A permanent magnet motor rotor punching with high reluctance torque

Abstract

The present invention discloses a permanent magnet motor rotor punching with high magnetic resistance torque, comprising a rotor punching body and an axial hole, comprising a first V-shaped magnetic steel slot symmetrically arranged about the center line of the d-axis; a first, a second and a third magnetic isolation hole are arranged at both ends of the magnetic steel slot group, the outer edges of the first, the second and the third magnetic isolation holes away from the axial hole fall on the same circle, the inner edges of the first, the second and the third magnetic isolation holes close to the axial hole are on the same straight line, and a third magnetic isolation bridge with equal intervals is arranged between the first magnetic isolation hole and the first V-shaped magnetic steel slot, and the intersection of the edge of the first magnetic isolation hole close to the second magnetic isolation hole and the outer edge of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching is located on the center line of the third magnetic isolation bridge. The addition of the first, the second and the third magnetic isolation holes and the superposition of a larger number of magnetic isolation bridges can improve the mechanical properties of the rotor when running at high speed, which is conducive to the high speed of the motor, increasing the torque density of the motor and improving the speed regulation performance of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a permanent magnet motor rotor punching sheet with high reluctance torque. Background Art

[0002] Chinese patent CN113949183A discloses a rotor punching sheet, a rotor and a motor, such as Figure 1 As shown, a double-one type structure punching example is proposed. This patent adopts a double-one type topology, and the structure and process are simple, but the permanent magnet has a poor magnetic field concentration effect, and the armature reaction cross-axis loop channel is single, which is not conducive to the improvement of magnetic resistance torque and reduces the torque density of the motor. In addition, its double-one structure cannot flexibly adjust the magnetic circuit structure, which also affects the number of magnetic isolation bridges inside the punching, making the maximum speed of the rotor operation have certain limitations. Summary of the invention

[0003] In view of the above-mentioned defects in the prior art, a permanent magnet motor rotor punching with high reluctance torque is provided to improve the mechanical properties of the rotor when running at high speed, which is conducive to the high-speed operation of the motor; and the salient pole ratio and weak magnetic field speed expansion capability of the motor are improved.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A permanent magnet motor rotor punching with high magnetic resistance torque comprises a rotor punching body and an axial hole arranged at the center of the rotor punching body, the rotor punching body is divided into a plurality of unit magnetic poles, a plurality of magnetic steel slot groups are arranged on the unit magnetic poles, the magnetic steel slot group comprises a first V-shaped magnetic steel slot symmetrically arranged about the center line of the d-axis; the characteristic is that: a first magnetic isolation hole, a second magnetic isolation hole, and a third magnetic isolation hole are arranged at both ends of the magnetic steel slot group, the first, second and third magnetic isolation holes are parallel to each other and arranged at intervals, and the distances between the first, second and third magnetic isolation holes and the center line of the d-axis are from far to near; the outer edges of the first, second and third magnetic isolation holes away from the axial hole fall on the same circle, the inner edges of the first, second and third magnetic isolation holes close to the axial hole are on the same straight line, a third magnetic isolation bridge with equal intervals is arranged between the first magnetic isolation hole and the first V-shaped magnetic steel slot, and the intersection of the edge of the first magnetic isolation hole close to the second magnetic isolation hole and the outer edge of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching is located on the center line of the third magnetic isolation bridge.

[0006] According to the above technical solution, the spacing width H between the outer edge of the first magnetic isolation hole and the outer circle of the rotor punching sheet is 2 The value range is 1.0mm~1.4mm, and the width H of the third magnetic isolation bridge is 3 The value range is 0.6mm~1.0mm; the angle α between the edge line of the first magnetic isolation hole close to the second magnetic isolation hole and the outer edge line of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching 2The value range of is 120°~130°, and the angle α between the end side lines of the first V-shaped magnetic steel groove and the long side line of the magnetic steel 3 The value range is 110°~120°.

[0007] According to the above technical solution, the width W of the first magnetic isolation hole is 1 The value range is 2.8mm~4mm, and the fillet radius R of the four corners of the first magnetic isolation hole 1 The value range of is 0.5mm~0.8mm; the spacing distance L between the first magnetic isolation hole and the second magnetic isolation hole 1 The value range is 1.8mm~2.2mm, and the width W of the second magnetic isolation hole 2 The value range is 1.5mm~2.0mm, and the fillet radius R of the four corners of the second magnetic isolation hole 2 The value range of is 0.5mm~0.8mm; the third magnetic isolation hole presents a triangular structure, the vertex is the intersection of the inner edge line and the outer edge line of the third magnetic isolation hole, and the distance L between the third magnetic isolation hole and the second magnetic isolation hole is 2 The value range is 1.8mm~2.2mm, and the fillet radius R of the third magnetic isolation hole triangle 3 The value range is 0.5mm~0.8mm.

[0008] According to the above technical solution, the magnetic steel slot group also includes a second V-shaped magnetic steel slot symmetrically arranged about the center line of the d-axis, and the second V-shaped magnetic steel slot is arranged on the side of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching; the first magnetic steel slot includes a first side and a second side symmetrically arranged with each other, and the angle α between the first side and the second side 1 The value range of is 140°~160°, and a first magnetic isolation bridge of equal width is provided between the first side and the second side. The width H of the first magnetic isolation bridge 1 The value range of is 1.2mm~1.6mm; The second magnetic steel slot includes a third side and a fourth side arranged symmetrically with each other, and the angle β between the third side and the fourth side 1 The value range of is 175°~195°. A fourth magnetic isolation bridge of equal width is provided between the third side and the fourth side. The width H of the fourth magnetic isolation bridge is 4 The value range is 1.0mm~1.4mm.

[0009] According to the above technical solution, a fifth magnetic isolation bridge with equal spacing is provided between the third magnetic isolation hole and the second V-shaped magnetic steel groove. The width H of the fifth magnetic isolation bridge is 5 The value range is 0.5mm~0.8mm.

[0010] According to the above technical solution, a magnetic conductive protrusion is provided on the outer edge line of the third side and the fourth side close to the outer circle of the rotor punching sheet, and the magnetic conductive protrusion is provided at the non-adjacent ends of the third side and the fourth side; the edge line of the magnetic conductive protrusion is in the form of a straight line, the starting position of the edge line of the magnetic conductive protrusion is located on the long edge line of the magnetic steel, and the starting position of the edge line of the magnetic conductive protrusion is at a distance L from the short edge line of the magnetic steel. 3 The value range is 1.0mm~1.5mm, and the angle β between the edge of the magnetic protrusion and the long edge of the magnetic steel 2 The value range is 10°~15°, and the chamfer R at the connection between the edge of the magnetic conductive protrusion and the fifth magnetic isolation bridge 4 The value range is 0.5mm~1.0mm.

[0011] According to the above technical solution, an elliptical air groove is provided on the center line of the d-axis, and the air groove is located between the first V-shaped magnetic steel groove and the second V-shaped magnetic steel groove. The value range of the major axis a of the air groove is 3mm~4mm, and the value range of the minor axis b is 1mm~1.5mm. The value range of the minimum distance L4 between the intersection of the second V-shaped magnetic steel groove close to the side line of the shaft hole and the air groove is 0.8mm~1.0mm.

[0012] According to the above technical solution, an uneven air gap is provided on the unit magnetic pole, and the uneven air gap is provided on the outer circle of the rotor punching, and the two end points of the uneven air gap are the intersection points of the extension line of the outer short side line of the magnetic steel in the second V-shaped magnetic steel slot and the outer circle of the rotor punching; the uneven air gap includes an arc edge on the bottom surface and a straight edge for connecting the outer circle of the rotor punching, and the distance H between the arc edge and the outer circle of the rotor punching is 6 The value range of is 0.3mm~0.5mm, and the value range of the angle γ between the straight edge and the outer short side line of the magnetic steel in the second V-shaped magnetic steel groove is 45°~60°.

[0013] According to the above technical scheme, it includes rivet holes and pentagonal weight-reducing holes, the number of rivet holes and weight-reducing holes is consistent with the number of unit magnetic poles, the rivet holes are symmetrically arranged about the center line of the d-axis, and the weight-reducing holes are symmetrically arranged about the center line of the q-axis; the rivet holes and weight-reducing holes are both arranged on the inner side of the magnetic steel slot group.

[0014] According to the above technical solution, a keyway and a marking groove with an offset angle are provided on the shaft hole.

[0015] The present invention has the following beneficial effects:

[0016] 1. The addition of the first, second and third magnetic isolation holes and the addition of a larger number of magnetic isolation bridges improve the mechanical properties of the rotor when running at high speed, which is conducive to the high-speed operation of the motor; it also improves the salient pole rate and weak magnetic speed expansion capability of the motor, which is conducive to increasing the magnetic resistance torque of the motor and improving the torque density of the motor.

[0017] 2. The double-layer V-shaped topology structure has a magnetic field gathering effect and a large magnetic resistance torque. The increase of air slots is beneficial to the weight reduction of the motor, which is also equivalent to the magnetic barrier effect, guiding the direction of the magnetic lines of force and improving the magnetic line distribution of the rotor.

[0018] 3. The uneven air gap on the outer circle of the rotor makes the air gap magnetic flux waveform close to the sinusoidal distribution, reduces the harmonic component, improves the motor air gap magnetic field waveform, reduces the motor cogging torque, and improves the motor torque pulsation and NVH performance.

[0019] 4. Rivet holes and weight-reducing holes are set on the rotor punching body to facilitate the stacking of the rotor punching, which can reduce the rotor's rotational inertia, help reduce the weight of the motor, and meet the motor loading requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a rotor punching diagram of the prior art;

[0021] Figure 2 It is a schematic diagram of the structure of the rotor punching sheet provided in the embodiment of the present invention;

[0022] Figure 3 It is a punching topology diagram of an embodiment provided by the present invention;

[0023] Figure 4 is a schematic structural diagram of a unit magnetic pole according to an embodiment of the present invention;

[0024] Figure 5 Detailed view of the first V-shaped magnetic steel groove and the first magnetic isolation hole of the embodiment provided by the present invention;

[0025] Figure 6 is a detailed diagram of the second magnetic isolation hole of an embodiment provided by the present invention;

[0026] Figure 7 Detailed view of the second V-shaped magnetic steel groove and the third magnetic isolation hole of the embodiment provided by the present invention;

[0027] Figure 8 is a detailed view of the second V-shaped magnetic steel groove of the embodiment provided by the present invention;

[0028] Fig. 9 is a detailed view of an air slot according to an embodiment of the present invention;

[0029] Fig.10 is a detailed diagram of the uneven air gap of an embodiment provided by the present invention;

[0030] In the figure, 1, punching plate body; 2, shaft hole; 3, magnet; 4, first V-shaped magnet groove; 4-1, first side; 4-2, second side; 5-1, first magnetic isolation hole; 5-2, second magnetic isolation hole; 5-3, third magnetic isolation hole; 6-1, first magnetic isolation bridge; 6-2, second magnetic isolation bridge; 6-3, third magnetic isolation bridge; 6-4, fourth magnetic isolation bridge; 6-5, fifth magnetic isolation bridge; 7, second V-shaped magnet groove; 7-1, third side; 7-2, fourth side; 8, magnetic conductive protrusion; 9, air groove; 10, uneven air gap; 10-1, arc edge; 10-2, straight edge; 11, rivet hole; 12, weight reduction hole; 13, keyway; 14, marking groove; 15, outer circle of rotor punching plate; A, d-axis centerline; B, q-axis centerline. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] Reference Figure 2 to Figure 10 As shown, a permanent magnet motor rotor sheet with high magnetic resistance torque comprises a rotor sheet body 1 and an axial hole 2 arranged at the center of the rotor sheet body, the rotor sheet body is divided into a plurality of unit magnetic poles, a plurality of magnetic steel slot groups are arranged on the unit magnetic poles, and the magnetic steel slot group comprises a first V-shaped magnetic steel slot 4 symmetrically arranged about the d-axis center line A; it is characterized in that: a first magnetic isolation hole 5-1, a second magnetic isolation hole 5-2, and a third magnetic isolation hole 5-3 are arranged at both ends of the magnetic steel slot group, and the first, second and third magnetic isolation holes are parallel to each other and The first, second and third magnetic isolation holes are arranged at intervals, and the distances from the center line of the d-axis are from far to near; the outer edges of the first, second and third magnetic isolation holes away from the shaft hole fall on the same circle, and the inner edges of the first, second and third magnetic isolation holes close to the shaft hole are on the same straight line, and an equally spaced third magnetic isolation bridge 6-3 is provided between the first magnetic isolation hole and the first V-shaped magnetic steel slot, and the intersection of the edge of the first magnetic isolation hole close to the second magnetic isolation hole and the outer edge of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching 15 is located on the center line of the third magnetic isolation bridge.

[0033] Furthermore, a second magnetic isolation bridge 6-2 (i.e., the distance between the outer edge of the first magnetic isolation hole and the outer circle of the rotor punching) is provided between the first magnetic isolation hole and the rotor punching. 2 The value range is 1.0mm~1.4mm, and the width H of the third magnetic isolation bridge is 3 The value range is 0.6mm~1.0mm; the angle α between the edge line of the first magnetic isolation hole close to the second magnetic isolation hole and the outer edge line of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching 2 The value range of is 120°~130°, and the angle α between the end side lines of the first V-shaped magnetic steel groove and the long side line of the magnetic steel 3 3 The value range is 110°~120°.

[0034] Furthermore, the width W of the first magnetic isolation hole is 1 The value range is 2.8mm~4mm, and the fillet radius R of the four corners of the first magnetic isolation hole 1 The value range of is 0.5mm~0.8mm; the spacing distance L between the first magnetic isolation hole and the second magnetic isolation hole 1 The value range is 1.8mm~2.2mm, and the width W of the second magnetic isolation hole 2 The value range is 1.5mm~2.0mm, and the fillet radius R of the four corners of the second magnetic isolation hole 2 The value range of is 0.5mm~0.8mm; the third magnetic isolation hole presents a triangular structure, the vertex is the intersection of the inner edge line and the outer edge line of the third magnetic isolation hole, and the distance L between the third magnetic isolation hole and the second magnetic isolation hole is 2 The value range is 1.8mm~2.2mm, and the fillet radius R of the third magnetic isolation hole triangle 3 The value range is 0.5mm~0.8mm.

[0035] Furthermore, the magnetic steel slot group further includes a second V-shaped magnetic steel slot 7 arranged symmetrically about the center line of the d-axis, and the second V-shaped magnetic steel slot is arranged on the side of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching; the first magnetic steel slot includes a first side 4-1 and a second side 4-2 arranged symmetrically with each other, and the angle α between the first side and the second side is 1 The value range of is 140°~160°, and a first magnetic isolation bridge 6-1 of equal width is provided between the first side and the second side. The width H of the first magnetic isolation bridge 1 The value range is 1.2mm~1.6mm; the second magnetic steel slot includes a third side 7-1 and a fourth side 7-2 arranged symmetrically with each other, and the angle β between the third side and the fourth side 1 The value range of is 175°~195°, and a fourth magnetic isolation bridge 6-4 of equal width is provided between the third side and the fourth side. The width H of the fourth magnetic isolation bridge 4 The value range is 1.0mm~1.4mm.

[0036] Furthermore, a fifth magnetic isolation bridge 6-5 with equal intervals is provided between the third magnetic isolation hole and the second V-shaped magnetic steel groove, and the width H of the fifth magnetic isolation bridge is 5 The value range is 0.5mm~0.8mm.

[0037] Furthermore, a magnetic conductive protrusion 8 is provided on the outer edge line of the third side and the fourth side close to the outer circle of the rotor punching, and the magnetic conductive protrusion is provided at the non-adjacent ends of the third side and the fourth side; the edge line of the magnetic conductive protrusion is in the form of a straight line, the starting position of the edge line of the magnetic conductive protrusion is located on the long edge line of the magnetic steel, and the starting position of the edge line of the magnetic conductive protrusion is at a distance L from the short edge line of the magnetic steel. 3 The value range is 1.0mm~1.5mm, and the angle β between the edge of the magnetic protrusion and the long edge of the magnetic steel 2The value range is 10°~15°, and the chamfer R at the connection between the edge of the magnetic conductive protrusion and the fifth magnetic isolation bridge 4 The value range is 0.5mm~1.0mm.

[0038] Furthermore, an elliptical air groove 9 is provided on the center line of the d-axis, and the air groove is located between the first V-shaped magnetic steel groove and the second V-shaped magnetic steel groove. The value range of the major axis a of the air groove is 3mm~4mm, the value range of the minor axis b is 1mm~1.5mm, and the value range of the minimum distance L4 between the intersection of the second V-shaped magnetic steel groove close to the side line of the shaft hole and the air groove is 0.8mm~1.0mm.

[0039] Furthermore, an uneven air gap 10 is provided on the unit magnetic pole, and the uneven air gap is provided on the outer circle of the rotor punching, and the two end points of the uneven air gap are the intersection points of the extension line of the outer short side line of the magnetic steel in the second V-shaped magnetic steel slot and the outer circle of the rotor punching; the uneven air gap includes an arc edge 10-1 on the bottom surface and a straight edge 10-2 for connecting the outer circle of the rotor punching, and the distance H between the arc edge and the outer circle of the rotor punching is 6 The value range of is 0.3mm~0.5mm, and the value range of the angle γ between the straight edge and the outer short side line of the magnetic steel in the second V-shaped magnetic steel groove is 45°~60°.

[0040] Furthermore, it includes rivet holes 11 and pentagonal weight-reducing holes 12. The number of rivet holes and weight-reducing holes is consistent with the number of unit magnetic poles. The rivet holes are symmetrically arranged about the center line of the d axis, and the weight-reducing holes are symmetrically arranged about the center line B of the q axis. The rivet holes and weight-reducing holes are both arranged on the inner side of the magnetic steel slot group. The rivet holes and weight-reducing holes are arranged on the rotor punching body to facilitate the stacking of the rotor punching, reduce the rotational inertia of the rotor, and help reduce the weight of the motor to meet the motor loading requirements.

[0041] Furthermore, a keyway 13 and a marking groove 14 with an offset angle are provided on the shaft hole, which is beneficial to the segmented axial skew pole of the motor and improves the torque pulsation and NVH performance of the motor.

[0042] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A permanent magnet motor rotor sheet with high magnetic resistance torque, comprising a rotor sheet body and an axial hole arranged at the center of the rotor sheet body, wherein the rotor sheet body is divided into a plurality of unit magnetic poles, and a plurality of magnetic steel slot groups are arranged on the unit magnetic poles, wherein the magnetic steel slot groups include first V-shaped magnetic steel slots symmetrically arranged about the center line of the d-axis; characterized in that: A first magnetic isolation hole, a second magnetic isolation hole, and a third magnetic isolation hole are provided at both ends of the magnetic steel slot group. The first, second, and third magnetic isolation holes are parallel to each other and arranged at intervals. The distances between the first, second, and third magnetic isolation holes and the center line of the d-axis are from far to near; the outer edges of the first, second, and third magnetic isolation holes away from the shaft hole fall on the same circle, and the inner edges of the first, second, and third magnetic isolation holes close to the shaft hole are on the same straight line. An equally spaced third magnetic isolation bridge is provided between the first magnetic isolation hole and the first V-shaped magnetic steel slot, and the intersection of the edge of the first magnetic isolation hole close to the second magnetic isolation hole and the outer edge of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching is located on the center line of the third magnetic isolation bridge; The magnetic steel slot group also includes a second V-shaped magnetic steel slot symmetrically arranged about the center line of the d-axis, and the second V-shaped magnetic steel slot is arranged on the side of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching; the first magnetic steel slot includes a first side and a second side symmetrically arranged, and the value range of the angle α1 between the first side and the second side is 140° to 160°, and a first magnetic isolation bridge of equal width is provided between the first side and the second side, and the value range of the width H1 of the first magnetic isolation bridge is 1.2mm to 1.6mm; the second magnetic steel slot includes a third side and a fourth side symmetrically arranged, and the value range of the angle β1 between the third side and the fourth side is 175° to 195°, and a fourth magnetic isolation bridge of equal width is provided between the third side and the fourth side, and the value range of the width H4 of the fourth magnetic isolation bridge is 1.0mm to 1.4mm; Magnetic protrusions are provided on the outer edge lines of the third and fourth sides close to the outer circle of the rotor punching sheets, and the magnetic protrusions are provided at non-adjacent ends of the third and fourth sides; the edge lines of the magnetic protrusions are in the form of straight lines, the starting position of the edge lines of the magnetic protrusions is located on the long edge line of the magnetic steel, and the distance L3 from the starting position of the edge line of the magnetic protrusions to the short edge line of the magnetic steel is in the range of 1.0mm to 1.5mm, the angle β2 between the edge line of the magnetic protrusions and the long edge line of the magnetic steel is in the range of 10° to 15°, and the chamfer R4 at the connection between the edge line of the magnetic protrusions and the fifth magnetic isolation bridge is in the range of 0.5mm to 1.0mm.

2. The high reluctance torque permanent magnet motor rotor punching sheet according to claim 1, characterized in that: The value range of the interval width H2 between the outer edge line of the first magnetic isolation hole and the outer circle of the rotor punching is 1.0mm~1.4mm, and the value range of the width H3 of the third magnetic isolation bridge is 0.6mm~1.0mm; the value range of the angle α2 between the edge line of the first magnetic isolation hole adjacent to the second magnetic isolation hole and the outer edge line of the first V-shaped magnetic steel slot close to the outer circle of the rotor punching is 120°~130°, and the value range of the angle α3 between the end edge lines at both ends of the first V-shaped magnetic steel slot and the long edge line of the magnetic steel is 110°~120°.

3. The high reluctance torque permanent magnet motor rotor punching sheet according to claim 1, characterized in that: The width W1 of the first magnetic isolation hole ranges from 2.8mm to 4mm, and the fillet radius R1 of the four corners of the first magnetic isolation hole ranges from 0.5mm to 0.8mm; the spacing distance L1 between the first magnetic isolation hole and the second magnetic isolation hole ranges from 1.8mm to 2.2mm, the width W2 of the second magnetic isolation hole ranges from 1.5mm to 2.0mm, and the fillet radius R2 of the four corners of the second magnetic isolation hole ranges from 0.5mm to 0.8mm; the third magnetic isolation hole has a triangular structure, the vertex of which is the intersection of the inner and outer edges of the third magnetic isolation hole, the distance L2 between the third magnetic isolation hole and the second magnetic isolation hole ranges from 1.8mm to 2.2mm, and the fillet radius R3 of the triangle of the third magnetic isolation hole ranges from 0.5mm to 0.8mm.

4. The high reluctance torque permanent magnet motor rotor punching sheet according to claim 1, characterized in that: A fifth magnetic isolation bridge with equal intervals is provided between the third magnetic isolation hole and the second V-shaped magnetic steel groove, and a width H5 of the fifth magnetic isolation bridge ranges from 0.5 mm to 0.8 mm.

5. The high reluctance torque permanent magnet motor rotor punching sheet according to claim 1, characterized in that: An elliptical air groove is provided on the center line of the d-axis, and the air groove is located between the first V-shaped magnetic steel groove and the second V-shaped magnetic steel groove. The value range of the major axis a of the air groove is 3mm~4mm, the value range of the minor axis b is 1mm~1.5mm, and the value range of the minimum distance L4 between the intersection of the second V-shaped magnetic steel groove close to the side line of the shaft hole and the air groove is 0.8mm~1.0mm.

6. The high reluctance torque permanent magnet motor rotor punching sheet according to claim 1, characterized in that: An uneven air gap is provided on the unit magnetic pole, and the uneven air gap is provided on the outer circle of the rotor punching, and the two end points of the uneven air gap are the intersection points of the extension line of the outer short side line of the magnetic steel in the second V-shaped magnetic steel slot and the outer circle of the rotor punching; the uneven air gap includes an arc edge on the bottom surface and a straight edge for connecting the outer circle of the rotor punching, and the distance H6 between the arc edge and the outer circle of the rotor punching ranges from 0.3mm to 0.5mm, and the angle γ between the straight edge and the outer short side line of the magnetic steel in the second V-shaped magnetic steel slot ranges from 45° to 60°.

7. The high reluctance torque permanent magnet motor rotor punching sheet according to claim 1, characterized in that: It includes rivet holes and pentagonal weight-reducing holes, the number of rivet holes and weight-reducing holes is consistent with the number of unit magnetic poles, the rivet holes are symmetrically arranged about the center line of the d-axis, and the weight-reducing holes are symmetrically arranged about the center line of the q-axis; the rivet holes and weight-reducing holes are both arranged on the inner side of the magnetic steel slot group.

8. The high reluctance torque permanent magnet motor rotor punching sheet according to claim 1, characterized in that: A keyway and a marking groove with an offset angle are provided on the shaft hole.

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