CN114362401A - A permanent magnet synchronous motor rotor punching structure and its rotor for a compound electric motorcycle - Google Patents

Abstract

The invention discloses a rotor punching structure for a permanent magnet synchronous motor for a compound electric motorcycle, which comprises a punching body. The punching body is divided into a plurality of fan-shaped areas with equal shapes and sizes. The fan-shaped areas are arranged near the arc edge. There is a slot group, the slot group includes an inner layer slot body and an outer layer slot body respectively used for installing the magnetic steel; the inner layer slot body includes two inner layer side grooves symmetrically arranged around the center line of the sector area , the two inner layer side grooves are arranged in a "V" shape, and the "V"-shaped openings formed by the two inner layer side grooves are arranged toward the arc edge of the fan-shaped area, and both the inner layer side grooves are in the shape of a "V". Arc-shaped, one end of the two inner layer side grooves that are close to each other is respectively provided with an inner layer middle magnetic isolation groove, and one end of the two inner layer side grooves away from each other is respectively provided with an inner layer side magnetic isolation groove; The outer groove body is symmetrically arranged at the centerline of the sector. The invention also discloses a permanent magnet synchronous motor rotor for a compound electric motorcycle.

Description

A rotor punching structure of a permanent magnet synchronous motor for a compound electric motorcycle and its rotor

technical field

The invention relates to the technical field of motor equipment, in particular to a rotor punching structure of a permanent magnet synchronous motor for a compound electric motorcycle and a rotor thereof.

Background technique

With the continuous deterioration of the natural environment and the shortage of fossil energy supply, electric vehicles are an effective way to ensure the flexibility of human mobility and achieve sustainable development of the automobile industry while reducing dependence on fossil fuels and environmental pollution. As a new type of clean energy, electric energy will become an inevitable trend of future energy development, and electric vehicles will inevitably replace traditional fuel vehicles as the dominant means of transportation in the new era. Electric vehicles include electric passenger cars, electric buses, electric logistics vehicles, electric motorcycles and electric bicycles and other means of transportation that use power as the main driving force. Compared with electric vehicles, electric motorcycles are more convenient, smoother, more energy-saving and lower-cost. Especially in the city center with current traffic congestion, second- and third-tier cities with lower income costs and urban traffic are the first choice for travel.

However, in the current design and practical application of the permanent magnet synchronous motor rotor for most of the duplex electric motorcycles, there are many problems that we cannot ignore, such as large motor leakage flux, low power factor, poor sinusoidal back EMF, low efficiency, Large vibration and noise, high-efficiency operating area is small.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the prior art, the present invention provides a rotor punching structure of a permanent magnet synchronous motor for a compound electric motorcycle and a rotor thereof.

The technical scheme adopted in the present invention is:

A permanent magnet synchronous motor rotor punching structure for a compound electric motorcycle, comprising a punching body, the punching body is divided into a plurality of fan-shaped areas of equal shape and size, and a groove group is provided near the arc edge of the fan-shaped area. The slot group includes an inner layer slot body and an outer layer slot body respectively used for installing the magnetic steel, the outer layer slot body is arranged on the side of the inner layer slot body close to the arc edge of the sector area; the inner layer slot body includes Two inner layer side grooves are symmetrically arranged with the center line of the sector area as the center, the two inner layer side grooves are arranged in a "V" shape, and the "V" shape openings formed by the two inner layer side grooves It is arranged towards the arc edge of the sector area, the two inner layer side grooves are arc-shaped, and the ends of the two inner layer side grooves that are close to each other are respectively provided with inner layer magnetic isolation grooves in the middle, and the two inner layer middle magnetic isolation grooves. There is a gap between the grooves, and the ends of the two inner layer side grooves away from each other are respectively provided with inner layer side magnetic isolation grooves; the outer layer groove bodies are symmetrically arranged at the center line of the sector area.

Preferably, two ends of the side edge of the inner layer side groove away from the arc edge of the sector area are respectively provided with inner layer side convex grooves that protrude outward, and the inner layer side convex grooves are along the inner layer side. The radial protrusion of the inner layer side groove is communicated with the inner layer side groove.

Preferably, the side of the connection between the magnetic isolation groove in the middle of the inner layer and the side groove of the inner layer is concave toward the arc edge of the sector, and the magnetic isolation groove in the middle of the inner layer is close to the center line of the sector. One side is parallel to each other.

Preferably, the side of the connection between the inner-layer side magnetic isolation groove and the inner-layer side groove is recessed toward the centerline of the fan-shaped area on a side away from the centerline of the sector.

Preferably, the outer layer groove body includes two first outer layer side grooves arranged in a "V" shape and symmetrically arranged with the center line of the fan-shaped area. The "V"-shaped opening faces the arc edge of the fan-shaped area, so The first outer layer side groove is rectangular, and two corners of one side of the first outer layer side groove close to the center line of the sector area are respectively provided with outwardly protruding first outer layer side convex grooves, The first outer layer side groove is provided with a first outer layer side convex groove at one end of the side away from the center line of the sector area close to the circle center of the fan area, and the convex direction of the first outer layer side convex groove Consistent with the direction of the two sides of the side groove of the first outer layer, the side of the side groove of the first outer layer close to the center line of the sector area is provided with a first outer layer middle magnetic isolation at one end of the arc edge of the sector area. The magnetic isolation slot in the middle part of the first outer layer is in the shape of a triangle, one side of the magnetic isolation slot in the middle part of the first outer layer is communicated with the side groove of the first outer layer, and this part of the magnetic isolation slot in the middle part of the first outer layer is connected. The included angle between the edge and the other two sides of the magnetic isolation groove in the middle of the first outer layer that is close to the arc edge of the sector is an acute angle, and the side of the side groove of the first outer layer away from the center line of the sector is close to the sector. One end of the arc edge of the area is provided with a first outer layer side magnetic isolation slot, the first outer layer side magnetic isolation slot is triangular, and one side of the first outer layer side magnetic isolation slot is connected to the first outer layer. The side grooves are connected, and the included angle between the side of the first outer layer side magnetic isolation groove and the side close to the arc edge of the sector area in the other two sides of the first outer layer side magnetic isolation groove is an acute angle.

Preferably, the outer layer groove body includes a first outer layer middle groove and a second outer layer side magnetic isolation groove provided on both sides of the first outer layer middle groove, and the first outer layer middle groove is rectangular and symmetrical It is located at the centerline of the sector, the two corners of the first outer layer middle groove near the center of the sector are respectively provided with outwardly protruding outer layer middle convex grooves, the outer layer middle convex grooves The convex direction of the first outer layer is consistent with the direction of the two sides of the middle groove of the first outer layer, and the second outer layer side magnetic isolation groove is arranged at the two corners of the side of the first outer layer middle groove close to the arc edge of the sector area, The magnetic isolation groove on the side of the second outer layer is in the shape of a trapezoid, one of the waist sides of the trapezoid is communicated with the middle groove of the first outer layer, and the shorter bottom side of the trapezoid is located on the side of the longer bottom side close to the arc side of the sector area , the included angle between the bottom edge of the trapezoid and the side edge of the middle groove of the first outer layer close to the arc edge of the sector area is an obtuse angle.

Preferably, the outer layer groove body includes a second outer layer middle groove and second outer layer side grooves provided on both sides of the second outer layer middle groove, and the second outer layer middle groove is rectangular and symmetrically arranged. At the centerline of the fan-shaped area, a third outer-layer side magnetic isolation groove is respectively provided on the two sides of the second outer-layer middle groove close to one end of the arc side of the fan-shaped area, and the third outer-layer side part is separated from each other. The magnetic slot is in the shape of a triangle, one side of the magnetic isolation slot on the side of the third outer layer is communicated with the middle slot of the second outer layer, and the side of the magnetic isolation slot on the side of the third outer layer is separated from the side of the third outer layer. The angle between the other two sides of the magnetic slot near the arc edge of the sector is an acute angle, the second outer layer side slot is triangular, and the second outer layer side slot is close to one side of the second outer layer middle slot The second outer layer side magnetic isolation slot is provided with a gap between the second outer layer side magnetic isolation slot and the third outer layer side magnetic isolation slot.

A permanent magnet synchronous motor rotor for a compound electric motorcycle is formed by stacking a plurality of punching pieces having the punching structure of any of the above-mentioned permanent magnet synchronous motor rotors for a compound electric motorcycle.

The beneficial effects of the present invention are: the rotor air-gap magnetic density made by the rotor punching structure of the present invention is more sinusoidal, the harmonic content of the motor can be reduced, the motor efficiency can be improved, the reluctance torque of the motor can be increased, and the output torque of the motor can be increased. Motor field weakening speed expansion capability.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of the present invention;

Fig. 2 is the structural schematic diagram after the magnetic steel is assembled in Embodiment 1 of the present invention;

3 is a schematic structural diagram of a single sector in Embodiment 1 of the present invention;

4 is a schematic structural diagram of a single sector after assembling magnetic steel in Embodiment 1 of the present invention;

5 is a schematic structural diagram of a single sector in Embodiment 2 of the present invention;

6 is a schematic structural diagram of a single sector in Embodiment 3 of the present invention;

Reference numerals: 10, punching body, 20, sector area, 30, inner layer side groove, 31, inner layer middle magnetic isolation groove, 32, inner layer side magnetic isolation groove, 33, inner layer side convex groove , 40, the first outer layer side groove, 41, the first outer layer side convex groove, 42, the first outer layer middle magnetic isolation groove, 43, the first outer layer side magnetic isolation groove, 44, the first outer layer Layer middle slot, 45, second outer layer side magnetic isolation slot, 46, outer layer middle convex slot, 47, second outer layer middle slot, 48, second outer layer side slot, 49, third outer layer side Part of the magnetic slot, 50, magnetic steel.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

As shown in Figures 1-4, a permanent magnet synchronous motor rotor punching structure for a compound electric motorcycle includes a punching body 10, and the punching body 10 is divided into a plurality of sector-shaped areas 20 of equal shape and size. The sector 20 is provided with a slot group near the arc edge, and the slot group includes an inner slot body and an outer slot body for installing the magnetic steel 50 respectively, and the outer slot body is arranged in the inner slot body near the sector zone. 20 one side of the arc edge; the inner layer groove body includes two inner layer side grooves 30 symmetrically arranged with the center line of the sector 20 as the center, and the two inner layer side grooves 30 are arranged in a "V" shape, And the "V"-shaped openings formed by the two inner layer side grooves 30 are arranged toward the arc edge of the fan-shaped area 20, the two inner layer side grooves 30 are arc-shaped, and the two inner layer side grooves 30 are opposite to each other. One end that is close to each other is provided with a magnetic isolation groove 31 in the middle of the inner layer, there is a gap between the two magnetic isolation grooves 31 in the middle of the inner layer, and the ends of the two inner layer side grooves 30 away from each other are respectively provided with inner layer side partitions. Magnetic slot 32 ; the outer slot body is symmetrically arranged at the centerline of sector 20 .

Specifically, two ends of the side edge of the inner layer side groove 30 away from the arc edge of the sector 20 are respectively provided with inner layer side convex grooves 33 that protrude outward. The inner layer side convex grooves 33 Protruding along the radial direction of the inner layer side groove 30 , the inner layer side convex groove 33 communicates with the inner layer side groove 30 .

Specifically, the side of the connection between the inner layer middle magnetic isolation slot 31 and the inner layer side slot 30 close to the center of the sector 20 is concave toward the arc edge of the sector 20, and the two inner magnetic isolation slots 31 are close to each other. One side of the center line of the sector 20 is parallel to each other.

Specifically, the side of the connection between the inner-layer side magnetic isolation groove 32 and the inner-layer side groove 30 away from the centerline of the sector 20 is recessed toward the centerline of the sector 20 .

Specifically, the outer layer groove body includes two first outer layer side grooves 40 arranged in a "V" shape and symmetrically arranged with the center line of the fan-shaped area 20. The "V"-shaped opening is arced toward the fan-shaped area 20. The side grooves 40 of the first outer layer are rectangular, and two corners of one side of the side grooves 40 of the first outer layer close to the center line of the sector 20 are respectively provided with first outer protrusions that protrude outwards. The side convex groove 41 of the first outer layer is provided with a first outer layer side convex groove 41 at one end of the side of the first outer layer side groove 40 that is far from the center line of the sector 20 and close to the center of the sector 20. The protruding direction of an outer layer side groove 41 is consistent with the direction of the two sides of the first outer layer side groove 40, and the side of the first outer layer side groove 40 close to the centerline of the sector 20 is close to the fan One end of the arc edge of the zone 20 is provided with a first outer layer middle magnetic isolation slot 42, the first outer layer middle magnetic isolation slot 42 is triangular, and one side of the first outer layer middle magnetic isolation slot 42 is connected to the first outer layer. The side grooves 40 of the layer are connected, and the included angle between this side of the first outer layer middle magnetic isolation groove 42 and the side close to the arc edge of the sector 20 in the other two sides of the first outer layer middle magnetic isolation groove 42 For an acute angle, the side of the first outer layer side groove 40 away from the center line of the sector 20 is provided with a first outer layer side magnetic isolation groove 43 at one end of the side close to the arc edge of the sector 20. The layer side magnetic isolation slot 43 is triangular in shape, one side of the first outer layer side magnetic isolation slot 43 communicates with the first outer layer side slot 40 , and the first outer layer side magnetic isolation slot 43 has a triangular shape. The included angle between the edge and the edge close to the arc edge of the sector 20 in the other two edges of the magnetic isolation groove 43 on the side of the first outer layer is an acute angle.

The gap between the magnetic isolation grooves 31 in the middle of the two inner layers forms a magnetic bridge, which can increase the speed of the motor and increase the weak magnetic expansion capacity of the motor. The magnetic steel 50 is fixedly arranged through the inner layer side groove 30 and the first outer layer side groove 40 , when the motor is adjusted and rotated, the inner layer side groove 30 and the first outer layer side groove 40 can prevent the magnetic steel 50 from moving.

In terms of design, the length of the adjacent side of the magnetic isolation slot 31 in the middle of the inner layer is greater than the width of the side slot 30 in the inner layer, so that the length of the magnetic bridge between the magnetic isolation slots 31 in the middle of the inner layer is greater than that in the side slot 30 in the inner layer. The width of the installed magnetic steel 50 can ensure sufficient magnetic bridge strength when the motor runs at high speed, and at the same time minimize the magnetic leakage of the magnetic steel 50 and save the amount of the magnetic steel 50; the width of the magnetic isolation groove 32 on the side of the inner layer It is smaller than the width of the inner side slot 30. In this way, when the width of the magnetic steel 50 is large and the tooth width of the motor stator is small, the magnetic pole width of the motor and the motor pole arc coefficient can be flexibly adjusted, so that the motor torque can be increased while reducing the motor Torque fluctuations.

A magnetic bridge is formed between the magnetic isolation slots 42 in the middle of the two first outer layers, which can increase the speed of the motor and increase the field weakening capability of the motor. Reducing the amount of the outer-layer magnetic steel 50, and at the same time, the outer-layer magnetic steel 50 being narrower can reduce the eddy current loss of the outer-layer magnetic steel 50 and improve the demagnetization ability of the magnetic steel 50. The opposite sides of the magnetic isolation grooves 42 in the middle of the two first outer layers are arranged in parallel with each other, and the lengths are larger than the width of the side grooves 40 of the first outer layer, so that the length of the magnetic bridge between the magnetic isolation grooves 42 in the middle of the two first outer layers is longer. It is long enough to ensure sufficient magnetic bridge strength when the motor runs at high speed, and at the same time, minimize the magnetic flux leakage of the magnetic steel 50 and save the amount of the magnetic steel 50. The magnetic isolation groove 43 on the side of the first outer layer can play a role in adjusting the saturation degree of the magnetic field strength of the punching sheet, so that the air gap magnetic density is closer to sinusoidal, which can effectively suppress the higher harmonics of the motor, reduce the torque fluctuation of the motor, and reduce the Motor noise, improve motor efficiency.

Example 2

This embodiment is basically the same as Embodiment 1, except that the structure of the outer layer groove body is different. As shown in FIG. 5 , the outer layer groove body in this embodiment includes a first outer layer middle groove 44 and a groove 44 in the first outer layer. The second outer layer side magnetic isolation slots 45 on both sides of the layer middle slot 44, the first outer layer middle slot 44 is rectangular and symmetrically arranged at the centerline of the sector 20, the first outer layer middle slot The two corners of the side near the center of the sector 20 are respectively provided with outer-layer middle convex grooves 46 that protrude outwards. The side directions are the same, the second outer layer side magnetic isolation grooves 45 are arranged at the two corners of the side of the first outer layer middle groove 44 close to the arc edge of the sector 20, and the second outer layer side magnetic isolation grooves The groove 45 is in the shape of a trapezoid, one of the waist sides of the trapezoid is communicated with the groove 44 in the middle part of the first outer layer, the shorter bottom side of the trapezoid is located on the side of the longer bottom side close to the arc side of the sector 20, and the bottom side of the trapezoid is connected to the side of the arc side of the sector 20. The included angle between the side edges of the first outer layer middle groove 44 close to the arc edge of the sector 20 is an obtuse angle.

The width of the middle groove 44 of the first outer layer is smaller than the width of the side groove 30 of the inner layer, which can reduce the amount of the magnetic steel 50 in the outer layer. Demagnetization ability of steel 50. The magnetic isolation groove 45 on the side of the second outer layer can reduce the magnetic leakage of the magnetic steel 50 and save the amount of the magnetic steel 50 . The magnetic isolation groove 45 on the side of the second outer layer can also play a role in adjusting the saturation degree of the magnetic field strength of the punching sheet, so that the air gap magnetic density is closer to sinusoidal, which can effectively suppress the higher harmonics of the motor and reduce the torque fluctuation of the motor. Reduce motor noise and improve motor efficiency.

Example 3

This embodiment is basically the same as Embodiment 1, except that the structure of the outer layer groove body is different. As shown in FIG. 6 , the outer layer groove body in this embodiment includes a second outer layer middle groove 47 and a groove 47 in the second outer layer. The second outer layer side grooves 48 on both sides of the layer middle groove 47, the second outer layer middle groove 47 is rectangular and symmetrically arranged at the centerline of the sector 20, the second outer layer middle groove 47 is A third outer layer side magnetic isolation slot 49 is respectively provided at one end of the two sides close to the arc edge of the sector 20, the third outer layer side magnetic isolation slot 49 is triangular, and the third outer layer side magnetic isolation slot 49 is a triangle. One side of the magnetic slot 49 communicates with the second outer layer middle slot 47, and the side of the third outer layer side magnetic isolation slot 49 and the other two sides of the third outer layer side magnetic isolation slot 49 are close to the sector 20. The included angle between one side of the arc edge is an acute angle, the second outer layer side groove 48 is triangular, and the second outer layer side groove 48 is close to one side of the second outer layer middle groove 47 and the third outer layer side The other two sides of the partial magnetic isolation slot 49 are arranged in parallel with one side close to the arc edge of the sector 20 , and there is a gap between the second outer layer side slot 48 and the third outer layer side magnetic isolation slot 49 .

The width of the middle groove 47 of the second outer layer is smaller than the width of the side groove 30 of the inner layer, which can reduce the amount of the magnetic steel 50 in the outer layer. Demagnetization ability of steel 50. A magnetic bridge is formed between the side of the second outer layer side groove 48 facing the third outer layer side magnetic isolation groove 49 and the third outer layer side magnetic isolation groove 49, which can increase the motor speed and increase the motor's field weakening ability. The second outer layer side groove 48 and the third outer layer side magnetic isolation groove 49 can reduce the magnetic leakage of the magnetic steel 50 and save the amount of the magnetic steel 50 . The magnetic isolation groove 49 on the side of the third outer layer can also play a role in adjusting the saturation degree of the magnetic field strength of the punching sheet, so that the air gap magnetic density is closer to sinusoidal, which can effectively suppress the higher harmonics of the motor and reduce the torque fluctuation of the motor. Reduce motor noise and improve motor efficiency.

Example 4

A permanent magnet synchronous motor rotor for a compound electric motorcycle is formed by stacking a plurality of punching pieces having the punching structure of the permanent magnet synchronous motor rotor for a compound electric motorcycle according to any one of Embodiments 1-3.

The rotor air-gap magnetic density made by the rotor punching structure of the present invention is more sinusoidal, which can reduce the harmonic content of the motor and improve the efficiency of the motor, and can increase the reluctance torque of the motor to increase the output torque of the motor, and improve the field weakening speed expansion capability of the motor.

The above-mentioned embodiments only represent specific embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention.

Claims (8)

1. a permanent magnet synchronous motor rotor punching structure for a compound electric motorcycle, is characterized in that, comprises punching body (10), and described punching body (10) is divided into a plurality of sector-shaped areas (20 equal in shape and size) ), the sector (20) is provided with a groove group near the arc edge, and the groove group includes an inner layer groove body and an outer layer groove body respectively used for installing the magnetic steel (50), and the outer layer groove body is provided with on the side of the inner layer groove body close to the arc edge of the sector (20); the inner layer groove body comprises two inner layer side grooves (30) symmetrically arranged around the center line of the fan-shaped area (20), two The inner layer side grooves (30) are arranged in a "V" shape, and the "V"-shaped openings formed by the two inner layer side grooves (30) are arranged towards the arc edge of the sector (20), and the two inner layer side grooves (30) are arranged in a "V" shape. The side grooves (30) of the layers are all arc-shaped, and the ends of the two inner layer side grooves (30) that are close to each other are respectively provided with a magnetic isolation groove (31) in the middle of the inner layer, and the magnetic isolation grooves in the middle of the inner layer (31). 31) There is a gap between, and the ends of the two inner layer side grooves (30) away from each other are respectively provided with inner layer side magnetic isolation grooves (32); the outer layer groove bodies are symmetrically arranged in the sector area (20). ) at the centerline. 2. The permanent magnet synchronous motor rotor punching structure for compound electric motorcycle according to claim 1, wherein the inner layer side groove (30) is away from one side of the arc edge of the sector (20) Both ends are respectively provided with inner layer side convex grooves (33) that protrude outwards, the inner layer side convex grooves (33) protrude along the radial direction of the inner layer side groove (30), and the inner layer side convex grooves (33) The layer side convex groove (33) communicates with the inner layer side groove (30). 3 . The permanent magnet synchronous motor rotor punching structure for compound electric motorcycle according to claim 2 , characterized in that, the connection between the magnetic isolation groove ( 31 ) in the middle part of the inner layer and the side groove ( 30 ) in the inner layer The side near the center of the sector (20) is concave toward the arc edge of the sector (20), and the sides of the two inner-layer magnetic isolation grooves (31) near the centerline of the sector (20) are parallel to each other. 4. The permanent magnet synchronous motor rotor punching structure for a compound electric motorcycle according to claim 3, characterized in that the connection between the inner layer side magnetic isolation groove (32) and the inner layer side groove (30) The side away from the centerline of the fan-shaped area (20) is concave toward the centerline of the fan-shaped area (20). 5. The permanent magnet synchronous motor rotor punching structure for a compound electric motorcycle according to claim 4, wherein the outer groove body comprises two "V"-shaped arrangements and the center of the sector (20) The first outer layer side grooves (40) are arranged symmetrically with each other, the "V"-shaped opening faces the arc edge of the sector (20), the first outer layer side grooves (40) are rectangular, and the first outer layer side grooves (40) are rectangular. An outer layer side groove (40) is provided with first outer layer side grooves (41) protruding outwards at the two corners of one side of the side close to the centerline of the sector (20), respectively. A first outer layer side convex groove (41) is provided at one end of the side of the layer side groove (40) away from the center line of the sector (20) and close to the circle center of the sector (20). The convex direction of the external convex groove (41) is consistent with the direction of the two sides of the first outer layer side groove (40), and the first outer layer side groove (40) is close to one side of the center line of the sector (20). One end of the side near the arc edge of the sector (20) is provided with a first outer layer middle magnetic isolation groove (42), the first outer layer middle magnetic isolation groove (42) is triangular, and the first outer layer middle One side of the magnetic isolation groove (42) is communicated with the first outer layer side groove (40), and the side of the first outer layer middle magnetic isolation groove (42) is connected with the first outer layer middle magnetic isolation groove (42) The included angle between the other two sides near the arc edge of the fan-shaped area (20) is an acute angle, and the side of the first outer layer side groove (40) away from the centerline of the fan-shaped area (20) is close to the fan-shaped area. (20) One end of the arc edge is provided with a first outer layer side magnetic isolation groove (43), the first outer layer side magnetic isolation groove (43) is triangular, and the first outer layer side magnetic isolation groove (43) One side of the groove (43) is communicated with the first outer layer side groove (40), and the side of the first outer layer side magnetic isolation groove (43) is connected with the first outer layer side magnetic isolation groove (43) The included angle between the other two sides of the , which is close to the arc side of the sector (20) is an acute angle. 6. The permanent magnet synchronous motor rotor punching structure for compound electric motorcycles according to claim 4, wherein the outer layer groove body comprises a first outer layer middle groove (44) and a groove (44) provided in the first outer layer. The second outer layer side magnetic isolation slots (45) on both sides of the middle slot (44), the first outer layer middle slot (44) is rectangular and symmetrically arranged at the centerline of the sector (20), so Two corners of the first outer layer middle groove (44) on one side close to the center of the sector (20) are respectively provided with outwardly protruding outer layer middle convex grooves (46). ) is the same as the direction of the two sides of the first outer layer middle groove (44), the second outer layer side magnetic isolation groove (45) is arranged in the first outer layer middle groove (44) close to the sector area (20) At the two corners of one side of the arc edge, the magnetic isolation groove (45) in the side part of the second outer layer is in the shape of a trapezoid, and one of the waist edges of the trapezoid is communicated with the groove (44) in the middle part of the first outer layer. The shorter bottom side of the trapezoid is located on the side of the longer bottom side close to the arc side of the sector (20), and the bottom side of the trapezoid and the first outer layer middle groove (44) are located on one side of the arc side of the sector area (20) The included angle is an obtuse angle. 7. The permanent magnet synchronous motor rotor punching structure for compound electric motorcycles according to claim 4, wherein the outer layer groove body comprises a second outer layer middle groove (47) and a second outer layer groove (47) provided in the second outer layer. The second outer layer side grooves (48) on both sides of the middle groove (47), the second outer layer middle groove (47) is rectangular and symmetrically arranged at the centerline of the sector (20), the A third outer layer side magnetic isolation slot (49) is respectively provided on the two sides of the two outer layer middle slot (47) near one end of the arc edge of the sector (20), and the third outer layer side magnetic isolation slot (49) is triangular, one side of the third outer layer side magnetic isolation slot (49) communicates with the second outer layer middle slot (47), and the third outer layer side magnetic isolation slot (49) The included angle between this side and the side of the other two sides of the third outer layer side magnetic isolation groove (49) that is close to the arc edge of the sector (20) is an acute angle, and the second outer layer side groove (48) is in the shape of an acute angle. Triangular, and one side of the second outer layer side groove (48) close to the second outer layer middle groove (47) and the other two sides of the third outer layer side magnetic isolation groove (49) are close to the arc edge of the sector (20) The two sides are arranged parallel to each other, and there is a gap between the second outer layer side groove (48) and the third outer layer side magnetic isolation groove (49). 8. A permanent magnet synchronous motor rotor for a compound electric motorcycle, characterized in that it is composed of a plurality of punches having the permanent magnet synchronous motor rotor punching structure for a compound electric motorcycle according to any one of claims 1-7. Slices are superimposed.

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