Stator punching, motor stator, motor

Abstract

The present invention provides a stator punching sheet, a motor stator, and a motor, wherein the stator punching sheet includes a plurality of punching sheet units, each punching sheet unit includes an inner tooth portion, an outer tooth portion, and a yoke portion connected between the inner tooth portion and the outer tooth portion, and the yoke portions respectively provided by two adjacent punching sheet units are connected as a whole through a yoke portion connecting bridge, and the stator punching sheet has a linear arrangement state and a circular arrangement state, when the stator punching sheet is in the linear arrangement state, there is an overlapping portion between the two adjacent outer tooth portions in the first direction, and when the stator punching sheet is in the circular arrangement state, an outer notch of an outer tooth slot is formed between the two adjacent outer tooth portions, and the first direction is the direction from the outer tooth portion to the inner tooth portion in the linear arrangement state. The present invention can make the width of the outer tooth portion larger, so that the double-tooth stator punching sheet can adopt a straight strip manufacturing method, ensuring that the width of the outer notch of the outer tooth slot of the stator punching sheet after the stator punching sheet is circular can be relatively small, thereby ensuring the motor performance.

Description

Technical Field

[0001] The invention belongs to the technical field of motor design, and in particular relates to a stator punching sheet, a motor stator and a motor. Background Art

[0002] In order to achieve high torque output without increasing the size of the motor, existing permanent magnet motors usually use dual-rotor motors. The stator core of the dual-rotor motor is a double-tooth core, divided into an outer tooth portion and an inner tooth portion. The outer tooth portion and the outer magnetic ring form an armature, and the inner tooth portion and the inner magnetic ring form an armature.

[0003] The stator types in the prior art are generally divided into four types: full circle type, block type, coiled type, and straight bar type. The full circle type has low material utilization and slow winding speed; each stator unit of the block type needs to be wound separately, and there are many thread ends after the assembly, the process is numerous and complicated, and the rounding accuracy is low; the coiled type has a complex structure and high process difficulty; the straight bar type has comprehensive advantages in all the above aspects, so it is the most widely used in fan motors.

[0004] The double-tooth stator core in the prior art is generally in the form of a full circle, a semicircle, or a block splicing form. Figure 1 As shown in the figure, when the full-circle stator core is arranged, the waste area at the inner circle and the waste area at the junction of the outer circle and the outer circle is large, and the material utilization rate is very low, resulting in an increase in the cost of the motor; the forming process of the block-jointed stator core is numerous and complicated, requiring a large number of production personnel, and the production efficiency is low. Since the radial length of the double-tooth stator punching sheet (stator core) is large, the tooth slot width formed between the two adjacent outer teeth of the straight-bar stator core after rounding is limited by the adjacent limitation before rounding (in the straight-bar state) and is larger (such as Figure 2 As shown, the tooth top length of the outer tooth portion is limited by the outer diameter of the yoke, and the length is consistent with the length of the yoke, which is equivalent to limiting the minimum slot width of the outer tooth portion after the core is rounded. Too large a slot will lead to a decrease in the performance of the motor), which will lead to a decrease in the performance of the motor. Therefore, for double-tooth stator punching sheets, the straight bar type is less used at present. Summary of the invention

[0005] Therefore, the present invention provides a stator punching sheet, a motor stator, and a motor, which can solve the technical problem in the prior art that the width of the outer tooth slots of the double-toothed stator punching sheets is too large after being rounded in a straight strip manner, resulting in low motor performance.

[0006] In order to solve the above problems, the present invention provides a stator punching sheet, comprising a plurality of punching sheet units, each of which comprises an inner tooth portion, an outer tooth portion and a yoke portion connected between the inner tooth portion and the outer tooth portion, the yoke portions respectively provided by two adjacent punching sheet units are connected as a whole through a yoke connecting bridge, the stator punching sheet has a linear arrangement state and a circular arrangement state, when the stator punching sheet is in the linear arrangement state, there is an overlapping portion between two adjacent outer tooth portions in a first direction, when the stator punching sheet is in the circular arrangement state, an outer notch of an outer tooth groove is formed between two adjacent outer tooth portions, and the first direction is the direction from the outer tooth portion to the inner tooth portion in the linear arrangement state.

[0007] In some embodiments, the side where the outer tooth portion is located is defined as the outer side, and the side where the inner tooth portion is located is defined as the inner side, and the outer tooth portion is tilted so that in the linear arrangement state, the first end of the outer tooth portion is located on the outer side of the second end of the outer tooth portion adjacent to it, and the second end of the outer tooth portion is located on the inner side of the first end of the outer tooth portion adjacent to it.

[0008] In some embodiments, the inner side wall of the tooth boot of the external tooth portion is projected onto a radial plane formed after the stator punching sheet is circled as a first straight line, a straight line perpendicular to the first straight line and the center line of the tooth portion of the external tooth portion is a second straight line, an angle formed between the first straight line and the second straight line is a, 0°<a≤5°; and / or, in the circular arrangement state, a radial thickness of the first end is smaller than a radial thickness of the second end, and an avoidance gap is configured on the outer side of the second end.

[0009] In some embodiments, in the circular arrangement state, an inner tooth groove is formed between two adjacent inner tooth portions, and the difference between the groove area of ​​the outer tooth groove and the groove area of ​​the inner tooth groove is △V, △V≤(L5 / 2) 2 *tan5°, where L5 is the maximum length of the outer tooth portion.

[0010] In some embodiments, in the linear arrangement state, opposite sides of two adjacent yokes have first concave-convex positioning structures, in the linear arrangement state, the first concave-convex positioning structures are disengaged from each other, and in the circular arrangement state, the first concave-convex positioning structures are engaged with each other.

[0011] In some embodiments, the first concave-convex positioning structure includes a guide bar on the yoke on one side and a guide groove on the yoke on the other side, the guide bar matches the guide groove, and the radial width of the guide bar is b1, the width of the yoke in the first direction is hj, b1=(20%~30%)*hj.

[0012] In some embodiments, when the stator punching sheets are in the linear arrangement state, the yoke connecting bridge has a circular rotating hole, the center of the circular rotating hole is located at the midpoint of the length of the yoke connecting bridge along the second direction, and the circular rotating hole has an opening facing the inner side, and the second direction is a direction perpendicular to the first direction.

[0013] In some embodiments, the width of the yoke connecting bridge in the first direction is h1, h1=(12%-16%)hj; and / or the guide bar is arc-shaped, and the center of the arc is concentric with the center of the circular rotating hole.

[0014] In some embodiments, in the linear arrangement state, on the yoke of the two punching units at both ends of the length of the stator punching sheet, one has a protrusion and the other has a groove, and in the circular arrangement state, the protrusion is embedded in the groove.

[0015] In some embodiments, in the rounded state, the protrusion has a radial width b2, b2 = (20% to 40%) * hj / tan (180° / Z1), where hj is the width of the yoke in the first direction, and Z1 is the number of the punching units in the stator punching sheet.

[0016] In some embodiments, in the circular arrangement state, a fitting seam is formed between the yokes of the two punching units at both ends of the length of the stator punching sheet, and the fitting gap includes an arc seam section formed between the protrusion and the groove, and a first seam section on the outside of the arc seam section and a second seam section on the inside of the arc seam section, and the first seam section and the second seam section both extend along the radial direction of the stator punching sheet after being circled and have an offset spacing in the circumferential direction of the stator punching sheet after being circled.

[0017] In some embodiments, two sides of the outer opening of the first seam section each have a welding corner.

[0018] In some embodiments, the protrusion height of the welding corner is h2, 0.2mm≤h2≤0.5mm.

[0019] In some embodiments, in the circular arrangement state, the inner circle radius corresponding to the inner tooth portion is r, the outer circle radius of the outer tooth portion is R, the radial length of the outer tooth portion is L1, the radial length of the inner tooth portion is L2, and R 2 -(R-L1) 2 =(r+L2) 2 -r 2 .

[0020] The present invention also provides a motor stator, comprising the above-mentioned stator punching sheet.

[0021] The present invention also provides a motor, comprising the motor stator mentioned above.

[0022] The present invention provides a stator punching sheet, a motor stator, and a motor. By designing the outer tooth portion to have an overlapping portion along a first direction in a linear arrangement state, the width of the outer tooth portion can be made larger, so that the double-tooth stator punching sheet can be made using a straight-bar method, ensuring that the outer slot width of the outer tooth slot of the stator punching sheet can be relatively small after the stator punching sheet is rounded, thereby ensuring the motor performance; at the same time, it can be understood that due to the use of a straight-bar method to make the double-tooth stator punching sheet, compared with the whole circle or semi-circle or block splicing method in the prior art, the manufacturing and forming process is simplified, the personnel configuration requirements are reduced, and the production effect is improved. In addition, the stator punching sheet can be rotated 180° to stagger the pattern, thereby improving the utilization rate of the core material and reducing the cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the arrangement and processing of the full-circle double-tooth stator core in the prior art;

[0024] Figure 2 It is a schematic diagram of the state of a straight bar type single tooth stator core before being rounded in the prior art;

[0025] Figure 3 This is a schematic structural diagram of the stator punching sheets in a linear arrangement state according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 A schematic diagram of some dimensions of the punching unit in FIG.

[0027] Figure 5 for Figure 3 Another part of the dimension diagram of the punching unit in FIG.

[0028] Figure 6 It is a schematic structural diagram of the stator punching sheets in a circular arrangement state according to an embodiment of the present invention;

[0029] Figure 7 for Figure 6 A partial enlarged view of the middle A;

[0030] Figure 8 It is a schematic diagram of the stator punching arrangement processing according to an embodiment of the present invention.

[0031] The reference numerals are:

[0032] 1. Punching unit; 11. Inner tooth portion; 12. Outer tooth portion; 121. Avoidance notch; 13. Yoke connecting bridge; 131. Circular rotating hole; 14. Outer tooth groove; 15. Inner tooth groove; 16. Yoke; 161. Guide bar; 162. Guide groove; 163. Protrusion; 164. Groove; 165. Welding corner; 17. Buckle point. DETAILED DESCRIPTION

[0033] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, a stator punching sheet is provided, comprising a plurality of punching sheet units 1, each punching sheet unit 1 comprising an inner tooth portion 11, an outer tooth portion 12 and a yoke portion 16 connecting the inner tooth portion 11 and the outer tooth portion 12, the yoke portions 16 respectively provided by two adjacent punching sheet units 1 are connected as a whole through a yoke portion connecting bridge 13, the stator punching sheet has a linear arrangement state and a circular arrangement state, wherein the linear arrangement state is the state before the stator punching sheet is circularly arranged, and the circular arrangement state is the state after the stator punching sheet is circularly arranged, when the stator punching sheet is in the linear arrangement state, there is an overlapping portion between two adjacent outer tooth portions 12 in the first direction, when the stator punching sheet is in the circular arrangement state, an outer notch of an outer tooth slot 14 is formed between two adjacent outer tooth portions 12, the first direction is the direction from the outer tooth portion 12 to the inner tooth portion 11 in the linear arrangement state, specifically Figure 3 Taking the orientation shown as an example, the first direction is the up-down direction, and the second direction perpendicular to the first direction is the left-right direction. In this technical solution, by designing the outer tooth portion 12 to have an overlapping portion along the first direction in a linear arrangement state, the width of the outer tooth portion 12 (specifically the tooth shoe width) can be made larger, so that the double-tooth stator punching can be made in a straight-bar manner, ensuring that the outer slot width of the outer tooth slot 14 of the stator punching can be relatively small after the stator punching is rounded, thereby ensuring the performance of the motor; at the same time, it can be understood that due to the use of a straight-bar method to make the double-tooth stator punching, compared with the whole circle or semi-circle or block splicing method in the prior art, the manufacturing process is simplified, the staffing requirements are reduced, and the production effect is improved. In addition, the stator punching can be rotated 180° to stagger the pattern (such as Figure 8 As shown), the utilization rate of core materials is improved and the cost of motor is reduced.

[0034] The side where the outer tooth portion 12 is located is defined as the outer side, and the side where the inner tooth portion 11 is located is defined as the inner side. As a preferred embodiment, the outer tooth portion 12 is tilted so that in a linear arrangement state, the first end of the outer tooth portion 12 is on the outer side of the second end of the outer tooth portion 12 adjacent thereto, and the second end of the outer tooth portion 12 is on the inner side of the first end of the outer tooth portion 12 adjacent thereto. This method achieves partial overlap of two adjacent outer tooth portions 12 in the first direction through the inner and outer tilted settings of the outer tooth portion 12, which can make the shape of the outer tooth portion 12 more symmetrical in the second direction, thereby ensuring the performance of the motor. As another feasible implementation, in the circular arrangement state, the radial thickness of the first end is smaller than the radial thickness of the second end, and the outer side of the second end is constructed with an avoidance gap 121, that is, the first end of one of the two adjacent outer teeth 12 overlaps with the avoidance gap 121 of the second end of the other. This method can also realize the aforementioned technical concept, but there will be the disadvantage that the left and right sides of the outer teeth 12 are not symmetrical. Therefore, a more ideal implementation method is that the outer teeth 12 can be arranged at an angle and at the same time, the avoidance gap 121 can be constructed at the second end, which can achieve the overlap in the first direction while ensuring the structural symmetry of the outer teeth 12 to the greatest extent, thereby ensuring the performance of the motor. It can be understood that the aforementioned inclined setting and the design of the avoidance gap 121 can avoid the interference of the outer teeth 12 at the tooth top, thereby reducing the slot width after the core is rounded, and achieving the effect of improving the performance of the motor.

[0035] In some embodiments, the inner side wall of the tooth shoe of the outer tooth portion 12 is projected as a first straight line on the radial plane formed after the stator punching is rounded, and the straight line perpendicular to the first straight line and the tooth center line of the outer tooth portion 2 is a second straight line. The angle formed between the first straight line and the second straight line is a, 0°<a≤5°, so that the problem of excessive difference in the slot area on both sides of the outer tooth portion 12, which leads to excessive difference in the slot full rate of the slot winding on both sides, can be avoided; a better implementation scheme is that, in the circular arrangement state, an inner tooth slot 15 is formed between two adjacent inner tooth portions 11, and the difference between the slot area of ​​the outer tooth slot 14 and the slot area of ​​the inner tooth slot 15 is △V, △V≤(L5 / 2) 2 *tan5°, where L5 is the maximum length of the outer tooth portion 12, so as to ensure that the difference in slot filling rate between the two side slot windings is not too large. It should be noted that the outer circumferential surface of the outer tooth portion 12 is kept concentric with the inner circumferential surface of the inner tooth portion 11.

[0036] In some embodiments, in a linear arrangement state, the opposite sides of two adjacent yokes 16 have a first concave-convex positioning structure, in a linear arrangement state, the first concave-convex positioning structures are disengaged from each other, in a circular arrangement state, the first concave-convex positioning structures are interlocked with each other, and the first concave-convex positioning structures are arranged to ensure the smooth combination of the stator punching sheets when forming a circle, and the positions of the two adjacent punching sheet units after forming a circle are more accurate, which effectively avoids the dislocation of the stator punching sheets when forming a circle. Specifically, the first concave-convex positioning structure includes a guide bar 161 on one side of the yoke 16 and a guide groove 162 on the other side of the yoke 16, the guide bar 161 matches the guide groove 162, and the radial width of the guide bar 161 is b1, and the width of the yoke 16 in the first direction is hj, b1 = (20% to 30%) * hj, which can ensure the structural strength of the yoke 16. In a preferred embodiment, when the stator punching sheets are in a linear arrangement state, the yoke connecting bridge 13 has a circular rotation hole 131, the center of the circular rotation hole 131 is located at the midpoint of the length of the yoke connecting bridge 13 along the second direction, and the circular rotation hole 131 has an opening facing inward, and the second direction is a direction perpendicular to the first direction, that is, Figure 3 In the left and right directions, the circular rotation hole 131 is provided to make the circular bending position of the yoke connecting bridge 13 more accurate, thereby ensuring the circular accuracy of the stator punching sheet and even the stator core. The width of the yoke connecting bridge 13 in the first direction is h1, h1 = (12% to 16%) hj; and / or the guide bar 161 is arc-shaped, and the center of the arc is concentric with the center of the circular rotation hole 131, thereby ensuring the smooth progress of the circular process.

[0037] In some embodiments, in a linear arrangement state, one of the yokes 16 of the two punching units 1 at both ends of the length of the stator punching sheet has a protrusion 163 and the other has a groove 164. In a circular arrangement state, the protrusion 163 is embedded in the groove 164. The protrusion 163 (specifically, it can be a circular arc protrusion) and the groove 164 (specifically, it can be a circular arc groove) are tightly combined to increase the bonding strength, which can effectively avoid the phenomenon of cracking of the straight stator core after rounding, ensure the rounding accuracy of the stator core, and ensure the connection positioning accuracy in the radial direction. In the rounded state, the protrusion 163 has a radial width b2, b2 = (20% ~ 40%) * hj / tan (180 ° / Z1), where hj is the width of the yoke 16 in the first direction, and Z1 is the number of punching units 1 in the stator punching sheet, ensuring that the structural strength of the protrusion 163 and the groove 164 is sufficient.

[0038] In some embodiments, in the circular arrangement state, a fitting seam is formed between the yokes 16 of the two punching units 1 at both ends of the length of the stator punching, and the fitting gap includes a circular arc seam section formed between the protrusion 163 and the groove 164, a first seam section on the outside of the circular arc seam section, and a second seam section on the inside of the circular arc seam section. The first seam section and the second seam section both extend along the radial direction of the stator punching after the circle is formed and have an offset spacing ( Figure 7 c), that is, the inner and outer seam sections do not overlap and are not collinear in the radial direction. This method can further reduce the possibility of cracking at the seam. In some embodiments, the outer opening of the first seam section has welding corners 165 on both sides, and the punching units 1 at both ends are reliably connected through the two welding corners 165, which makes welding more convenient. The protruding height of the welding corner 165 is h2, 0.2mm≤h2≤0.5mm.

[0039] The punching unit 1 is also constructed with multiple buckling points 17, for example, three buckling points are arranged at intervals in the radial direction. The stator punchings are stacked to form a stator core through these buckling points. As a specific embodiment, the three buckling points are distributed on the outer tooth portion 12, the yoke portion 16 and the inner tooth portion 11.

[0040] In one winding method, the inner tooth portion 11 and the outer tooth portion 12 need to be wound with the same number of turns, and the slot area of ​​the inner tooth portion 11 and the outer tooth portion 12 must be basically the same to avoid the phenomenon that the slot full rate on one side is too high and the slot full rate on the other side is too low. Because the radius of the inner tooth portion is smaller and the radius of the outer tooth portion is larger, the slot shape of the outer tooth portion is wider and the slot shape of the inner tooth portion is narrower. To ensure that the slot areas of the inner and outer teeth are basically the same, the inner tooth portion 11 must be designed to be longer than the outer tooth portion 12. Specifically, in the circular arrangement state, the inner circle radius of the inner tooth portion 11 is r, the outer circle radius of the outer tooth portion 12 is R, the radial length of the outer tooth portion 12 is L1, the radial length of the inner tooth portion 11 is L2, and R 2 -(R-L1) 2 =(r+L2) 2 -r 2 .

[0041] See also Figure 4 As shown, according to the geometric relationship, a coordinate system is established with the center of the circle of the stator core after it is circled as the coordinate origin, the center line of the tooth portion of a punching unit 1 in the first direction as the y-axis, and the second direction as the x-axis. The coordinates of the center of the circular rotating hole 131 can be expressed as x=(R-L1-h1)*tan(180° / Z1), y=R-L1-h1.

[0042] According to an embodiment of the present invention, there is also provided a motor stator, comprising the above-mentioned stator punching sheet.

[0043] According to an embodiment of the present invention, there is further provided a motor, comprising the above-mentioned motor stator.

[0044] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A stator punching sheet, It is characterized in that The invention comprises a plurality of punching sheet units (1), each of the punching sheet units (1) comprising an inner tooth portion (11), an outer tooth portion (12) and a yoke portion (16) connected between the inner tooth portion (11) and the outer tooth portion (12), the yoke portions (16) respectively provided by two adjacent punching sheet units (1) being connected as a whole via a yoke portion connecting bridge (13), the stator punching sheet having a linear arrangement state and a circular arrangement state, when the stator punching sheet is in the linear arrangement state, there is an overlapping portion between the two adjacent outer tooth portions (12) in a first direction, when the stator punching sheet is in the circular arrangement state, an outer notch of an outer tooth groove (14) is formed between the two adjacent outer tooth portions (12), and the first direction is the direction in which the outer notch of the outer tooth groove (14) is formed between the two adjacent outer tooth portions (12) in the linear arrangement state. In the linear arrangement state, the direction from the outer tooth portion (12) to the inner tooth portion (11); the side where the outer tooth portion (12) is located is defined as the outer side, and the side where the inner tooth portion (11) is located is defined as the inner side, and the outer tooth portion (12) is arranged obliquely, so that in the linear arrangement state, the first end of the outer tooth portion (12) is located on the outer side of the second end of the outer tooth portion (12) adjacent thereto, and the second end of the outer tooth portion (12) is located on the inner side of the first end of the outer tooth portion (12) adjacent thereto; in the circular arrangement state, the radial thickness of the first end is smaller than the radial thickness of the second end, and the outer side of the second end is configured with an avoidance notch (121) to enable the first end and the second end to overlap in the first direction.

2. The stator sheet according to claim 1, It is characterized in that The inner side wall of the tooth shoe of the outer tooth portion (12) is projected onto a radial plane formed after the stator punching sheet is rounded to form a first straight line, a straight line perpendicular to the first straight line and the tooth center line of the outer tooth portion (2) is a second straight line, and an angle formed between the first straight line and the second straight line is a, 0°<a≤5°.

3. The stator sheet according to claim 2, It is characterized in that In the circular arrangement state, an internal tooth groove (15) is formed between two adjacent internal tooth portions (11), and the difference between the groove area of ​​the external tooth groove (14) and the groove area of ​​the internal tooth groove (15) is △V, △V≤(L5 / 2)²*tan5°, wherein L5 is the maximum length of the external tooth portion (12).

4. The stator sheet according to claim 1, It is characterized in that In the linear arrangement state, opposite sides of two adjacent yokes (16) have first concave-convex positioning structures, in the linear arrangement state, the first concave-convex positioning structures are disengaged from each other, and in the circular arrangement state, the first concave-convex positioning structures are engaged with each other.

5. The stator sheet according to claim 4, It is characterized in that The first concave-convex positioning structure comprises a guide bar (161) on the yoke (16) on one side and a guide groove (162) on the yoke (16) on the other side, the guide bar (161) matches the guide groove (162), and the radial width of the guide bar (161) is b1, the width of the yoke (16) in the first direction is hj, and b1=(20%~30%)*hj.

6. The stator sheet according to claim 5, It is characterized in that When the stator punching sheets are in the linear arrangement state, the yoke connecting bridge (13) has a circular rotation hole (131), the center of the circular rotation hole (131) is located at the midpoint of the length of the yoke connecting bridge (13) along a second direction, and the circular rotation hole (131) has an opening facing the inner side, and the second direction is a direction perpendicular to the first direction.

7. The stator sheet according to claim 6, It is characterized in that The width of the yoke connecting bridge (13) in the first direction is h1, h1=(12%-16%)hj; and / or the guide bar (161) is arc-shaped, and the center of the arc is concentric with the center of the circular rotating hole (131).

8. The stator sheet according to claim 1, It is characterized in that In the linear arrangement state, on the yoke (16) of the two punching units (1) at the two ends of the length of the stator punching sheet, one has a protrusion (163) and the other has a groove (164), and in the circular arrangement state, the protrusion (163) is embedded in the groove (164).

9. The stator lamination according to claim 8, It is characterized in that In the rounded state, the protrusion (163) has a radial width b2, b2=(20%~40%)*hj / tan(180° / Z1), where hj is the width of the yoke (16) in the first direction, and Z1 is the number of the punching units (1) in the stator punching.

10. The stator sheet according to claim 8, It is characterized in that In the circular arrangement state, a fitting seam is formed between the yokes (16) respectively provided on the two punching units (1) at both ends of the length of the stator punching sheet, the fitting seam comprising a circular arc seam section formed between the protrusion (163) and the groove (164), a first seam section located outside the circular arc seam section, and a second seam section located inside the circular arc seam section, the first seam section and the second seam section both extending in the radial direction of the circular stator punching sheet and having an offset spacing in the circumferential direction of the circular stator punching sheet.

11. The stator sheet according to claim 10, It is characterized in that Both sides of the outer opening of the first seam section are provided with welding sharp corners (165).

12. The stator sheet according to claim 11, It is characterized in that The protruding height of the welding sharp corner (165) is h2, and 0.2 mm ≤ h2 ≤ 0.5 mm.

13. The stator lamination according to any one of claims 1 to 12, It is characterized in that In the circular arrangement state, the inner circle radius corresponding to the inner tooth portion (11) is r, the outer circle radius of the outer tooth portion (12) is R, the radial length of the outer tooth portion (12) is L1, and the radial length of the inner tooth portion (11) is L2, R²-(R-L1)²= (r+L2)²-r².

14. A motor stator, It is characterized in that The stator sheet comprises the stator sheet according to any one of claims 1 to 13.

15. A motor, It is characterized in that The motor stator comprises the motor stator as claimed in claim 14.

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