Rotor punching sheet, rotor structure and motor

Abstract

The present disclosure provides a rotor punching sheet, a rotor structure and an electric motor. The rotor punching sheet includes: a punching sheet body, on which a V-shaped magnet groove is provided, and the opening of the V shape faces the outer edge of the punching sheet body; first air grooves are provided at two ends of the V-shaped magnet groove close to the outer edge of the punching sheet body, and the punching sheet body between the first air grooves and the outer edge of the punching sheet body forms a first magnetic isolation bridge. The rotor punching sheet of the present disclosure has a V-shaped topological structure, and by providing first air grooves on the V-shaped magnet groove to form a first magnetic isolation bridge, it can effectively prevent magnetic leakage, improve the permanent magnet torque of the electric motor, ensure the output torque of the electric motor, improve the torque utilization rate of the electric motor, reduce magnetic leakage, improve the anti-demagnetization ability, and has the advantages of high permanent magnet utilization rate, small torque ripple, low harmonic content and high efficiency.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of motors, and particularly relates to a rotor punching sheet, a rotor structure and a motor. Background Art

[0002] As people pay increasing attention to environmental protection and efficient energy utilization, new energy vehicles have become an important part of the automotive industry. As a key link in the energy conversion of new energy vehicles, the drive motor has a great impact on new energy vehicles. Permanent magnet synchronous motors are widely used in pure electric or hybrid new energy vehicles due to their advantages such as large torque density, high efficiency, good steady-state performance, and high reliability. A permanent magnet synchronous motor mainly consists of an external housing and structures such as a stator and a rotor inside the housing. When developing a motor, it is necessary to consider the motor torque ripple and harmonic content, which causes NVH (Noise, Vibration, Harshness) problems. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present disclosure is that there is a large torque ripple and harmonic content during the use of the motor, and thus a rotor punching sheet, a rotor structure and a motor are provided.

[0004] To solve the above problems, the present disclosure provides a rotor punching sheet, including:

[0005] A punching sheet body, on which a V-shaped magnet groove is provided, and the opening of the V shape faces the outer edge of the punching sheet body;

[0006] At both ends of the V-shaped magnet groove close to the outer edge of the punching sheet body, a first air groove is provided, and the punching sheet body between the first air groove and the outer edge of the punching sheet body forms a first magnetic isolation bridge.

[0007] The object of the present disclosure and the technical problems to be solved can be further achieved by the following technical measures.

[0008] In some embodiments, the dimension s1 of the first magnetic isolation bridge in the circumferential direction of the punching sheet body is 4.1 mm - 4.5 mm, and / or, the dimension s2 of the first magnetic isolation bridge in the radial direction of the punching sheet body is 1.15 mm - 1.25 mm.

[0009] In some embodiments, the included angle c between the side of the first air groove close to the outer edge of the punching sheet body and the side close to the inner side of the V-shaped magnet groove is 108° - 114°.

[0010] In some embodiments, c is 108.45°.

[0011] In some embodiments, a third magnet groove is further provided inside the opening of the V-shaped magnet groove, and the third magnet groove is perpendicular to the radial direction of the punching sheet body.

[0012] In some embodiments, third air grooves are respectively provided at both circumferential ends of the third magnet groove along the lamination core body, and the lamination core body between the third air grooves and the outer edge of the lamination forms a second magnetic isolation bridge.

[0013] In some embodiments, the side of the third air groove at one end of the third magnet groove away from the third magnet groove is the first side, and the side of the third air groove at the other end of the third magnet groove away from the third magnet groove is the second side. The included angle a between the first side and the second side is 48° - 52°.

[0014] In some embodiments, a is 50°.

[0015] In some embodiments, the side of the third air groove close to the outer edge of the lamination core body and the side of the third magnet groove close to the outer edge of the lamination core body are on the same chord line of the lamination core body.

[0016] In some embodiments, the V-shaped magnet groove includes a first magnet groove and a second magnet groove arranged in a V shape. Second air grooves are provided at the ends of the first magnet groove and the second magnet groove close to each other, and the lamination core body between the second air groove of the first magnet groove and the second air groove of the second magnet groove forms a third magnetic isolation bridge.

[0017] In some embodiments, the dimension s3 of the third magnetic isolation bridge along the radial direction of the lamination core body is 5.1 mm - 5.3 mm, and the dimension s4 of the third magnetic isolation bridge along the circumferential direction of the lamination core body is s4 = (0.27 - 0.3) × s3.

[0018] In some embodiments, s4 = 0.288 × s3.

[0019] In some embodiments, a first magnet is arranged in the first magnet groove, a second magnet is arranged in the second magnet groove, and a third magnet is arranged in the third magnet groove. The thickness of the first magnet and the second magnet is L1, and the thickness of the third magnet is L2. The included angle b between the first magnet groove and the second magnet groove is b = L1 / L2 * (53.5 - 56.2).

[0020] In some embodiments, b = 96°.

[0021] In some embodiments, the thickness L1 of the first magnet and the second magnet is 6.5 mm - 7.5 mm, and the thickness L2 of the third magnet is 3.8 mm - 4.2 mm.

[0022] In some embodiments, the intersection point of the extension lines of the sides of the first magnet and the second magnet located on the inner side of the V shape is Q, and the perpendicular distance h1 from the intersection point Q to the third magnet satisfies h1 / L2 = 3.5 - 3.9.

[0023] In some embodiments, an avoidance groove is provided in the V-shaped magnet groove and is arranged on the inner wall of the V-shaped magnet groove close to the V-shaped outer side.

[0024] A rotor structure using the above-mentioned rotor punching sheet.

[0025] An electric motor using the above-mentioned rotor punching sheet.

[0026] The rotor punching sheet, rotor structure and electric motor provided by the present disclosure at least have the following beneficial effects:

[0027] The rotor punching sheet of the present disclosure has a V-shaped topological structure, and by arranging a first air groove on the V-shaped magnet groove to form a first magnetic isolation bridge, it can effectively prevent magnetic leakage, improve the permanent magnet torque of the electric motor, ensure the output torque of the electric motor, improve the torque utilization rate of the electric motor, improve the anti-demagnetization ability, and has the advantages of high permanent magnet utilization rate, small torque ripple, low harmonic content and high efficiency. Description of the Drawings

[0028] Figure 1 Structural schematic diagram of the rotor punching sheet of the embodiment of the present disclosure Figure 1 ;

[0029] Figure 2 Structural schematic diagram of the rotor punching sheet of the embodiment of the present disclosure Figure 2 ;

[0030] Figure 3 Structural schematic diagram of the rotor punching sheet of the embodiment of the present disclosure Figure 3 ;

[0031] Figure 4 Partial structural schematic diagram of the avoidance groove of the embodiment of the present disclosure.

[0032] The reference signs are shown as:

[0033] 1. Punching sheet body; 21. First air groove; 22. Second air groove; 23. Third air groove; 31. First magnet groove; 32. Second magnet groove; 33. Third magnet groove; 34. Avoidance groove; 41. First magnetic isolation bridge; 42. Second magnetic isolation bridge; 43. Third magnetic isolation bridge; A. First magnet; B. Second magnet; C. Third magnet. Detailed Embodiments

[0034] To make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be clearly and completely described below in conjunction with specific embodiments of the present disclosure and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without making creative efforts belong to the scope of protection of the present disclosure.

[0035] In combination with Figures 1 to 4As shown in the figure, an embodiment of the present disclosure provides a rotor punching sheet, including: a punching sheet body 1, on which a V-shaped magnet groove is provided, and the opening of the V shape faces the outer edge of the punching sheet body 1; both ends of the V-shaped magnet groove close to the outer edge of the punching sheet body 1 are provided with first air grooves 21, and the punching sheet body 1 between the first air grooves 21 and the outer edge of the punching sheet body 1 forms a first magnetic isolation bridge 41.

[0036] The rotor punching sheet of the present disclosure has a V-shaped topological structure, and by providing the first air grooves 21 on the V-shaped magnet groove to form the first magnetic isolation bridge 41, it can effectively prevent magnetic leakage, improve the permanent magnet torque of the motor, ensure the output torque of the motor, and improve the mechanical strength of the motor rotor. It can improve the torque utilization rate of the motor, improve the anti-demagnetization ability, and has the advantages of high permanent magnet utilization rate, small torque ripple, low harmonic content, and high efficiency.

[0037] In some embodiments, the dimension s1 of the first magnetic isolation bridge 41 in the circumferential direction of the punching sheet body 1 is 4.1 mm - 4.5 mm, and / or the dimension s2 of the first magnetic isolation bridge 41 in the radial direction of the punching sheet body 1 is 1.15 mm - 1.25 mm. When the first magnetic isolation bridge 41 meets the above dimension requirements, magnetic leakage can be minimized to the greatest extent, the permanent magnet torque of the motor can be ensured, and the output capacity of the motor can be improved.

[0038] In some embodiments, the included angle c between the side of the first air groove 21 close to the outer edge of the punching sheet body 1 and the side close to the inner side of the V-shaped magnet groove is 108° - 114°, and the included angle c is connected by an arc transition. Preferably, c is 108.45°. The included angle c can reduce the harmonic content of the motor and reduce the torque ripple of the motor.

[0039] In some embodiments, a third magnet groove 33 is further provided inside the opening of the V-shaped magnet groove, and the third magnet groove 33 is perpendicular to the radial direction of the punching sheet body 1. A third magnet C can be arranged in the third magnet groove 33, so that the rotor punching sheet of this embodiment is composed of a combination of a V-type and a I-type topological structures, further improving the torque utilization rate of the motor, reducing the torque ripple and harmonic content.

[0040] In some embodiments, third air grooves 23 are respectively provided at both ends of the third magnet groove 33 in the circumferential direction of the punching sheet body 1, and the punching sheet body 1 between the third air grooves 23 and the outer edge of the punching sheet forms a second magnetic isolation bridge 42. The second magnetic isolation bridge 42 can effectively prevent magnetic leakage, improve the permanent magnet torque of the motor, ensure the output torque of the motor, and can also reduce the stress on the first magnetic isolation bridge 41, improving the mechanical strength of the motor rotor.

[0041] In some embodiments, the side of the third air groove 23 at one end of the third magnet groove 33, which is away from the third magnet groove 33, is the first side, and the side of the third air groove 23 at the other end of the third magnet groove 33, which is away from the third magnet groove 33, is the second side. The included angle a between the first side and the second side is 48° - 52°. Preferably, a is 50°. The included angle a can reduce the harmonic content of the motor and reduce the torque ripple of the motor.

[0042] In some embodiments, the side of the third air groove 23 close to the outer edge of the punching sheet body 1 and the side of the third magnet groove 33 close to the outer edge of the punching sheet body 1 are on the same chord line of the punching sheet body 1, thereby further reducing the harmonic content of the motor and reducing the torque ripple of the motor.

[0043] In some embodiments, the V-shaped magnet groove includes a first magnet groove 31 and a second magnet groove 32 arranged in a V shape. Second air grooves 22 are provided at the ends of the first magnet groove 31 and the second magnet groove 32 close to each other. A third magnetic isolation bridge 43 is formed on the punching sheet body 1 between the second air groove 22 of the first magnet groove 31 and the second air groove 22 of the second magnet groove 32. The third magnetic isolation bridge 43 can effectively prevent magnetic leakage, improve the permanent magnet torque of the motor, and ensure the output torque of the motor.

[0044] In some embodiments, the dimension s3 of the third magnetic isolation bridge 43 along the radial direction of the punching sheet body 1 is 5.1 mm - 5.3 mm, and the dimension s4 of the third magnetic isolation bridge 43 along the circumferential direction of the punching sheet body 1 is s4 = (0.27 - 0.3) × s3. Preferably, s4 = 0.288 × s3. When the third magnetic isolation bridge 43 meets the above dimension requirements, the effect of preventing magnetic leakage and improving the permanent magnet torque of the third magnetic isolation bridge 43 is the best.

[0045] In some embodiments, a first magnet A is arranged in the first magnet groove 31, a second magnet B is arranged in the second magnet groove 32, and a third magnet C is arranged in the third magnet groove 33. The thickness of the first magnet A and the second magnet B is L1, and the thickness of the third magnet C is L2. The included angle b between the first magnet groove 31 and the second magnet groove 32 is b = L1 / L2 * (53.5 - 56.2). Preferably, b = 96°. The included angle b can reduce the harmonic content of the motor, reduce the torque ripple of the motor, reduce motor vibration, reduce motor noise, ensure the output torque of the motor, and improve the performance of the motor.

[0046] In some embodiments, the thickness L1 of the first magnet A and the second magnet B is 6.5 mm - 7.5 mm, and the thickness L2 of the third magnet C is 3.8 mm - 4.2 mm. When using magnets that meet the above dimension requirements, the permanent magnet utilization rate of the rotor punching sheet of the present disclosure is high, the torque ripple is small, the harmonic content is low, and the efficiency is high.

[0047] In some embodiments, the intersection point of the extension lines of the sides of the first magnet A and the second magnet B located inside the V shape is Q, and the perpendicular distance h1 from the intersection point Q to the third magnet C satisfies h1 / L2 = 3.5 - 3.9. When the ratio of h1 to L1 satisfies the above range, this embodiment can effectively reduce the harmonic content of the motor, reduce the torque ripple of the motor, and improve the motor performance.

[0048] In some embodiments, a relief groove 34 is provided in the V-shaped magnet groove, and the relief groove 34 is provided on the inner wall of the V-shaped magnet groove close to the V-shaped outer side. The shape of the relief groove 34 is eyebrow-shaped or arc-shaped. The relief groove 34 can enhance the demagnetization resistance of the magnet, prevent irreversible demagnetization of the motor under high-current and high-temperature conditions, and the relief groove 34 can reduce the chamfer of the magnet, enabling the magnet to be smoothly inserted into the magnet groove even without chamfering.

[0049] The present disclosure discloses a rotor topology with low harmonics and low torque ripple through the air groove design, magnetic isolation bridge design, rotor pole design, and magnet groove design of the stator and rotor punching sheets of the motor, and gives constraints on the key dimensions of the rotor topology. This topology can reduce the harmonic content and torque ripple of the motor, thereby reducing the rotor loss, increasing the output torque of the motor, and generally improving the motor efficiency.

[0050] A rotor structure adopts the above-mentioned rotor punching sheet.

[0051] A motor adopts the above-mentioned rotor punching sheet.

[0052] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0053] The above are only the preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure. The above is only the preferred implementation manner of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present disclosure, several improvements and variations can be made, and these improvements and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. A rotor punching sheet, characterized in that, Including: A punching sheet body (1), on which a V-shaped magnet groove is provided, and the opening of the V shape faces the outer edge of the punching sheet body (1); Both ends of the V-shaped magnet groove close to the outer edge of the punching sheet body (1) are provided with first air grooves (21), and the punching sheet body (1) between the first air grooves (21) and the outer edge of the punching sheet body (1) forms a first magnetic isolation bridge (41); A third magnet groove (33) is further provided inside the opening of the V-shaped magnet groove, and the third magnet groove (33) is perpendicular to the radial direction of the punching sheet body (1); The V-shaped magnet groove includes a first magnet groove (31) and a second magnet groove (32) arranged in a V shape. Second air grooves (22) are provided at the ends where the first magnet groove (31) and the second magnet groove (32) are close to each other. The punching sheet body (1) between the second air groove (22) of the first magnet groove (31) and the second air groove (22) of the second magnet groove (32) forms a third magnetic isolation bridge (43); A first magnet (A) is arranged in the first magnet groove (31), a second magnet (B) is arranged in the second magnet groove (32), a third magnet (C) is arranged in the third magnet groove (33). The thickness of the first magnet (A) and the second magnet (B) is L1, the thickness of the third magnet (C) is L2, and the included angle b between the first magnet groove (31) and the second magnet groove (32) is b = L1 / L2*(53.5 - 56.2); The thickness L1 of the first magnet (A) and the second magnet (B) is 6.5 mm - 7.5 mm, and the thickness L2 of the third magnet (C) is 3.8 mm - 4.2 mm.

2. The rotor punching sheet according to claim 1, characterized in that The dimension s1 of the first magnetic isolation bridge (41) in the circumferential direction of the punching sheet body (1) is 4.1 mm - 4.5 mm, and / or the dimension s2 of the first magnetic isolation bridge (41) in the radial direction of the punching sheet body (1) is 1.15 mm - 1.25 mm.

3. The rotor punching sheet according to claim 1, wherein The included angle c between the side of the first air groove (21) close to the outer edge of the punching sheet body (1) and the side close to the inner side of the V-shaped magnet groove is 108° - 114°.

4. The rotor punching sheet according to claim 3, wherein, c is 108.45°.

5. The rotor punching sheet according to claim 1, wherein Third air grooves (23) are respectively provided at both ends of the third magnet groove (33) along the circumferential direction of the punching sheet body (1), and the punching sheet body (1) between the third air grooves (23) and the outer edge of the punching sheet forms a second magnetic isolation bridge (42).

6. The rotor punching sheet according to claim 5, wherein, The side of the third air groove (23) at one end of the third magnet groove (33) far from the third magnet groove (33) is the first side, the side of the third air groove (23) at the other end of the third magnet groove (33) far from the third magnet groove (33) is the second side, and the included angle a between the first side and the second side is 48° - 52°.

7. The rotor punching sheet according to claim 6, wherein a is 50°.

8. The rotor punching sheet according to claim 5, wherein The side of the third air groove (23) close to the outer edge of the punching sheet body (1) and the side of the third magnet groove (33) close to the outer edge of the punching sheet body (1) are on the same chord line of the punching sheet body (1).

9. The rotor punching sheet according to claim 8, characterized in that, The dimension s3 of the third magnetic isolation bridge (43) along the radial direction of the punching sheet body (1) is 5.1 mm - 5.3 mm, and the dimension s4 of the third magnetic isolation bridge (43) along the circumferential direction of the punching sheet body (1) is s4 = (0.27 - 0.3) × s3.

10. The rotor punching sheet according to claim 9, characterized in that, s4 = 0.288 × s3.

11. The rotor punching sheet according to claim 1, wherein, b＝96°。 12. The rotor punching sheet according to claim 1, wherein, The intersection point of the extension lines of the sides of the first permanent magnet (A) and the second permanent magnet (B) located inside the V shape is Q, and the perpendicular distance h1 from the intersection point Q to the third permanent magnet satisfies h1 / L2 = 3.5 - 3.

9.

13. The rotor punching sheet according to any one of claims 1-12, characterized in that, An avoidance groove (34) is provided in the V-shaped permanent magnet groove, and the avoidance groove (34) is arranged on the inner wall of the V-shaped permanent magnet groove close to the V-shaped outer side.

14. A rotor structure, characterized in that, The rotor punching sheet according to any one of claims 1 - 12 is adopted.

15. A motor, characterized in that, The rotor punching sheet according to any one of claims 1 - 12 is adopted.

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