Core punching sheet, stator core, motor and new energy vehicle

Abstract

The present application relates to the technical field of permanent magnet motors, and provides a core punching sheet, a stator core, a motor and a new energy vehicle, wherein the core punching sheet comprises: a plurality of welding grooves located at the periphery, the welding groove comprises: a transition section located at the connection between the two sides of the welding groove and the periphery of the core punching sheet, the transition section being a rounded corner; a welding section located at the bottom of the welding groove, the welding section protruding outward; and a connecting section located at the bottom of the welding groove, the two connecting sections are respectively located on both sides of the welding section, and a gap is formed between the side of the welding groove and the welding section. When in use, the welding groove with the welding section can effectively block the flow of magnetic lines of force at the welding groove when the magnetic density is not saturated, and reduce eddy current losses; when the magnetic density is saturated, it can reduce the concentration and mutation of the electromagnetic excitation force, thereby reducing the motor noise.

Description

Technical Field

[0001] The present application relates to the field of permanent magnet motor equipment, and in particular to a core punching sheet, a stator core, a motor and a new energy vehicle. Background Art

[0002] Automobile permanent magnet synchronous motors have high power density and small size. Usually, under high current, serious electromagnetic saturation will occur in the stator yoke of the motor, which will increase the electromagnetic excitation force, increase heat and reduce efficiency.

[0003] To reduce eddy current losses in the motor stator, see Figure 1 In the prior art, thinner stator sheets 1 are usually stacked into a certain thickness, and then the positions of the welding grooves 11 are welded to form an integrated structure of the multi-layer stator sheets 1. The welding grooves 11 form a continuous structure, which is easy to form a current conduction path under the action of the induced magnetic flux, thereby increasing eddy current loss. Since the magnetic flux of the stator yoke is saturated, the magnetic lines of force of the stator yoke are arranged along the edge of the stator. The shape of the welding grooves 11 has a significant effect on the magnetic lines of force, resulting in changes in the electromagnetic excitation force, thereby affecting the motor noise. Summary of the invention

[0004] A main purpose of the present application is to overcome the problem of the above-mentioned prior art that the stator welding part increases eddy current loss and affects the motor noise, and to provide a core punching sheet that can effectively reduce the electromagnetic noise of the motor and the eddy current loss at the stator welding slot.

[0005] Another main purpose of the present application is to overcome the problem of the above-mentioned prior art that the stator welding part increases eddy current loss and affects the motor noise, and to provide a stator core that can effectively reduce the electromagnetic noise of the motor and the eddy current loss at the stator welding slot.

[0006] Another main purpose of the present application is to overcome the problem of the above-mentioned prior art that the stator welding part increases eddy current loss and affects the motor noise, and to provide a motor that can effectively reduce the electromagnetic noise of the motor and the eddy current loss at the stator welding slot.

[0007] Another main purpose of the present application is to overcome the problem of the above-mentioned prior art that the stator welding part increases eddy current loss and affects the motor noise, and to provide a new energy vehicle that can effectively reduce the electromagnetic noise of the motor and the eddy current loss at the stator welding slot.

[0008] According to one aspect of the present application, there is provided an iron core punching sheet, comprising a plurality of welding grooves located on the periphery, wherein the welding groove comprises: a transition section located at the connection between the two side edges of the welding groove and the periphery of the iron core punching sheet, the transition section being a rounded corner; a welding section located at the bottom of the welding groove, the welding section protruding outward; and a connecting section located at the bottom of the welding groove, the two connecting sections being respectively located on both sides of the welding section, forming a gap between the side edges of the welding groove and the welding section.

[0009] Optionally, in a magnetic density saturation state, the minimum curvature radius of the magnetic force lines in the core punching sheet is R1; in a magnetic density unsaturation state, the maximum curvature radius of the magnetic force lines in the core punching sheet is R2, wherein R1>R2;

[0010] The transition section radius is R3, wherein R1>R3≥R2;

[0011] The width of the connecting section is D, wherein R1>D≥R2.

[0012] Optionally, the radius of the transition section is the same as the minimum width of the connecting section.

[0013] Optionally, the radius of the transition section is within 1.2-1.5 mm.

[0014] Optionally, the outer contour structure of the welding section is arc-shaped, and the radius of the arc is twice the radius of the transition section.

[0015] Optionally, the radius of the welding section is within 2.5-3.2 mm.

[0016] Optionally, the connecting section includes a first connecting section and a second connecting section; the first connecting section is connected to the transition section, the second connecting section is connected to the welding section, and an obtuse angle is formed between the first connecting section and the second connecting section; the length of the second connecting section is the minimum width of the connecting section.

[0017] Optionally, the length of the first connecting segment is twice that of the second connecting segment.

[0018] Optionally, the length of the first connecting segment is within a range of 1.8-2.2 mm, and the length of the second connecting segment is within a range of 1.0-1.3 mm.

[0019] Optionally, an acute angle is formed between the first connecting sections located on both sides of the welding section.

[0020] Optionally, welding is performed in the welding groove to form a welding surface; the welding surface has a plurality of welding points, and the plurality of welding points are welded to form the welding section.

[0021] Optionally, the periphery of the welding section is located within the periphery of the core punching sheet.

[0022] According to another aspect of the present application, a stator core is provided, which is formed by stacking a plurality of core punching sheets, and the welding grooves on the plurality of core punching sheets are connected by welding.

[0023] According to another aspect of the present application, a motor is provided, including a stator, wherein the stator includes the above-mentioned stator core.

[0024] According to another aspect of the present application, a new energy vehicle is provided, comprising the motor described above, which is a power motor.

[0025] It can be seen from the above technical solutions that the advantages and positive effects of the core punching sheet, stator core, motor and new energy vehicle of the present application are:

[0026] The present application provides an iron core punching sheet. When the magnetic flux density at the weld groove is not saturated, the magnetic flux lines passing through the iron core punching sheet will not cross the connecting section at the bottom of the weld groove, and all the magnetic flux lines will pass through the solid part of the iron core punching sheet, thereby effectively blocking the flow of magnetic flux lines at the weld groove, and the weld groove will not form a continuous structure, and will not form a current conduction path under the action of the induced magnetic flux. At this time, there is almost no eddy current loss at the weld groove, and the heating of the motor is effectively reduced; when the magnetic flux density saturation at the weld groove is too high, the magnetic flux lines at the weld groove pass through the transition section and are highly concentrated there, so that part of the magnetic flux lines begin to cross the connecting section along the bottom of the connecting section and pass through the welding section. This effect is equivalent to an increase in the equivalent distance of the iron core punching sheet at the weld groove, thereby alleviating the degree of magnetic flux saturation at the weld groove and tending to be uniform in the circumferential radial direction, reducing the concentration and mutation of the electromagnetic excitation force, and thus reducing the motor noise.

[0027] The present application provides a stator core, including the aforementioned core punching sheets, and its beneficial effects are consistent with the aforementioned core punching sheets. In addition, the stator core is formed by stacking the core punching sheets to a certain thickness and then welding them into an integrated structure at welding grooves. Compared with riveting fixation, welding processing is more convenient and can better enhance the structural strength.

[0028] The present application provides a motor, including a stator, wherein the stator has the aforementioned stator core, and its beneficial effects are consistent with those of the aforementioned stator core, which will not be described in detail here.

[0029] The present application provides a new energy vehicle, including the aforementioned motor, and its beneficial effects are consistent with those of the aforementioned motor, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 It is a structural schematic diagram of a stator fragment in the prior art;

[0033] Figure 2 is a schematic structural diagram of an iron core punching sheet according to an exemplary embodiment;

[0034] Figure 3 is an enlarged view of a core punching sheet at point A according to an exemplary embodiment;

[0035] Figure 4 It is a distribution diagram of magnetic lines of force at the welding groove when the magnetic density is too high in the prior art;

[0036] Figure 5 is a magnetic force line distribution diagram when the magnetic density of a core punching sheet is too high according to an exemplary embodiment;

[0037] Figure 6 It is a magnetic density distribution diagram at the welding groove when the magnetic density is too high in the prior art;

[0038] Figure 7 is a magnetic density distribution diagram of a core punching sheet when the magnetic density is too high according to an exemplary embodiment;

[0039] Figure 8 It is a graph of the amplitude of electromagnetic force variation at the welding groove in the prior art;

[0040] Fig. 9 FIG. 4 is a diagram showing an electromagnetic force variation amplitude of an iron core punching sheet according to an exemplary embodiment.

[0041] The reference numerals are described as follows:

[0042] 1. Stator fragments; 11. Welding slots;

[0043] 2. Iron core punching sheet; 21. Stator teeth; 22. Stator yoke; 23. Stator welding groove; 231-transition section; 232. Welding section; 233. Connecting section; 2331. First connecting section; 2332. Second connecting section. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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 making creative work are within the scope of protection of this application.

[0045] Reference Figure 2-Figure 9 , Figure 2 is a schematic structural diagram of an iron core punching sheet according to an exemplary embodiment; Figure 3 is an enlarged view of a core punching sheet at point A according to an exemplary embodiment; Figure 4 It is a distribution diagram of magnetic lines of force at the welding groove when the magnetic density is too high in the prior art; Figure 5 is a magnetic force line distribution diagram when the magnetic density of a core punching sheet is too high according to an exemplary embodiment; Figure 6 It is a magnetic density distribution diagram at the welding groove when the magnetic density is too high in the prior art; Figure 7 is a magnetic density distribution diagram of a core punching sheet when the magnetic density is too high according to an exemplary embodiment; Figure 8 It is a graph of the amplitude of electromagnetic force variation at the welding groove in the prior art; Fig. 9 FIG. 4 is a diagram showing an electromagnetic force variation amplitude of an iron core punching sheet according to an exemplary embodiment.

[0046] Automotive motors are generally high-power and small in size. The motor stator yoke is prone to severe electromagnetic saturation. Due to the large size difference between the welding slot position and the non-welding slot position, the magnetic flux density changes suddenly, making the electromagnetic excitation force larger and the motor noise higher. At the same time, the magnetic lines pass through the welding slot, which increases the stator eddy current loss and reduces the efficiency. At present, in order to reduce the electromagnetic excitation force and the eddy current loss of the stator, the welding slot is generally set to be thinner, which easily causes the stator welding strength to be insufficient and cannot fundamentally solve the noise and efficiency problems.

[0047] In order to solve the above technical problems, the present application provides a core punching sheet 2. Figure 2-Figure 3 , Figure 2-Figure 3 A core punching sheet 2 that can embody the principle of the present application is representatively shown, including a plurality of welding grooves 23 located on the periphery, the welding groove 23 including: a transition section 231, located at the connection between the two side edges of the welding groove 23 and the periphery of the core punching sheet, the transition section 231 being a rounded corner; a welding section 232, located at the bottom of the welding groove 23, the welding section 232 protruding outward; and a connecting section 233, located at the bottom of the welding groove 23, the two connecting sections 233 are respectively located on both sides of the welding section 232, and a gap is formed between the side edges of the welding groove 23 and the welding section 232.

[0048] The present application provides a welding groove 23. When the magnetic flux density at the welding groove is not saturated, due to the gap formed between the side of the welding groove 23 and the welding section 232, the magnetic flux lines passing through the core punching sheet 2 will not cross the inwardly recessed connecting section 233, and the magnetic flux lines will all pass through the solid part of the core punching sheet 2, thereby effectively blocking the flow of magnetic flux lines at the welding groove 23. The welding groove 23 will not form a continuous structure, and will not form a current conduction path under the action of the induced magnetic flux. At this time, there is almost no eddy current loss at the welding groove 23, and the heating of the motor is effectively reduced. When the magnetic flux density saturation at the welding groove is too high, please refer to Figure 4-Figure 7 The magnetic lines of force at the welding groove 23 pass through the transition section 231 and are highly concentrated there, so that part of the magnetic lines of force begin to cross the connecting section 233 along the minimum groove width of the connecting section 233 and pass through the welding section 232. This effect is equivalent to an increase in the equivalent distance of the iron core at the welding groove 23, thereby alleviating the magnetic flux saturation at the welding groove and making it uniform in the circumferential radial direction, reducing the concentration and mutation of the electromagnetic excitation force, and thus reducing the motor noise.

[0049] See also Figure 2 , Figure 2 A core punching sheet 2 that can embody the principle of the present application is representatively shown in the figure. The core punching sheet of the present application includes a welding groove 23, a stator tooth 21, and a stator yoke 22 surrounding the stator tooth 21 in the circumferential direction; the welding groove 23 is formed on the stator yoke 22, and the transition section 231 is connected to the stator yoke 22. The main part of the core punching sheet 2 is composed of a silicon steel sheet with a stator groove formed by stamping or cutting and a plurality of welding grooves 23 opened on the outer circle of the silicon steel sheet, wherein the stator teeth 21 and the stator yoke 22 are formed on the silicon steel sheet, and the welding grooves 23 are evenly distributed on the stator yoke 22, so that the stator periphery is subjected to uniform force after welding.

[0050] In the optional scheme of this embodiment, in the saturated state, the minimum curvature radius of the magnetic lines of force in the core punching sheet 2 is R1, and in the unsaturated state, the maximum curvature radius of the magnetic lines of force in the core punching sheet 2 is R2. Since the magnetic lines of force in the saturated state are close to a straight line, while the magnetic lines of force in the unsaturated state are curves with a larger curvature, therefore, R1>R2.

[0051] According to: in the saturated state, the magnetic lines of force can cross the gap and reduce eddy current losses; in the unsaturated state, the magnetic lines of force cannot cross the gap and can only pass through the solid part of the core punching sheet 2. It can be deduced that: the radius of the transition section 231 is R3, where R1>R3≥R2, and the width of the connecting section 233 is D, where R1>D≥R2.

[0052] In the optional solution of this embodiment, see Figure 3The connecting section 233 includes a first connecting section 2331 and a second connecting section 2332; the first connecting section 2331 is connected to the transition section 231, the second connecting section 2332 is connected to the center circle, and the first connecting section 2331 and the second connecting section 2332 form an obtuse angle, and the first connecting section 2331 and the second connecting section 2332 are both straight lines.

[0053] It should be understood that there is an angle of 100-110° between the first connecting section 2331 and the second connecting section 2332. In order to ensure that the magnetic lines of force do not pass through the weld groove 23 when the magnetic density is small, and the magnetic lines of force pass through the weld groove 23 when the magnetic density is large, the bottom width of the connecting section 233 close to the stator entity is the smallest. Therefore, there needs to be an obtuse angle between the first connecting section 2331 and the second connecting section 2332. If the angle is greater than 110°, only a small number of magnetic lines of force can pass through the gap in the connecting section 233, and the degree of magnetic density saturation cannot be alleviated. If the angle is less than 100 degrees, the width of the recessed part of the connecting section 233 tends to be consistent. When the magnetic density is low, the weld groove 23 will cross the magnetic lines of force, thereby forming a continuous structure and increasing eddy current losses. Therefore, when the angle is 100-110°, it can reduce both eddy current losses and motor noise.

[0054] For details, please refer to Figure 3 The transition section 231 is tangent to the outer circle of the stator and the first connecting section 2331 respectively, and the two ends of the welding section 232 are tangent to the second connecting section 2332 respectively. There is an arc transition between the first connecting section 2331 and the second connecting section 2332. The arc adopts a process arc to ensure the assembly of the first connecting section 2331 and the second connecting section 2332 while improving the integrity of the appearance of the welding groove 23.

[0055] In the optional scheme of this embodiment, the first connecting sections 2331 on both sides of the welding section 232 are symmetrically distributed along the center line of the stator tooth 21. The two first connecting sections 2331 are symmetrically arranged so that the stator welds are symmetrically distributed along the same stator tooth 21 on both sides, ensuring that the stress conditions at all locations are consistent after welding. The first connecting sections 2331 on both sides of the welding section 232 form an acute angle, which is 35-40°. Preferably, the angle is 35°. If the angle is less than 35°, the volume of the weld groove 23 in the core sheet 2 is too small, and it is difficult to ensure the welding strength, and the magnetic density can be alleviated. If the angle is greater than 40°, the volume of the weld groove 23 in the core sheet 2 is too large, so that the volume of the solid part is too small, affecting the overall structural strength of the core sheet 2. Therefore, it is optimal when the angle of the first connecting sections 2331 on both sides of the same welding section 232 is 35°.

[0056] In the optional scheme of this embodiment, a welding surface is formed in the welding groove 23 of the present application, and the welding surface has multiple welding points, and the welding points are formed on the welding section 232. The welding section 232 is a center circle; wherein the center of the center circle is located on the center line of the stator tooth 21, and the circumference of the center circle is located within the periphery of the core punching 2. Since the center of the center circle is located on the center line of the stator tooth 21, it can be seen that the center circle is arranged corresponding to the stator tooth 21 to ensure that the stator entity part is evenly distributed in the radial direction. The circumference of the center circle is within the periphery of the core punching 2, and the protruding part after welding is also within the periphery of the core punching 2, which does not affect the roundness of the core punching 2.

[0057] In the optional scheme of this embodiment, the length of the second connecting section 2332 is the minimum width of the connecting section 233, and the width is the same as or close to the radius of the transition section 231. The radius of the center circle is twice the radius of the transition section 231. The length of the first connecting section 2331 is twice the length of the second connecting section 2332. Specifically, the radius of the transition section 231 is 1.2-1.5mm, and the length of the second connecting section 2332 is 1-1.3mm. The length of the second connecting section 2332 is close to the radius of the transition section 231 to ensure that when the magnetic density is large, the magnetic lines of force pass through the connecting section 233, and when the magnetic density is small, the magnetic lines of force pass through the stator entity. The length of the first connecting section 2331 is 1.8-2.2 mm. If the length of the first connecting section 2331 is less than 1.8 mm, the depth of the connecting section 233 cannot be guaranteed, the welding strength is poor, and the stator core is easy to scatter. If the length of the connecting section 233 is greater than 2.2 mm, the position of the welding groove 23 is close to the stator teeth 21, which is easy to cause interference. Therefore, the length of the first connecting section 2331 is 1.8-2.2 mm, and the welding effect is guaranteed without affecting the stator teeth 21. The radius of the center circle is between 2.5-3.2 mm. If the radius of the center circle is less than 2.5 mm, when the magnetic density is large, the stator entity part cannot pass through enough magnetic lines of force, and it is difficult to meet the welding strength during welding. If the radius of the center circle is greater than 3.2 mm, the gap can only pass through fewer magnetic lines of force, so that the magnetic density cannot be alleviated. Therefore, the radius of the center circle is optimal when it is 2.5-3.2 mm.

[0058] It should be understood here that the connection angles of the welding section 232, the connecting section 233 and the transition section 231 of the present application are all examples. Under different process conditions, other parameters can also be selected, which will not be repeated here.

[0059] In the optional solution of this embodiment, the number of welding slots 23 is the quotient of the number of stator slots and the number of motor pole pairs. The number of stator slots is linearly related to the number of motor pole pairs. The more the number of stator slots, the more the number of motor pole pairs is related to the speed and stability of the motor. The more pole pairs, the lower the speed and the more stable the operation.

[0060] The present application also provides a stator core, which is formed by stacking a plurality of core punching sheets 2, and the welding grooves 23 on the plurality of core punching sheets 2 are welded and connected. The stator core provided by the present application has the same beneficial effects as the core punching sheets 2 described above. In addition, the stator core is formed by stacking the core punching sheets 2 to a certain thickness, and then welding them into an integrated structure at the welding grooves 23. Compared with riveting fixation, welding processing is more convenient and can better enhance the structural strength.

[0061] See also Figure 8-Figure 9 The difference between the present application and the prior art is that the prior art always has eddy current loss at the welding slot, while the iron core punching sheet 2 of the present application can make the motor have almost no eddy current loss at the welding slot before the stator saturation point. At the same time, the present application can effectively reduce the sudden change of magnetic flux density at the welding slot caused by stator saturation, thereby reducing the concentration of electromagnetic excitation force. Figure 5 By using the welding groove 23 of the present application, the amplitude of the electromagnetic force of the motor peak order (which is 36th order in this embodiment) can be effectively reduced by about 10%, which has a significant effect on reducing the motor noise.

[0062] The present application also provides a motor, including a stator, wherein the stator includes the above-mentioned stator core. The effect of the motor is the same as that of the stator core, and will not be described in detail here.

[0063] The present application also provides a new energy vehicle, including a motor, which is a power motor. The new energy vehicle has the same effect as the motor, which will not be described in detail here.

[0064] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0065] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An iron core punching sheet (2), comprising a plurality of welding grooves (23) located at the periphery, characterized in that: The welding groove (23) comprises: A transition section (231) is located at the connection between the two side edges of the welding groove (23) and the periphery of the iron core punching sheet, and the transition section (231) is a rounded corner; A welding section (232) is located at the bottom of the welding groove (23), and the welding section (232) protrudes outward; and A connecting section (233) is located at the bottom of the welding groove (23), and two connecting sections (233) are respectively located on both sides of the welding section (232), so that a gap is formed between the side of the welding groove (23) and the welding section (232); In a magnetic density saturation state, the minimum curvature radius of the magnetic force lines in the iron core punching sheet (2) is R1; in a magnetic density unsaturation state, the maximum curvature radius of the magnetic force lines in the iron core punching sheet (2) is R2, wherein R1>R2; The transition section (231) has a radius of R3, wherein R1>R3≥R2; The width of the connecting section (233) is D, wherein R1>D≥R2.

2. An iron core punching sheet (2) according to claim 1, characterized in that: The radius of the transition section (231) is the same as the minimum width of the connecting section (233).

3. An iron core punching sheet (2) as claimed in claim 2, characterized in that: The radius of the transition section (231) is within 1.2-1.5 mm.

4. The core punching sheet (2) according to claim 1, characterized in that: The outer contour structure of the welding section (232) is arc-shaped, and the radius of the arc is twice the radius of the transition section (231).

5. An iron core punching sheet (2) as claimed in claim 4, characterized in that: The radius of the welding section (232) is within 2.5-3.2 mm.

6. The core punching sheet (2) according to claim 1, characterized in that: The connecting section (233) comprises a first connecting section (2331) and a second connecting section (2332); the first connecting section (2331) is connected to the transition section (231), the second connecting section (2332) is connected to the welding section (232), and an obtuse angle is formed between the first connecting section (2331) and the second connecting section (2332); the length of the second connecting section (2332) is the minimum width of the connecting section.

7. An iron core punching sheet (2) as claimed in claim 6, characterized in that: The length of the first connecting segment (2331) is within the range of 1.8-2.2 mm, and the length of the second connecting segment (2332) is within the range of 1.0-1.3 mm.

8. An iron core punching sheet (2) as claimed in claim 6, characterized in that: An angle is formed between the first connecting sections (2331) located on both sides of the welding section (232), and the angle is an acute angle.

9. The core punching sheet (2) according to claim 1, characterized in that: A welding surface is formed by welding in the welding groove (23); the welding surface has a plurality of welding points, and the plurality of welding points are welded and formed on the welding section (232).

10. An iron core punching sheet (2) according to claim 9, characterized in that: The periphery of the welding section (232) is located inside the periphery of the iron core punching sheet (2).

11. A stator core, characterized in that: It comprises a plurality of core punching sheets (2) as described in any one of claims 1 to 10, wherein the plurality of core punching sheets (2) are stacked to form the stator core, and the welding grooves (23) on the plurality of core punching sheets (2) are welded together.

12. A motor, characterized in that: It comprises a stator, wherein the stator comprises a stator core as claimed in claim 11.

13. A new energy vehicle, characterized in that: It includes a motor as described in claim 12, wherein the motor is a power motor.

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