Stator punching sheet and stator, motor and electrical equipment having the same

Abstract

The present invention discloses a stator punching, and a stator, motor, and electrical equipment having the same. The stator punching comprises: a stator yoke; and N stator teeth, each stator tooth comprising a tooth body, first and second pole shoes, the projections of the central axis of the stator yoke and the centerline of the tooth body on a first plane being a first point and a first straight line, respectively, the projections of the first pole shoe and the second pole shoe on the first plane having first and second peripheral edges and third and fourth peripheral edges, respectively, the second peripheral edge being located between the first peripheral edge and the stator yoke, and the fourth peripheral edge being located between the third peripheral edge and the stator yoke, the angle between the line connecting the endpoint of the first peripheral edge and the first point and the first straight line being α, the angle between the line connecting the endpoint of the third peripheral edge and the first point and the first straight line being β, 0°<α<180° / N, 180° / N<β<360° / N. The stator punching has advantages such as low cogging effect, effectively reducing the cogging torque, torque pulsation, and vibration noise of the motor.

Description

Technical Field

[0001] The present invention relates to the field of motors, in particular to stator punching sheets, and also to a stator, a motor and electrical equipment having the stator punching sheets. Background Art

[0002] Single-phase brushless DC motors in the related art have only one winding phase, resulting in a dead point and poor starting performance. To address this issue, a gradient air gap or an asymmetric tooth structure is employed to offset the stator and rotor pole centers, thus avoiding the starting dead point. However, this increases the cogging effect, cogging torque, and torque ripple, leading to significant vibration and noise. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention provides a stator punching sheet and a stator, a motor and an electrical equipment having the stator punching sheet.

[0004] According to an embodiment of the present invention, a stator punching sheet includes a stator yoke portion; and N stator teeth portions, wherein the N stator teeth portions are spaced apart along the circumference of the stator yoke portion, and a punching sheet slot is formed between two adjacent stator teeth portions, each stator tooth portion includes a tooth body, a first pole shoe and a second pole shoe, the tooth body is connected to the stator yoke portion, the projection of the central axis of the stator yoke portion on the first plane is a first point, the projection of the center line of the tooth body on the first plane is a first straight line, the projection of the first pole shoe on the first plane has a first peripheral edge and a second peripheral edge extending along the circumference of the stator yoke portion, and the projection of the second pole shoe on the first plane has a The third circumference and the fourth circumference, the second circumference is located between the first circumference and the stator yoke in the radial direction of the stator yoke, the fourth circumference is located between the third circumference and the stator yoke in the radial direction of the stator yoke, the line connecting the end point of the first circumference away from the tooth body and the first point is a first line, and the line connecting the end point of the third circumference away from the tooth body and the first point is a second line, wherein the angle between the first line and the first straight line is α, and the angle between the second line and the first straight line is β, 0°<α<180° / N, 180° / N<β<360° / N, and the first plane is perpendicular to the central axis of the stator yoke.

[0005] The stator punching according to the embodiment of the present invention has the advantage of small cogging effect. By utilizing the stator punching according to the embodiment of the present invention, not only the starting performance of the motor can be improved, but also the cogging torque and torque pulsation of the motor can be effectively reduced, thereby effectively reducing the vibration noise of the motor.

[0006] Optionally, the stator punching sheet includes a plurality of punching sheet slots, and the slot openings of the plurality of punching sheet slots have the same dimensions as each other in the circumferential direction of the stator yoke.

[0007] Optionally, 0°<360° / Ν-α-β≤5°.

[0008] Optionally, the ratio of β to α is greater than or equal to 1.3 and less than or equal to 4.

[0009] The stator according to the embodiment of the present invention includes a plurality of stator punching sheets, and each of the stator punching sheets is a stator punching sheet according to the embodiment of the present invention.

[0010] The stator according to the embodiment of the present invention has the advantage of a small cogging effect. By utilizing the stator according to the embodiment of the present invention, not only the starting performance of the motor can be improved, but also the cogging torque and torque pulsation of the motor can be effectively reduced, thereby effectively reducing the vibration noise of the motor.

[0011] Optionally, the stator includes a plurality of stator slots, and a size of each stator slot in the circumferential direction of the stator remains unchanged along the axial direction of the stator.

[0012] Optionally, the length of the first pole shoe of the multiple stator punchings increases along the axial direction of the stator, and the length of the second pole shoe of the multiple stator punchings in the circumferential direction of the stator decreases along the axial direction of the stator; or, the length of the first pole shoe of the multiple stator punchings decreases along the axial direction of the stator, and the length of the second pole shoe of the multiple stator punchings increases along the axial direction of the stator.

[0013] Optionally, the stator includes a plurality of stator slots, and a size of each stator slot in the circumferential direction of the stator increases or decreases along the axial direction of the stator.

[0014] Optionally, a size of each stator slot in the circumferential direction of the stator gradually increases or decreases along the axial direction of the stator.

[0015] Optionally, the length of the first pole shoe of the plurality of stator punchings decreases along the axial direction of the stator, and the length of the second pole shoe of the plurality of stator punchings decreases along the axial direction of the stator; or, the length of the first pole shoe of the plurality of stator punchings increases along the axial direction of the stator, and the length of the second pole shoe of the plurality of stator punchings increases along the axial direction of the stator.

[0016] A motor according to an embodiment of the present invention includes: a rotor; and a stator, wherein the stator is the stator according to an embodiment of the present invention.

[0017] The motor according to the embodiment of the present invention has the advantages of good starting performance, small cogging torque, small torque pulsation, and low vibration and noise.

[0018] The electric equipment according to the embodiment of the present invention includes the motor according to the embodiment of the present invention.

[0019] The electrical equipment according to the embodiment of the present invention has the advantage of low vibration and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a stator punching sheet according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a partial structure of a stator according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of a partial structure of a stator according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a partial structure of a stator according to an embodiment of the present invention;

[0024] Figure 5 3 is a schematic diagram of the partial structure of a stator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] The following describes a stator sheet 10 according to an embodiment of the present invention with reference to the accompanying drawings. Figure 1-Figure 5 As shown, a stator punching 10 according to an embodiment of the present invention includes a stator yoke 110 and N stator teeth 120. The N stator teeth 120 are spaced apart along the circumference of the stator yoke 110, with punching slots 130 formed between adjacent stator teeth 120. Each stator tooth 120 includes a tooth body 121, a first pole shoe 122, and a second pole shoe 123. The tooth body 121 is connected to the stator yoke 110. The projection of the central axis of the stator yoke 110 onto a first plane is a first point O, and the projection of the centerline of the tooth body 121 onto the first plane is a first straight line L1.

[0027] The projection of the first pole shoe 122 on the first plane includes a first circumferential edge 1221 and a second circumferential edge 1222 extending in the circumferential direction of the stator yoke 110. The second circumferential edge 1222 is located between the first circumferential edge 1221 and the stator yoke 110 in the radial direction of the stator yoke 110. The projection of the second pole shoe 123 on the first plane includes a third circumferential edge 1231 and a fourth circumferential edge 1232 extending in the circumferential direction of the stator yoke 110. The fourth circumferential edge 1232 is located between the third circumferential edge 1231 and the stator yoke 110 in the radial direction of the stator yoke 110.

[0028] A line connecting the endpoint P1 of the first peripheral edge 1221, which is distal to the tooth body 121, and the first point O is a first line L2, and a line connecting the endpoint P2 of the third peripheral edge 1231, which is distal to the tooth body 121, and the first point O is a second line L3. In other words, the endpoint P1 of the first peripheral edge 1221 is distal to the tooth body 121 in the circumferential direction of the stator yoke 110, and the endpoint P2 of the third peripheral edge 1231 is distal to the tooth body 121 in the circumferential direction of the stator yoke 110.

[0029] Among them, the angle between the first connecting line L2 and the first straight line L1 is α, the angle between the second connecting line L3 and the first straight line L1 is β, 0°<α<180° / N, 180° / N<β<360° / N, and the first plane is perpendicular to the central axis of the stator yoke 110.

[0030] The stator lamination 10 according to the embodiment of the present invention makes the first pole shoe 122 and the second pole shoe 123 of the stator tooth 120 asymmetrical relative to the tooth body 121 by setting 0°<α<180° / N and 180° / N<β<360° / N. This allows the stator magnetic field and the rotor magnetic field to have a greater degree of offset, thereby enabling the motor having the stator lamination 10 to have a greater starting torque and better starting performance.

[0031] The asymmetric tooth design in the related art is achieved by reducing the length of one of the first and second pole shoes. In other words, the length of one of the first and second pole shoes is less than the length of the pole shoe in a symmetrical tooth design (i.e., the unreduced pole shoe), and the length of the other of the first and second pole shoes is equal to the length of the pole shoe in a symmetrical tooth design. As a result, compared to stator sheets with symmetrical tooth designs, the slots of the stator sheets with asymmetric tooth designs in the related art are larger, which leads to an increase in the cogging effect, thereby increasing the cogging torque and torque ripple of the motor, and thus increasing the vibration and noise of the motor.

[0032] According to the stator punching sheet 10 of the embodiment of the present invention, by making 0°<α<180° / N, 180° / N<β<360° / N, the length of the first pole shoe 122 can be smaller than the length of the pole shoe of the stator punching sheet with a symmetrical tooth design, and the length of the second pole shoe 123 can be greater than the length of the pole shoe of the stator punching sheet with a symmetrical tooth design.

[0033] As a result, the width of the slot opening 131 of the sheet slot 130 of the stator sheet 10 can be made less than or equal to the width of the slot opening of the stator sheet with a symmetrical tooth design, and the width of the slot opening 131 of the sheet slot 130 of the stator sheet 10 can be made less than the width of the slot opening of the stator sheet with an asymmetrical tooth design. This can effectively reduce the cogging effect, thereby effectively reducing the cogging torque and torque ripple of the motor, thereby reducing the vibration and noise of the motor. The width of the slot opening 131 refers to the size of the slot opening 131 in the circumferential direction of the stator yoke 110.

[0034] Therefore, the stator punching sheet 10 according to the embodiment of the present invention has the advantages of small cogging effect, etc. By utilizing the stator punching sheet 10 according to the embodiment of the present invention, not only the starting performance of the motor can be improved, but also the cogging torque and torque pulsation of the motor can be effectively reduced, thereby effectively reducing the vibration noise and equivalent air gap of the motor.

[0035] The present invention also provides a stator 1. The stator 1 according to an embodiment of the present invention includes a plurality of stator laminations 10 according to the above-described embodiment of the present invention. Therefore, the stator 1 according to the embodiment of the present invention has advantages such as reduced cogging. By utilizing the stator 1 according to the embodiment of the present invention, not only can the starting performance of the motor be improved, but the cogging torque and torque ripple of the motor can also be effectively reduced, thereby effectively reducing the vibration and noise of the motor.

[0036] The plurality of stator laminations 10 of the stator 1 can be assembled in a known manner to form a stator core. For example, the plurality of stator laminations 10 can be stacked together. Since this is not relevant to the invention of the present application, it will not be described in detail.

[0037] like Figure 1-Figure 5 As shown, the stator 1 includes a plurality of stator laminations 10 , each of the stator laminations 10 includes a stator yoke 110 and a plurality of stator teeth 120 , and each of the stator teeth 120 includes a tooth body 121 , a first pole shoe 122 and a second pole shoe 123 .

[0038] The first pole shoe 122 and the second pole shoe 123 can be connected to the tooth body 121 in a known manner. For example, the end of the first pole shoe 122 is connected to the end of the tooth body 121, and the end of the second pole shoe 123 is connected to the end of the tooth body 121. The first pole shoe 122 extends from the tooth body 121 in a clockwise direction, and the second pole shoe 123 extends from the tooth body 121 in a counterclockwise direction.

[0039] The tooth body 121 is connected to the stator yoke 110. Multiple stator teeth 120 are spaced apart along the circumference of the stator yoke 110, and multiple tooth bodies 121 are spaced apart along the circumference of the stator yoke 110. The circumference of the stator yoke 110 coincides with the circumference of the stator 1. Optionally, the tooth body 121 is detachably connected to the stator yoke 110. This allows the stator yoke 110 and stator teeth 120 to be machined separately, facilitating winding and improving the motor slot fill rate.

[0040] A punching slot 130 is formed between two adjacent stator teeth 120. Specifically, the punching slot 130 is defined by the stator yoke 110, the tooth body 121 and first pole shoe 122 of one stator tooth 120, and the tooth body 121 and second pole shoe 123 of another stator tooth 120.

[0041] The projection of the central axis of the stator yoke 110 on the first plane is the first point O, and the projection of the center line of the tooth body 121 on the first plane is the first straight line L1. The first plane is perpendicular to the central axis of the stator yoke 110.

[0042] The projection of the first pole shoe 122 on the first plane includes a first circumferential edge 1221 and a second circumferential edge 1222 extending in the circumferential direction of the stator yoke 110. The second circumferential edge 1222 is located between the first circumferential edge 1221 and the stator yoke 110 in the radial direction of the stator yoke 110. The projection of the second pole shoe 123 on the first plane includes a third circumferential edge 1231 and a fourth circumferential edge 1232 extending in the circumferential direction of the stator yoke 110. The fourth circumferential edge 1232 is located between the third circumferential edge 1231 and the stator yoke 110 in the radial direction of the stator yoke 110.

[0043] The line connecting the endpoint P1 of the first circumferential edge 1221, which is distal to the tooth body 121, and the first point O is the first line L2, and the line connecting the endpoint P2 of the third circumferential edge 1231, which is distal to the tooth body 121, and the first point O is the second line L3. In other words, the endpoint P1 of the first circumferential edge 1221 is distal to the tooth body 121 in the circumferential direction of the stator yoke 110, and the endpoint P2 of the third circumferential edge 1231 is distal to the tooth body 121 in the circumferential direction of the stator yoke 110. The angle between the first line L2 and the first straight line L1 is α, and the angle between the second line L3 and the first straight line L1 is β, where 0°<α<180° / N, and 180° / N<β<360° / N.

[0044] Optionally, the length of the first pole shoe 122 is less than a preset value, and the length of the second pole shoe 123 is greater than the preset value. The length of the first pole shoe 122 refers to the circumferential dimension of the first pole shoe 122 in the stator yoke 110; the length of the second pole shoe 123 refers to the circumferential dimension of the second pole shoe 123 in the stator yoke 110.

[0045] Optionally, the ratio of β to α is greater than or equal to 1.3 and less than or equal to 4. This not only makes the stator sheet 10 and the stator 1 have smaller cogging, but also further improves the starting performance of the motor and further reduces the cogging torque, torque ripple and vibration noise of the motor.

[0046] like Figure 1 As shown, the stator sheet 10 includes a plurality of sheet slots 130, and the slot openings 131 of the plurality of sheet slots 130 are equal in size to each other in the circumferential direction of the stator yoke 110. In other words, the widths of the plurality of sheet slots 130 are equal to each other.

[0047] Optionally, 0°<360° / N-α-β≤5°. That is, the central angle γ corresponding to the lamination slot 130 is greater than 0° and less than or equal to 5 degrees, i.e., the central angle γ = 360° / N-α-β. This not only reduces the cogging effect of the stator lamination 10 and the stator 1, but also further improves the starting performance of the motor and further reduces the cogging torque, torque ripple, and vibration noise of the motor.

[0048] After the plurality of stator punching sheets 10 are assembled together, the punching slots 130 of the plurality of stator punching sheets 10 constitute the stator slots 20 of the stator 1. Accordingly, the stator 1 includes a plurality of stator slots 20.

[0049] like Figure 2 and Figure 3 As shown, the size of each stator slot 20 in the circumferential direction of the stator 1 remains unchanged along the axial direction of the stator 1 , that is, the width of each stator slot 20 remains unchanged along the axial direction of the stator 1 .

[0050] like Figure 2 and Figure 3 As shown, the length of the first pole shoe 122 of the plurality of stator sheets 10 increases along the axial direction of the stator 1, and the length of the second pole shoe 123 of the plurality of stator sheets 10 decreases along the axial direction of the stator 1, so that the width of each stator slot 20 remains unchanged along the axial direction of the stator 1. Since the circumferential direction of the stator yoke 110 is consistent with the circumferential direction of the stator 1, the length of the first pole shoe 122 is also the circumferential dimension of the first pole shoe 122 in the stator 1, and the length of the second pole shoe 123 is also the circumferential dimension of the second pole shoe 123 in the stator 1.

[0051] As a result, the length of the first pole shoe 122 changes along the axial direction of the stator 1 , thereby further increasing the degree of deviation between the stator magnetic field and the rotor magnetic field, so as to further increase the starting torque of the motor.

[0052] In addition, the length of the first pole shoe 122 of the plurality of stator sheets 10 decreases along the axial direction of the stator 1, and the length of the second pole shoe 123 of the plurality of stator sheets 10 increases along the axial direction of the stator 1. Thus, the length of the first pole shoe 122 varies along the axial direction of the stator 1, thereby further increasing the degree of offset between the stator magnetic field and the rotor magnetic field, thereby further increasing the starting torque of the motor.

[0053] like Figure 4 and Figure 5 As shown, the size of each stator slot 20 in the circumferential direction of the stator 1 increases or decreases along the axial direction of the stator 1, that is, the width of each stator slot 20 increases or decreases along the axial direction of the stator 1. As a result, the width of the stator slot 20 varies along the axial direction of the stator 1, that is, the stator 1 has stator slots 20 of unequal widths, thereby further reducing the cogging torque and torque ripple of the motor, thereby further reducing the vibration noise of the motor.

[0054] Optionally, the circumferential dimension of each stator slot 20 of the stator 1 gradually increases or decreases along the axial direction of the stator 1, that is, the width of each stator slot 20 gradually increases or decreases along the axial direction of the stator 1. Thus, the width of the stator slot 20 gradually changes along the axial direction of the stator 1, that is, the stator 1 has stator slots 20 of unequal widths, thereby further reducing the cogging torque and torque ripple of the motor, thereby further reducing the vibration noise of the motor.

[0055] like Figure 4 and Figure 5 As shown, the length of the first pole piece 122 of the plurality of stator sheets 10 decreases (gradually decreases) along the axial direction of the stator 1, and the length of the second pole piece 123 of the plurality of stator sheets 10 decreases (gradually decreases) along the axial direction of the stator 1. This can further reduce the cogging torque and torque ripple of the motor, thereby further reducing the vibration noise of the motor.

[0056] Furthermore, the lengths of the first pole pieces 122 of the plurality of stator sheets 10 increase (gradually increase) along the axial direction of the stator 1, and the lengths of the second pole pieces 123 of the plurality of stator sheets 10 increase (gradually increase) along the axial direction of the stator 1. This can further reduce the cogging torque and torque ripple of the motor, thereby further reducing the vibration noise of the motor.

[0057] The present invention also provides a motor. The motor according to an embodiment of the present invention includes a rotor and a stator 1 according to the above-described embodiment of the present invention. Therefore, the motor according to the embodiment of the present invention has advantages such as good starting performance, low cogging torque, low torque ripple, and low vibration and noise.

[0058] The rotor may be known, and the rotor and stator 1 may be matched in a known manner. Since these are not relevant to the invention of this application, they will not be described in detail. The motor according to the embodiment of the present invention may be an outer rotor motor or an inner rotor motor.

[0059] Optionally, the rotor has multiple permanent magnets, which are spaced apart along the circumference of the rotor. The circumference of the rotor coincides with the circumference of the stator 1. The thickness of the multiple permanent magnets gradually decreases or increases along the direction of rotation of the rotor. This can cause the centerline of the stator magnetic field to be offset from the centerline of the rotor magnetic field, thereby facilitating motor starting.

[0060] Optionally, the air gap between the pole shoes of the stator 1 and the rotor gradually decreases or increases along the rotation direction of the rotor, thereby causing the center line of the stator magnetic field to be offset from the center line of the rotor magnetic field, thereby facilitating motor starting.

[0061] Moreover, since the stator punching sheets 10 and the stator 1 can reduce the equivalent air gap of the motor, the adverse effects of the gradual air gap can be offset, thereby avoiding a decrease in the output torque of the motor.

[0062] The present invention also provides electrical equipment. The electrical equipment according to an embodiment of the present invention includes the motor according to the above-mentioned embodiment of the present invention. Therefore, the electrical equipment according to the embodiment of the present invention has advantages such as low vibration and noise.

[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0065] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0066] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A stator punching sheet, characterized in that: include: stator yoke; and N stator teeth, the N stator teeth are spaced apart along the circumference of the stator yoke, and a punching slot is formed between two adjacent stator teeth, each stator tooth includes a tooth body, a first pole shoe and a second pole shoe, the tooth body is connected to the stator yoke, the projection of the central axis of the stator yoke on the first plane is a first point, the projection of the center line of the tooth body on the first plane is a first straight line, the projection of the first pole shoe on the first plane has a first circumferential edge and a second circumferential edge extending along the circumference of the stator yoke, the projection of the second pole shoe on the first plane has a third circumferential edge and a fourth circumferential edge extending along the circumference of the stator yoke, The second circumference is located between the first circumference and the stator yoke in the radial direction of the stator yoke, the fourth circumference is located between the third circumference and the stator yoke in the radial direction of the stator yoke, a line connecting the endpoint of the first circumference away from the tooth body and the first point is a first line, and a line connecting the endpoint of the third circumference away from the tooth body and the first point is a second line, wherein the angle between the first line and the first straight line is α, the angle between the second line and the first straight line is β, 0°<α<180° / N, 180° / N<β<360° / N, and the first plane is perpendicular to the central axis of the stator yoke; The stator punching sheet includes a plurality of punching sheet slots, and the slot openings of the plurality of punching sheet slots have the same size in the circumferential direction of the stator yoke; 0°<360° / Ν-α-β≤5°.

2. The stator sheet according to claim 1, characterized in that: The ratio of β to α is greater than or equal to 1.3 and less than or equal to 4.

3. A stator, characterized in that: It comprises a plurality of stator punching sheets, each of which is a stator punching sheet according to any one of claims 1 to 2.

4. The stator according to claim 3, characterized in that The stator includes a plurality of stator slots, and a size of each of the stator slots in a circumferential direction of the stator remains constant along an axial direction of the stator.

5. The stator according to claim 4, characterized in that The lengths of the first pole shoes of the plurality of stator punching sheets increase along the axial direction of the stator, and the lengths of the second pole shoes of the plurality of stator punching sheets in the circumferential direction of the stator decrease along the axial direction of the stator. Alternatively, the lengths of the first pole shoes of the plurality of stator punching sheets decrease along the axial direction of the stator, and the lengths of the second pole shoes of the plurality of stator punching sheets increase along the axial direction of the stator.

6. The stator according to claim 3, characterized in that The stator includes a plurality of stator slots, and a size of each of the stator slots in a circumferential direction of the stator increases or decreases along an axial direction of the stator.

7. The stator according to claim 6, characterized in that A size of each stator slot in the circumferential direction of the stator gradually increases or decreases along the axial direction of the stator.

8. The stator according to claim 6 or 7, characterized in that: The lengths of the first pole shoes of the plurality of stator punching sheets decrease along the axial direction of the stator, and the lengths of the second pole shoes of the plurality of stator punching sheets decrease along the axial direction of the stator. Alternatively, the lengths of the first pole shoes of the plurality of stator punching sheets increase along the axial direction of the stator, and the lengths of the second pole shoes of the plurality of stator punching sheets increase along the axial direction of the stator.

9. A motor, characterized in that: include: rotor; and The stator is the stator according to any one of claims 3 to 8.

10. An electrical equipment, characterized in that: comprising the motor according to claim 9.

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