the positioning effect of the coil 220 and suppressing the displacement of the coil 220 relative to the stator core 100. At the same time, the cooling channel 150 is located in the insulating sleeve 210, and the coolant in the cooling channel 150 is in direct contact with the coil 220, further improving the cooling effect of the coil 220.

[0063] The insulating sleeve 210 includes a first insulating portion 211, a second insulating portion 212, a third insulating portion 213, and a fourth insulating portion 214 connected end to end along the circumferential direction of the coil 220. The outer wall of the first insulating portion 211 is tightly connected to the inside of the stator yoke 130, the second insulating portion 212 and the third insulating portion 213 are tightly connected to the two side walls of two adjacent stator teeth 140 respectively, and the fourth insulating portion 214 is connected between the two side walls of two adjacent stator teeth 140. Specifically, the first insulating portion 211, the second insulating portion 212, the third insulating portion 213, and the fourth insulating portion 214 of the insulating sleeve 210 are all connected to the stator core 100 to improve the connection reliability between the insulating sleeve 210 and the stator core 100.

[0064] Figure 7 In the embodiment, a plurality of limiting protrusions 120 are symmetrically provided on the second insulating portion 212 and the third insulating portion 213 , that is, a plurality of limiting protrusions 120 are radially symmetrically provided on the insulating sleeve 210 to position the two sides of the coil 220 . Fig.10 In the embodiment, a plurality of limiting protrusions 120 are symmetrically provided on the first insulating portion 211 and the fourth insulating portion 214 , which can also realize positioning of both sides of the coil 220 and improve the installation firmness of the coil 220 .

[0065] Specifically, multiple limiting protrusions 120 may be symmetrically arranged on the second insulating portion 212 and the third insulating portion 213 , and multiple limiting protrusions 120 may be symmetrically arranged on the first insulating portion 211 and the fourth insulating portion 214 to further improve the positioning effect of the coil 220 .

[0066] refer to Figure 8 and Fig. 9 In the motor stator provided in this embodiment, part of the first insulating part 211, the second insulating part 212 and part of the fourth insulating part 214 are connected to form a first skeleton 215, and another part of the first insulating part 211, the third insulating part 213 and another part of the fourth insulating part 214 are connected to form a second skeleton 216, and the first skeleton 215 and the second skeleton 216 are arranged separately. Specifically, the first skeleton 215 and the second skeleton 216 are radially symmetrical, and a plurality of limiting protrusions 120 are symmetrically protruded on the second insulating part 212 and the third insulating part 213. The first skeleton 215 and the second skeleton 216 are engaged by limiting the internal and external teeth, and the first skeleton 215 and the second skeleton 216 are connected to form a mounting groove 110. The outer walls of the first skeleton 215 and the second skeleton 216 are close to the inner wall of the stator core 100, thereby suppressing the relative displacement between the first skeleton 215 and the second skeleton 216 and the stator core 100. The coil 220 is installed in the first skeleton 215 and the second skeleton 216, and the coolant in the cooling channel 150 directly cools the coil 220. The coil 220 fits tightly with the limiting protrusion 120, which prevents the coil 220 from generating relative displacement in the first skeleton 215 and the second skeleton 216. In this way, the positions of the coil 220, the insulating sleeve 210 and the stator core 100 are stable, and there is no relative displacement. The insulating sleeve 210 is arranged as a separate first skeleton 215 and a second skeleton 216 to achieve demolding in a direction perpendicular to the axial direction of the stator core 100. Among them, the first skeleton 215 and the second skeleton 216 have the same wall thickness along the axial direction of the stator core 100, so that the cross-sectional area of ​​the cooling channel 150 is consistent along the axial direction of the stator core 100, and the cooling effect is better.

[0067] refer to Figure 8 and Fig.11 In another embodiment, part of the second insulating portion 212, the first insulating portion 211 and part of the third insulating portion 213 are connected to form a first skeleton 215, and another part of the second insulating portion 212, the fourth insulating portion 214 and another part of the third insulating portion 213 are connected to form a second skeleton 216, and the first skeleton 215 and the second skeleton 216 are arranged separately. Specifically, the connection position of the first skeleton 215 and the second skeleton 216 is located at the stator tooth portion 140. In order to prevent the coolant in the cooling channel 150 from overflowing from the connection position of the first skeleton 215 and the second skeleton 216, a plurality of limiting protrusions 120 are symmetrically protruded on the first insulating portion 211 and the fourth insulating portion 214. The cooling channel 150 is also located on the first insulating portion 211 and the fourth insulating portion 214, so as to support both sides of the coil 220 and cool the coil 220.

[0068] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0069] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A stator core, characterized in that: The stator core is provided with an axially extending mounting groove, which is suitable for accommodating a winding. A plurality of limiting protrusions are provided on the groove wall of the mounting groove, which are suitable for abutting against the winding, and at least two of the limiting protrusions are symmetrically arranged on the groove walls on both sides of the mounting groove.

2. The stator core according to claim 1, characterized in that: The winding comprises an insulating sleeve and a coil, wherein the insulating sleeve is sleeved on the coil and is tightly connected to the coil, and the plurality of limiting protrusions are suitable for abutting against the outer wall of the insulating sleeve.

3. The stator core according to claim 1, characterized in that: The stator core comprises a stator yoke and a plurality of stator teeth, wherein the plurality of stator teeth are convexly arranged on the inner wall of the stator yoke at intervals along the circumferential direction of the stator core, each stator tooth extends along the axial direction of the stator core, and the region between two adjacent stator teeth forms the mounting groove; The plurality of limiting protrusions are symmetrically arranged on two side walls of two adjacent stator teeth portions that are close to each other.

4. The stator core according to claim 1, characterized in that: The installation groove is spaced apart from the radial outer side wall of the stator core, and the installation groove is spaced apart from the radial inner side wall of the stator core. At least two limiting protrusions are symmetrically arranged on two groove walls of the installation groove that are radially opposite to each other along the stator core.

5. The stator core according to claim 3 or 4, characterized in that: A plurality of the limiting protrusions are respectively arranged on the groove walls on both sides of the installation groove, and a cooling channel is formed in the area between two adjacent limiting protrusions on the same groove wall of the installation groove.

6. The stator core according to claim 5, characterized in that: A plurality of cooling channels are arranged on the same slot wall of the installation slot, and the size of any one of the cooling channels in the radial direction of the stator core is larger than the size of any one of the limiting protrusions in the radial direction of the stator core.

7. The stator core according to claim 6, characterized in that: The cross-sectional area of ​​any one of the cooling channels in a direction perpendicular to the axial direction of the stator core is consistent.

8. The stator core according to claim 3, characterized in that: A plurality of the limiting protrusions are respectively arranged on the groove walls on both sides of the installation groove, and the protruding heights of the plurality of the limiting protrusions located on the same groove wall of the installation groove gradually increase from inside to outside in the radial direction of the stator core.

9. An insulating sleeve, characterized in that: The insulating sleeve is provided with an installation groove extending in the axial direction, and the installation groove is suitable for accommodating the coil. A plurality of limiting protrusions are provided on the groove wall of the installation groove at intervals, and the plurality of limiting protrusions are suitable for abutting against the coil. At least two of the limiting protrusions are symmetrically arranged on the groove walls on both sides of the installation groove.

10. The insulating sleeve according to claim 9, characterized in that: The insulating sleeve comprises a first insulating portion, a second insulating portion, a third insulating portion and a fourth insulating portion which are connected end to end in sequence, wherein the first insulating portion is adapted to be tightly connected to the inner wall of the stator yoke portion of the stator core, the second insulating portion and the third insulating portion are adapted to be tightly connected to two side walls of two adjacent stator teeth of the stator core respectively, and the fourth insulating portion is adapted to be connected between two side walls of two adjacent stator teeth of the stator core which are close to each other; A plurality of the limiting protrusions are symmetrically provided on the second insulating portion and the third insulating portion, and / or a plurality of the limiting protrusions are symmetrically provided on the first insulating portion and the fourth insulating portion.

11. The insulating sleeve according to claim 10, characterized in that: Part of the first insulating part, the second insulating part and part of the fourth insulating part are connected to form a first skeleton, another part of the first insulating part, the third insulating part and another part of the fourth insulating part are connected to form a second skeleton, and the first skeleton and the second skeleton are separately arranged.

12. The insulating sleeve according to claim 10, characterized in that: Part of the second insulating part, the first insulating part and part of the third insulating part are connected to form a first skeleton, another part of the second insulating part, the fourth insulating part and another part of the third insulating part are connected to form a second skeleton, and the first skeleton and the second skeleton are arranged separately.

13. A motor stator, characterized in that: It comprises a winding and a stator core as claimed in any one of claims 1 to 8, wherein the winding is inserted into the mounting groove, and the winding is connected to a plurality of the limiting protrusions; or, It comprises a stator core, a coil and an insulating sleeve as described in any one of claims 9 to 12, wherein the insulating sleeve is inserted in the stator core, the coil is inserted in the mounting groove, and the coil is connected to a plurality of the limiting protrusions.

14. A motor, characterized in that: Comprising the motor stator as claimed in claim 13.

15. A powertrain, characterized in that: Comprising the motor as claimed in claim 14.

16. A vehicle, characterized in that: Comprising the electric machine as claimed in claim 14 or the powertrain as claimed in claim 15.

Images