A vehicle-mounted permanent magnet motor rotor punching sheet and its skewed pole structure

Abstract

The present invention discloses a rotor punching sheet for a vehicle permanent magnet motor and its skewed pole structure. The rotor punching sheet includes an inner punching sheet and an outer punching sheet. A shaft mounting hole for fixedly mounting a rotating shaft is provided at the center of the inner punching sheet. A plurality of shaft mating key grooves are provided on the side wall of the shaft mounting hole. A plurality of mating keys are provided on the outer wall of the inner punching sheet. Corresponding mating key grooves are provided on the inner wall of the outer punching sheet. The inner punching sheet and the outer punching sheet are fixedly connected by interference fit through the mating keys and the mating key grooves. A first set of magnet grooves are distributed in an inner layer in a circle on the outer punching sheet and an equal number of second set of magnet grooves are distributed in an outer layer in a circle. A direct-axis groove is provided on the outer wall of the outer punching sheet in the direct-axis direction, and a quadrature-axis groove is provided on the outer wall of the outer punching sheet in the quadrature-axis direction. The present invention adopts a combination form of an inner punching sheet and an outer punching sheet. The direct-axis groove and the quadrature-axis groove are provided on the outer wall of the outer punching sheet, which helps to reduce the torque ripple of the motor and reduce the electromagnetic force of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and particularly relates to a rotor punching sheet of a vehicle permanent magnet motor and its skewed pole structure. Background Art

[0002] A permanent magnet synchronous motor is a synchronous motor that generates a synchronous rotating magnetic field by permanent magnet excitation. Compared with an AC asynchronous motor, the permanent magnet synchronous motor has higher efficiency and smaller volume, and can better exert the advantages of energy conservation and emission reduction of new energy vehicles. Therefore, permanent magnet synchronous motors are often used in new energy vehicles. At present, the rotor punching sheet of a vehicle permanent magnet synchronous motor is generally of an integral design, and the skewed pole structure of the rotor is generally realized by using multiple rotor punching sheets, and the same skewed pole structure is relatively single, and the skewed pole structure method is fixed, generally one of "linear type" or "V type". Summary of the Invention

[0003] In view of the above existing technical problems, the present invention provides a rotor punching sheet of a vehicle permanent magnet motor and its skewed pole structure.

[0004] The technical solution of the present invention is as follows:

[0005] A rotor punching sheet of a vehicle permanent magnet motor includes an inner punching sheet and an outer punching sheet. A shaft mounting hole for fixedly mounting a rotating shaft is provided at the center of the inner punching sheet. A plurality of shaft fitting key grooves evenly distributed in the circumferential direction are provided on the side wall of the shaft mounting hole. At least one shaft fitting key extending along the axial direction of the rotating shaft is provided on the rotating shaft. The shaft fitting key and the shaft fitting key groove are in interference fit. A plurality of fitting keys are provided on the outer wall of the inner punching sheet, and corresponding fitting key grooves are provided on the inner wall of the outer punching sheet. The inner punching sheet and the outer punching sheet are fixedly connected by interference fit of the fitting keys and the fitting key grooves; a first set of magnet grooves distributed in an inner layer and an equal number of a second set of magnet grooves distributed in an outer layer are provided on the outer punching sheet. A direct-axis groove is provided on the outer wall of the outer punching sheet in the direct-axis direction, and a quadrature-axis groove is provided on the outer wall of the outer punching sheet in the quadrature-axis direction.

[0006] Preferably, the number of the direct-axis grooves is equal to the number of poles of the motor, the number of the quadrature-axis grooves is also equal to the number of poles of the motor, and the direct-axis grooves and the quadrature-axis grooves are alternately arranged.

[0007] Preferably, the first set of magnet grooves are distributed in pairs in a "V" shape, and the two paired first set of magnet grooves are symmetrically distributed along the radial direction of the outer punching sheet.

[0008] Preferably, the second set of magnet grooves are distributed in pairs in a "linear" shape, and the two paired second set of magnet grooves are symmetrically distributed along the radial direction of the outer punching sheet.

[0009] Preferably, the gap between the bottoms of the two paired first magnet slots is a first magnetic isolation bridge, the width of the first magnetic isolation bridge is 1-2 mm, the gap between the two paired second magnet slots is a second magnetic isolation bridge, and the width of the second magnetic isolation bridge is 0.7-1.2 mm.

[0010] Preferably, the direct-axis groove is an arc-shaped groove, and the radius of the direct-axis groove is 1.1-1.5 times the width of the first magnetic isolation bridge.

[0011] Preferably, the quadrature-axis groove is an arc-shaped groove, and the radius of the quadrature-axis groove is 1.1-1.5 times the width of the second magnetic isolation bridge.

[0012] Preferably, the outer punching sheet is made of silicon steel material, and the inner punching sheet is made of aluminum material.

[0013] A skewed pole structure of a vehicle permanent magnet motor uses the above-mentioned vehicle permanent magnet motor rotor punching sheet, and includes a rotating shaft and a plurality of vehicle permanent magnet motor rotor punching sheets sleeved on the rotating shaft through the rotating shaft mounting holes. The rotating shaft is in interference fit with a plurality of rotating shaft mating key grooves at different angles on the inner punching sheet through a mating key to achieve a multi-segment skewed pole of the rotor in the form of "one-word", "V-shaped" or "ZigZag-shaped".

[0014] Preferably, the number of the rotating shaft mating key grooves is greater than or equal to the number of segments of the multi-segment skewed pole of the rotor.

[0015] The beneficial effects of the present invention are as follows:

[0016] The rotor punching sheet of the present invention adopts a combined form of an inner punching sheet and an outer punching sheet. The outer wall of the outer punching sheet is provided with a direct-axis groove and a quadrature-axis groove, which helps to reduce the torque ripple of the motor and reduce the electromagnetic force of the motor; the second magnet slot in the present invention is distributed in pairs in the form of "one-word", and this two-segment one-word structure is different from the existing integral one-word structure, which can effectively reduce the generation of magnetic field leakage flux, improve the material utilization rate of the permanent magnet, and reduce costs; the outer punching sheet of the present invention adopts a silicon steel material with high magnetic permeability, and the inner punching sheet adopts a high-hardness aluminum material with low magnetic permeability. The outer punching sheet helps to ensure that the main magnetic flux of the permanent magnet magnetic field will not weaken and ensure the output performance of the motor. The aluminum material used for the inner punching sheet has a lower density, which greatly reduces the overall weight of the rotor, ensures the strength of the rotor, reduces the generation of magnetic field leakage flux of the permanent magnet, and improves the power density of the motor; the present invention can achieve a skewed pole structure with different skewed pole angles through the interference fit between the rotating shaft mating key and a plurality of rotating shaft mating key grooves at different angles on the inner punching sheet, such as a multi-segment skewed pole of the rotor in the form of "one-word", "V-shaped" or "ZigZag-shaped". Description of the Drawings

[0017] The present invention will be further described below with reference to the drawings and embodiments:

[0018] Figure 1 It is a schematic structural diagram of the rotor punching sheet of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the outer punching sheet of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the inner punching sheet of the present invention;

[0021] Figure 4 It is a schematic structural diagram of the rotating shaft of the present invention;

[0022] Figure 5 It is an assembly schematic diagram of a single rotor punching sheet and the rotating shaft of the present invention;

[0023] Figure 6 It is a schematic diagram of the skewed pole structure of the present invention.

[0024] In the figure, the markings are: 1, inner punching sheet; 11, rotating shaft mounting hole; 12, rotating shaft mating keyway; 13, mating key; 2, outer punching sheet; 21, mating keyway; 22, first magnet slot; 23, second magnet slot; 24, direct-axis groove; 25, quadrature-axis groove; 26, first magnetic isolation bridge; 27, second magnetic isolation bridge; 3, rotating shaft; 31, rotating shaft mating key. Specific Embodiments

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0026] As Figures 1 to 5 shown, a permanent magnet motor rotor punching sheet for a vehicle includes an inner punching sheet 1 and an outer punching sheet 2. A rotating shaft mounting hole 11 for fixedly mounting a rotating shaft 3 is provided at the center of the inner punching sheet 1. A plurality of axially circumferentially uniformly distributed rotating shaft mating keyways 12 are provided on the side wall of the rotating shaft mounting hole 11. At least one rotating shaft mating key 31 extending along the axial direction of the rotating shaft 3 is provided on the rotating shaft 3. The rotating shaft mating key 31 and the rotating shaft mating keyway 12 are in interference fit. A plurality of mating keys 13 are provided on the outer wall of the inner punching sheet 1. Corresponding mating keyways are provided on the inner wall of the outer punching sheet 2. The inner punching sheet 1 and the outer punching sheet 2 are fixedly connected by interference fit of the mating key 13 and the mating keyway.

[0027] On the outer punching sheet 2, there is a first magnet groove 22 distributed in an inner layer in a circle and an equal number of second magnet grooves 23 distributed in an outer layer in a circle. The first magnet grooves 22 are distributed in pairs in a "V" shape, and the second magnet grooves 23 are distributed in pairs in a "one - character" shape. The two paired first magnet grooves 22 are symmetrically distributed along the radial direction of the outer punching sheet 2. The gap between the bottoms of the two paired first magnet grooves 22 is the first magnetic isolation bridge 26, and the width of the first magnetic isolation bridge 26 is 1 - 2 mm. The two paired second magnet grooves 23 are symmetrically distributed along the radial direction of the outer punching sheet 2. The gap between the two paired second magnet grooves 23 is the second magnetic isolation bridge 27, and the width of the second magnetic isolation bridge 27 is 0.7 - 1.2 mm. This two - section one - character structure is different from the existing integral one - character structure, which can effectively reduce the generation of magnetic field leakage flux, improve the material utilization rate of the permanent magnet, and reduce costs. In addition, on the outer wall of the outer punching sheet 2 in the direct axis direction, there is a direct axis groove 24, and on the outer wall of the outer punching sheet 2 in the quadrature axis direction, there is a quadrature axis groove 25. The number of direct axis grooves 24 is equal to the number of motor poles, and the number of quadrature axis grooves 25 is also equal to the number of motor poles, and the direct axis grooves 24 and the quadrature axis grooves 25 are arranged alternately. Both the direct axis grooves 24 and the quadrature axis grooves 25 are arc - shaped grooves. The radius of the direct axis grooves 24 is 1.1 - 1.5 times the width of the first magnetic isolation bridge 26, and the radius of the quadrature axis grooves 25 is 1.1 - 1.5 times the width of the second magnetic isolation bridge 27. The settings of the direct axis grooves 24 and the quadrature axis grooves 25 help to reduce the motor torque ripple and reduce the motor electromagnetic force.

[0028] The outer punching sheet 2 is made of silicon steel material with high magnetic permeability, and the inner punching sheet 1 is made of high - hardness aluminum - type material with low magnetic permeability. Among them, the outer punching sheet 2 helps to ensure that the main magnetic flux of the permanent magnet magnetic field will not weaken, ensuring the output performance of the motor. The aluminum material used for the inner punching sheet 1 has a lower density, which greatly reduces the overall weight of the rotor, ensures the rotor strength, reduces the generation of magnetic field leakage flux of the permanent magnet, and improves the motor power density.

[0029] As Figure 6 shown, a skewed - pole structure of a vehicle - used permanent - magnet motor adopts the above - mentioned vehicle - used permanent - magnet motor rotor punching sheet, including a rotating shaft 3 and 7 vehicle - used permanent - magnet motor rotor punching sheets sleeved on the rotating shaft 3 through the rotating - shaft mounting holes 11. The number of rotating - shaft mating keyways 12 is greater than or equal to the number of segments of the multi - segment skewed pole of the rotor. The included angle between the radial symmetry lines of two adjacent rotating - shaft mating keyways 12 is determined by the rotor segment skewed - pole angle. The rotating - shaft mating key 31 is in interference fit with multiple rotating - shaft mating keyways 12 with different angles on the inner punching sheet 1 to achieve skewed - pole structures with different skewed - pole angles, such as a "V - type" multi - segment skewed pole of the rotor, or a "one - character" or "ZigZag - type" multi - segment skewed pole of the rotor.

[0030] It should be understood that the above specific embodiments of the present invention are only for illustrative or explanatory purposes of the principles of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A rotor punching sheet for a vehicle permanent magnet motor, characterized in that, it includes an inner punching sheet and an outer punching sheet. The outer punching sheet is made of silicon steel material, and the inner punching sheet is made of aluminum material. A shaft installation hole for fixedly installing a rotating shaft is provided at the center of the inner punching sheet. A plurality of shaft mating key grooves evenly distributed in the circumferential direction are provided on the side wall of the shaft installation hole. At least one shaft mating key extending along the axial direction of the rotating shaft is provided on the rotating shaft. The shaft mating key and the shaft mating key groove are in interference fit. A plurality of mating keys are provided on the outer wall of the inner punching sheet, and corresponding mating key grooves are provided on the inner wall of the outer punching sheet. The inner punching sheet and the outer punching sheet are fixedly connected through interference fit of the mating keys and the mating key grooves; A first magnet groove distributed in an inner layer circle and an equal number of second magnet grooves distributed in an outer layer circle are provided on the outer punching sheet. A direct-axis groove is provided on the outer wall of the outer punching sheet in the direct-axis direction, and a quadrature-axis groove is provided on the outer wall of the outer punching sheet in the quadrature-axis direction; The number of the direct-axis grooves is equal to the number of motor poles, the number of the quadrature-axis grooves is also equal to the number of motor poles, and the direct-axis grooves and the quadrature-axis grooves are arranged alternately.

2. A rotor punching sheet for a vehicle permanent magnet motor according to claim 1, characterized in that, the first magnet grooves are distributed in pairs in a "V" shape, and the two paired first magnet grooves are symmetrically distributed along the radial direction of the outer punching sheet.

3. A rotor punching sheet for a vehicle permanent magnet motor according to claim 2, characterized in that, the second magnet grooves are distributed in pairs in a "one-word" shape, and the two paired second magnet grooves are symmetrically distributed along the radial direction of the outer punching sheet.

4. A rotor punching sheet for a vehicle permanent magnet motor according to claim 3, characterized in that, the gap between the bottoms of the two paired first magnet grooves is a first magnetic isolation bridge, the width of the first magnetic isolation bridge is 1-2 mm, the gap between the two paired second magnet grooves is a second magnetic isolation bridge, and the width of the second magnetic isolation bridge is 0.7-1.2 mm.

5. A rotor punching sheet for a vehicle permanent magnet motor according to claim 4, characterized in that, the direct-axis groove is an arc-shaped groove, and the radius of the direct-axis groove is 1.1-1.5 times the width of the first magnetic isolation bridge.

6. A rotor punching sheet for a vehicle permanent magnet motor according to claim 4, characterized in that, the quadrature-axis groove is an arc-shaped groove, and the radius of the quadrature-axis groove is 1.1-1.5 times the width of the second magnetic isolation bridge.

7. A skewed pole structure for a vehicle permanent magnet motor, characterized in that, it adopts the rotor punching sheet for a vehicle permanent magnet motor according to any one of claims 1-6, and includes a rotating shaft and a plurality of rotor punching sheets for a vehicle permanent magnet motor sleeved on the rotating shaft through the shaft installation holes. The shaft mating key and the shaft mating key grooves at multiple different angles on the inner punching sheet are in interference fit to realize a multi-segment skewed pole of the rotor in a "one-word", "V" or "ZigZag" shape.

8. A skewed pole structure for a vehicle permanent magnet motor according to claim 7, characterized in that, the number of the shaft mating key grooves is greater than or equal to the number of segments of the multi-segment skewed pole of the rotor.

Images