Motor punching sheet structure

Abstract

The invention relates to the technical field of motor devices, and particularly discloses a motor punching sheet structure which comprises a rotor punching sheet, a plurality of magnetic steel grooves are distributed on the rotor punching sheet in an annular array mode, each magnetic steel groove is in a V shape, and two first magnetic isolation grooves are formed in an opening of each V-shaped magnetic steel groove. The two first magnetic isolation grooves are symmetrically arranged about the center line of the V-shaped magnetic steel groove and are in a splayed shape, the end, close to the periphery of the rotor punching sheet, of each first magnetic isolation groove is the outer end, the end, away from the periphery of the rotor punching sheet, of each first magnetic isolation groove is the inner end, and the inner end and the outer end are located at the two ends of the first magnetic isolation groove in the length direction respectively. The distance between the outer ends of the two first magnetic isolation grooves is smaller than the distance between the inner ends of the two first magnetic isolation grooves, and the two first magnetic isolation grooves are reasonably arranged, so that the magnetic flux trend is combed, the interaction space of a stator magnetic field and a rotor magnetic field is separated, the waveform of power generation voltage is influenced, q-axis inductance is reduced, main harmonic waves are reduced, and the stability of the motor during operation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric motor devices, and in particular to a motor punching sheet structure. Background Art

[0002] In today's society where global resources are scarce, people are increasingly aware of energy conservation, emission reduction and low-carbon living. At present, the country is also vigorously advocating energy conservation and emission reduction, and improving the energy efficiency of motors is one of the main ways to achieve this goal. At present, motors widely used in industries such as industry, agriculture, commerce, construction and transportation generally have defects such as low efficiency and high energy consumption, and cannot meet the requirements of high efficiency and energy conservation and emission reduction.

[0003] Punching laminations are key components in motors. Their materials, inner circle dimensions, outer circle dimensions, slot size, number, etc. have a direct impact on motor performance. As people's requirements for motor performance become higher and higher, punching laminations need to have continuously optimized performance in terms of vibration noise and harmonic loss. Summary of the invention

[0004] The purpose of the present invention is to provide a motor punching structure, which can reasonably set magnetic isolation grooves to sort out the direction of magnetic flux, separate the interaction space of the stator and rotor magnetic fields, affect the waveform of the generated voltage, reduce the q-axis inductance, reduce the main harmonics, and improve the stability of the motor during operation.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a motor punching structure, comprising a rotor punching and a stator punching sleeved on the outer periphery of the rotor punching, wherein the stator punching and the rotor punching are arranged at intervals, and a plurality of magnetic steel slots are arranged in an annular array on the rotor punching, and the plurality of magnetic steel slots are used to place magnetic steel, wherein:

[0007] Each of the magnetic steel grooves is V-shaped, and the opening of the V-shape faces the outer periphery of the rotor punching. Two first magnetic isolation grooves are arranged in the opening of each of the V-shaped magnetic steel grooves. The two first magnetic isolation grooves are symmetrically arranged about the center line of the V-shaped magnetic steel groove and are in an eight-shape. The end of each of the first magnetic isolation grooves close to the outer periphery of the rotor punching is the outer end, and the end of each of the first magnetic isolation grooves away from the outer periphery of the rotor punching is the inner end. The inner end and the outer end are respectively located at the two ends of the length direction of the first magnetic isolation groove, and the distance between the outer ends of the two first magnetic isolation grooves is smaller than the distance between the inner ends of the two first magnetic isolation grooves.

[0008] In which, a plurality of stator teeth and a plurality of stator slots are alternately arranged on the outer circumference of the stator punching sheet, the inner end and the outer end of the first magnetic isolation slot are both arc-shaped, the distance between the centers of the two outer ends of the first magnetic isolation slots is L, the slot width of the first magnetic isolation slot is d, the tooth width of the stator tooth is Ts, and the value of (Ld) / Ts is between 0.45 and 0.68.

[0009] Wherein, both ends of each of the V-shaped magnetic steel slots are provided with a second magnetic isolation groove, and the second magnetic isolation groove is spaced from the outer periphery of the rotor punching, each of the second magnetic isolation grooves protrudes toward the center line of the V-shaped magnetic steel slot, and the second magnetic isolation groove is arc-shaped, the center line of the V-shaped magnetic steel slot is L1, and the center line of the stator tooth is L2. When one of the L1s coincides with one of the L2s, the V-shaped magnetic steel slot corresponding to L1 is a set V-shaped magnetic steel slot, the stator tooth corresponding to L2 is a set stator tooth, and the two stator slots adjacent to the set stator tooth are both set stator slots, the center line of the set stator slot is L3, two L3s intersect at the center of the rotor punching, and two L3s pass through the center of the two second magnetic isolation grooves on the set V-shaped magnetic steel slot respectively.

[0010] Wherein, two triangular grooves with triangular cross-sections are symmetrically arranged on the outer circumference of the rotor punching corresponding to the center line of each V-shaped magnetic steel groove, and the triangular groove includes a first side and a second side, the first side intersects with the outer circumference of the rotor punching and the intersection point is a first intersection point, the second side intersects with the outer circumference of the rotor punching and the intersection point is a second intersection point, the intersection point between the first side and the second side is a third intersection point, the first intersection point is closer to the center line of the V-shaped magnetic steel groove than the second intersection point, and the second intersection point is closer to the second magnetic isolation groove than the first intersection point;

[0011] The first intersection point, the second intersection point and the third intersection point of the two triangular grooves corresponding to the V-shaped magnetic steel groove are set to be D1, D2 and D3 respectively, and the two D2s coincide with the two L3s respectively; and / or,

[0012] The two D2 are arranged in one-to-one correspondence with the two second magnetic isolation grooves on the set V-shaped magnetic steel groove, and the minimum distance between each D2 and the corresponding second magnetic isolation groove is d1, 0.5mm≤d1≤0.7mm.

[0013] Wherein, the stator tooth includes two side walls spaced apart along the circumferential direction of the stator punching sheet, two first arc surfaces respectively connected to the two side walls, two first inclined surfaces respectively connected to the two first arc surfaces, and two second inclined surfaces respectively connected to the two first inclined surfaces, the arc surfaces, the first inclined surfaces and the second inclined surfaces are successively away from the side walls, the stator tooth also includes a second arc surface parallel to the outer circumference of the rotor punching sheet and spaced apart, and two connecting surfaces connected between the second arc surface and the two second inclined surfaces, chamfers are provided between the two connecting surfaces and the two second arc surfaces, the two end points of each of the chamfers corresponding to the set stator tooth are S1 and S2, respectively, the straight lines passing through S1 and S2 and parallel to the center line of the set stator tooth are C1 and C2, and D3 is located between C1 and C2.

[0014] Therein, an included angle is formed between the first inclined surface and the second inclined surface, and the first inclined surface is farther away from the outer periphery of the rotor punching sheet than the second inclined surface.

[0015] Among them, the intersection points between the two second inclined surfaces of the set stator teeth and the two connecting surfaces are both D4, the distances from the two D4s to the center line of the set stator teeth are both h1, the distances from the two D1s to the center line of the set stator teeth are both h2, h1-h2=δ, and the gap distance between the inner periphery of the stator punching sheet and the outer periphery of the rotor punching sheet is also δ.

[0016] Wherein, the δ is 0.3mm-1mm.

[0017] Among them, the straight line connecting D3 and the center of the rotor punching is L4, the intersection of L4 and the outer periphery of the rotor punching is D5, the distance between D5 and D3 is d2, and 0.25δ≤d2≤0.75δ.

[0018] Wherein, the included angle between the two first magnetic isolation grooves is 60°-70°.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a motor punching structure, which includes a rotor punching and a stator punching sleeved on the outer periphery of the rotor punching, the stator punching and the rotor punching are arranged at intervals, a plurality of magnetic steel grooves are arranged in a circular array on the rotor punching, the plurality of magnetic steel grooves are used to place magnetic steels, each magnetic steel groove is V-shaped, and the opening of the V-shaped magnetic steel groove faces the outer periphery of the rotor punching, two first magnetic isolation grooves are arranged in the opening of each V-shaped magnetic steel groove, the two first magnetic isolation grooves are symmetrically arranged about the center line of the V-shaped magnetic steel groove and are in an eight-shaped shape, and each first magnetic isolation groove is close to the rotor punching. One end of the outer periphery is the outer end, and the end of each first magnetic isolation groove away from the outer periphery of the rotor punching is the inner end. The inner end and the outer end are respectively located at the two ends of the length direction of the first magnetic isolation groove. The distance between the outer ends of the two first magnetic isolation grooves is smaller than the distance between the inner ends of the two first magnetic isolation grooves. By reasonably arranging two first magnetic isolation grooves in the opening of the V-shaped magnetic steel groove, the magnetic flux direction is sorted out, the interaction space of the stator and rotor magnetic fields is separated, the waveform of the generated voltage is affected, the q-axis inductance is reduced, the main harmonics are reduced, the sinusoidal nature of the back electromotive force waveform is improved, and the stability of the motor during operation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of the motor punching sheet provided by the present invention;

[0022] Figure 2 A partial enlargement of the motor punching structure provided by the present invention Figure 1 ;

[0023] Figure 3 A partial enlargement of the motor punching structure provided by the present invention Figure 2 ;

[0024] Figure 4 This is a partial enlarged view of the stator teeth provided by the present invention.

[0025] in:

[0026] 1. rotor punching sheet; 11. magnetic steel slot; 12. first magnetic isolation slot; 13. second magnetic isolation slot; 14. triangular slot;

[0027] 2. stator punching sheet; 21. stator tooth; 211. side wall; 212. first arc surface; 213. first inclined surface; 214. second inclined surface; 215. second arc surface; 216. connecting surface; 217. rounded corner; 22. stator slot. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0030] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0033] like Figures 1 to 4As shown, the present embodiment provides a motor punching structure, which includes a rotor punching 1, and a stator punching 2 sleeved on the outer periphery of the rotor punching 1, the stator punching 2 and the rotor punching 1 are arranged at intervals, and a plurality of magnetic steel slots 11 are arranged in a ring array on the rotor punching 1, and the plurality of magnetic steel slots 11 are used to place magnetic steels, each magnetic steel slot 11 is V-shaped, and the opening of the V-shaped magnetic steel slot faces the outer periphery of the rotor punching 1, and two first magnetic isolation slots 12 are arranged in the opening of each V-shaped magnetic steel slot 11, and the two first magnetic isolation slots 12 are symmetrically arranged about the midline of the V-shaped magnetic steel slot 11 and are in an eight-shaped shape, and each first magnetic isolation slot 12 is symmetrically arranged about the midline of the V-shaped magnetic steel slot 11 and is in an eight-shaped shape. The end of a magnetic isolation groove 12 close to the outer circumference of the rotor punching 1 is the outer end, and the end of each first magnetic isolation groove 12 away from the outer circumference of the rotor punching 1 is the inner end. The inner end and the outer end are respectively located at the two ends of the length direction of the first magnetic isolation groove 12. The distance between the outer ends of the two first magnetic isolation grooves 12 is smaller than the distance between the inner ends of the two first magnetic isolation grooves 12. By reasonably arranging two first magnetic isolation grooves 12 in the opening of the V-shaped magnetic steel slot 11, the magnetic flux direction is sorted out, the interaction space of the stator and rotor magnetic fields is separated, the waveform of the generated voltage is affected, the q-axis inductance is reduced, the main harmonics are reduced, and the stability of the motor during operation is improved. Specifically, the angle between the two first magnetic isolation grooves 12 is 60°-70°. By way of example, the angle between the two first magnetic isolation grooves 12 can be 60°, 62°, 64°, 66°, 68° or 70°. The opening angle of the V-shaped magnetic steel groove 11 is 100°-110°. By way of example, the opening angle of the V-shaped magnetic steel groove 11 can be 100°, 102°, 104°, 106°, 108° or 110°.

[0034] Optionally, the outer circumference of the stator punching sheet 2 is alternately provided with a plurality of stator teeth 21 and a plurality of stator slots 22, the inner end and the outer end of the first magnetic isolation slot 12 are both arc-shaped, the distance between the centers of the two outer ends of the first magnetic isolation slots 12 is L, the slot width of the first magnetic isolation slot 12 is d, the tooth width of the stator tooth 21 is Ts, and the value of (Ld) / Ts is between 0.45 and 0.68. Exemplarily, the value of (Ld) / Ts can be 0.45, 0.5, 0.55, 0.6, 0.65 or 0.68. With such a configuration, by optimizing the various structural parameters in the V-shaped magnetic steel slot 11, the waveform of the rotor magnetic field output can be better controlled, which is beneficial to controlling the harmonics of the back electromotive force and improving the sinusoidality of the back electromotive force waveform.

[0035] Optionally, both ends of each V-shaped magnetic steel slot 11 are provided with a second magnetic isolation slot 13, and the second magnetic isolation slot 13 is spaced from the outer periphery of the rotor punching 1, each second magnetic isolation slot 13 protrudes toward the center line of the V-shaped magnetic steel slot 11, and the second magnetic isolation slot 13 is arc-shaped, the center line of the V-shaped magnetic steel slot 11 is L1, and the center line of the stator tooth 21 is L2. When one L1 coincides with one L2, the V-shaped magnetic steel slot 11 corresponding to L1 is set to the V-shaped magnetic steel slot 11. shaped magnetic steel slot, the stator tooth 21 corresponding to L2 is the set stator tooth, and the two stator slots 22 adjacent to the set stator tooth are both set stator slots, the center line of the set stator slot is L3, the two L3s intersect at the center of the rotor punching 1, and the two L3s pass through the center of the two second magnetic isolation slots 13 on the set V-shaped magnetic steel slot, respectively. Such a setting can further prevent the leakage of magnetic flux, reduce the useless inter-pole leakage magnetic flux generated by the rotor magnetic field, and improve the effective utilization rate of the rotor magnetic field. Further, the number of stator slots 22 is Z, and the angle between the two L3s is 360 / Z. In this embodiment, the number of stator slots 22 and stator teeth 21 is 12, and the number of V-shaped magnetic steel slots 11 is specifically 8. When the rotor punching 1 rotates to a certain angle, the center line of one of the V-shaped magnetic steel slots 11 can be aligned and overlapped with the center line of one of the stator teeth 21. Specifically, the radius of the second magnetic isolation groove 13 in an arc shape may be 0.2 mm-0.4 mm. Exemplarily, the radius of the second magnetic isolation groove 13 in an arc shape may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm or 0.4 mm.

[0036] Optionally, two triangular grooves 14 with triangular cross-sections are symmetrically arranged on the outer circumference of the rotor punching 1 corresponding to the center line of each V-shaped magnetic steel slot 11, and the triangular groove 14 includes a first side and a second side, the first side intersects with the outer circumference of the rotor punching 1 and the intersection is the first intersection, the second side intersects with the outer circumference of the rotor punching 1 and the intersection is the second intersection, the intersection between the first side and the second side is the third intersection, the first intersection is closer to the center line of the V-shaped magnetic steel slot 11 than the second intersection, and the second intersection is closer to the second magnetic isolation groove 13 than the first intersection; the first intersection, the second intersection and the third intersection of the two triangular grooves 14 corresponding to the V-shaped magnetic steel slot are set to D1, D2 and D3 respectively, and the two D2s coincide with the two L3s respectively; and / or, the two D2s are set one-to-one with the two second magnetic isolation grooves 13 on the V-shaped magnetic steel slot, and the minimum spacing between each D2 and the corresponding second magnetic isolation groove 13 is d1, 0.5mm≤d1≤0.7mm. By setting a suitable distance between the second magnetic isolation groove 13 and D2, the rotor punching sheet 1 is ensured to have a certain structural strength, and at the same time, excessive magnetic leakage is avoided to ensure the smooth and reliable operation of the motor.

[0037] Optionally, the stator tooth 21 includes two side walls 211 spaced apart along the circumferential direction of the stator punching sheet 2, two first arc surfaces 212 respectively connected to the two side walls 211, two first inclined surfaces 213 respectively connected to the two first inclined surfaces 212, and two second inclined surfaces 214 respectively connected to the two first inclined surfaces 213, the arc surface, the first inclined surface 213 and the second inclined surface 214 are successively away from the side wall 211, the stator tooth 21 also includes a second arc surface 215 parallel to the outer circumference of the rotor punching sheet 1 and spaced apart, and two connecting surfaces 216 connected between the second arc surface 215 and the two second inclined surfaces 214, chamfered corners 217 are provided between the two connecting surfaces 216 and the two second arc surfaces 215, the two endpoints of each chamfered corner 217 corresponding to the set stator tooth are S1 and S2, the straight lines passing through S1 and S2 respectively and parallel to the set stator tooth center line are C1 and C2, and D3 is located between C1 and C2. Furthermore, in order to improve the magnetic flux rate near the tooth top of the stator tooth 21 and reduce the saturation of the local magnetic flux at the tooth top, the first bevel 213 and the second bevel 214 are at an angle, and the first bevel 213 is farther away from the outer periphery of the rotor punching 1 than the second bevel 214, thereby increasing the winding space inside the stator slot 22 while providing more effective space for the arrangement of the magnetic flux lines near the slot, thereby reducing the magnetic field harmonics between the stator and rotor air gaps. Specifically, the radius of the fillet 217 can be 0.2mm-0.3mm. Exemplarily, the radius of the fillet 217 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm or 0.3mm.

[0038] Optionally, the intersection points between the two second inclined surfaces 214 of the stator teeth and the two connecting surfaces 216 are set to be D4, the distances from the two D4 to the center line of the set stator teeth are both h1, the distances from the two D1 to the center line of the set stator teeth are both h2, h1-h2=δ, and the gap distance between the inner periphery of the stator punching sheet 2 and the outer periphery of the rotor punching sheet 1 is also δ. This arrangement further improves the structural strength near the tooth top. Specifically, δ is 0.3mm-1mm, and illustratively, δ can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0039] Further, the straight line connecting D3 and the center of the rotor sheet 1 is L4, the intersection of L4 and the outer periphery of the rotor sheet 1 is D5, the distance between D5 and D3 is d2, 0.25δ≤d2≤0.75δ. For example, d2 can be 0.25δ, 0.35δ, 0.45δ, 0.55δ, 0.65δ or 0.75δ.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A motor punching structure, comprising a rotor punching (1), and a stator punching (2) sleeved on the outer circumference of the rotor punching (1), wherein the stator punching (2) and the rotor punching (1) are arranged at intervals, and a plurality of magnetic steel slots (11) are arranged in an annular array on the rotor punching (1), and the plurality of magnetic steel slots (11) are used to place magnetic steel, characterized in that: Each of the magnetic steel slots (11) is in a V-shape, and the opening of the V-shape faces the outer periphery of the rotor punching sheet (1). Two first magnetic isolation slots (12) are arranged in the opening of each of the V-shaped magnetic steel slots (11). The two first magnetic isolation slots (12) are symmetrically arranged about the center line of the V-shaped magnetic steel slot (11) and are in an eight-shaped shape. The end of each of the first magnetic isolation slots (12) close to the outer periphery of the rotor punching sheet (1) is the outer end, and the end of each of the first magnetic isolation slots (12) away from the outer periphery of the rotor punching sheet (1) is the inner end. The inner end and the outer end are respectively located at two ends of the length direction of the first magnetic isolation slot (12), and the distance between the outer ends of the two first magnetic isolation slots (12) is smaller than the distance between the inner ends of the two first magnetic isolation slots (12).

2. The motor punching structure according to claim 1, characterized in that: The outer circumference of the stator punching sheet (2) is alternately provided with a plurality of stator teeth (21) and a plurality of stator slots (22); the inner end and the outer end of the first magnetic isolation slot (12) are both arc-shaped; the distance between the centers of the two outer ends of the first magnetic isolation slots (12) is L; the slot width of the first magnetic isolation slot (12) is d; the tooth width of the stator teeth (21) is Ts; and the value of (Ld) / Ts is between 0.45 and 0.

68.

3. The motor punching structure according to claim 2, characterized in that: Both ends of each V-shaped magnetic steel slot (11) are provided with a second magnetic isolation slot (13), and the second magnetic isolation slot (13) is spaced from the outer periphery of the rotor punching sheet (1), each of the second magnetic isolation slots (13) protrudes toward the center line of the V-shaped magnetic steel slot (11), and the second magnetic isolation slot (13) is in an arc shape, the center line of the V-shaped magnetic steel slot (11) is L1, and the center line of the stator tooth (21) is L2, when one of L1 and the other is aligned, the second magnetic isolation slot (13) is in an arc shape, and the second magnetic isolation slot (13) is in an arc shape, and the center line of the V-shaped magnetic steel slot (11) is L1, and the center line of the stator tooth (21) is L2. When one L2 overlaps, the V-shaped magnetic steel slot (11) corresponding to L1 is a set V-shaped magnetic steel slot, the stator tooth (21) corresponding to L2 is a set stator tooth, and the two stator slots (22) adjacent to the set stator tooth are both set stator slots, the center line of the set stator slot is L3, the two L3s intersect at the center of the rotor punching sheet (1), and the two L3s pass through the center of the two second magnetic isolation slots (13) on the set V-shaped magnetic steel slot respectively.

4. The motor punching structure according to claim 3, characterized in that: Two triangular grooves (14) with triangular cross-sections are symmetrically arranged on the outer periphery of the rotor punching sheet (1) corresponding to the center line of each V-shaped magnetic steel groove (11), and the triangular groove (14) includes a first side and a second side, the first side intersects with the outer periphery of the rotor punching sheet (1) and the intersection point is a first intersection point, the second side intersects with the outer periphery of the rotor punching sheet (1) and the intersection point is a second intersection point, the intersection point between the first side and the second side is a third intersection point, the first intersection point is closer to the center line of the V-shaped magnetic steel groove (11) than the second intersection point, and the second intersection point is closer to the second magnetic isolation groove (13) than the first intersection point; The first intersection point, the second intersection point and the third intersection point of the two triangular grooves (14) corresponding to the V-shaped magnetic steel groove are set to be D1, D2 and D3 respectively, and the two D2s coincide with the two L3s respectively; and / or, The two D2 are arranged in one-to-one correspondence with the two second magnetic isolation grooves (13) on the set V-shaped magnetic steel groove, and the minimum distance between each D2 and the corresponding second magnetic isolation groove (13) is d1, 0.5mm≤d1≤0.7mm.

5. The motor punching structure according to claim 4, characterized in that: The stator tooth (21) comprises two side walls (211) arranged at intervals along the circumferential direction of the stator punching sheet (2), two first arc surfaces (212) respectively connected to the two side walls (211), two first inclined surfaces (213) respectively connected to the two first arc surfaces (212), and two second inclined surfaces (214) respectively connected to the two first inclined surfaces (213), wherein the arc surfaces, the first inclined surfaces (213) and the second inclined surfaces (214) are successively away from the side walls (211), and the stator tooth (21) further comprises a first arc surface (212) connected to the rotor punching sheet (2). The sheet (1) has second arc surfaces (215) which are parallel to and spaced from each other on the outer circumference thereof, and two connecting surfaces (216) connected between the second arc surfaces (215) and the two second inclined surfaces (214), and chamfers (217) are provided between the two connecting surfaces (216) and the two second arc surfaces (215), and two end points of each of the chamfers (217) corresponding to the set stator teeth are S1 and S2, respectively, and straight lines passing through S1 and S2 and parallel to the center line of the set stator teeth are C1 and C2, and D3 is located between C1 and C2.

6. The motor punching structure according to claim 5, characterized in that: The first inclined surface (213) and the second inclined surface (214) form an included angle, and the first inclined surface (213) is farther away from the outer periphery of the rotor punching sheet (1) than the second inclined surface (214).

7. The motor punching structure according to claim 5, characterized in that: The intersection points between the two second inclined surfaces (214) of the set stator teeth and the two connecting surfaces (216) are both D4, the distances between the two D4 and the center line of the set stator teeth are both h1, the distances between the two D1 and the center line of the set stator teeth are both h2, h1-h2=δ, and the gap distance between the inner periphery of the stator punching sheet (2) and the outer periphery of the rotor punching sheet (1) is also δ.

8. The motor punching structure according to claim 7, characterized in that: The δ is 0.3mm-1mm.

9. The motor punching structure according to claim 8, characterized in that: The straight line connecting D3 and the center of the rotor punching (1) is L4, the intersection of L4 and the outer periphery of the rotor punching (1) is D5, the distance between D5 and D3 is d2, and 0.25δ≤d2≤0.75δ.

10. The motor punching structure according to any one of claims 1 to 9, characterized in that: The included angle between the two first magnetic isolation grooves (12) is 60°-70°.

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