Rotor for a permanent magnet synchronous motor

Abstract

The utility model relates to motor rotor technical field, specifically disclose a rotor for permanent magnet synchronous motor, including the pivot, permanent magnet piece and rotor iron core, permanent magnet piece is fixed in the outside of rotor iron core through the support fixing frame or plastic package piece of non -magnetic conduction, the utility model cancels the magnetic bridge of traditional magnetic conduction material, and the permanent magnet piece is supported and fixed with non -magnetic conduction material, can solve the problem of IPM's magnetic leakage for the pertinence, makes motor output performance realizes the substantial promotion on the original IPM foundation.

Description

Technical Field

[0001] This utility model relates to the field of motor rotor technology, specifically to a rotor for a permanent magnet synchronous motor. Background Technology

[0002] Permanent magnet motors have high torque density and high efficiency, and have been widely used in medical devices, home appliances, electric vehicles, wind power generation and aerospace.

[0003] In permanent magnet synchronous motor rotor technology, among related technologies, embedded (IPM) rotors have reached a bottleneck in improving performance such as torque density and high-speed stability due to structural limitations, such as magnetic bridge leakage and insufficient mechanical strength. Although surface-mounted (SPM) rotors are superior to IPMs in terms of efficiency and low loss, they require complex magnetic material processing and process adaptation in high-speed and high-power scenarios, resulting in higher costs. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a rotor for a permanent magnet synchronous motor. It eliminates the magnetic bridge made of traditional magnetic materials and replaces it with non-magnetic materials to support and fix the permanent magnet sheets. This can specifically solve the problem of magnetic leakage in IPMs and significantly improve the output performance of the motor compared to the original IPM.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A rotor for a permanent magnet synchronous motor includes a shaft, permanent magnet plates, and a rotor core. The permanent magnet plates are fixed to the outside of the rotor core by a non-magnetic support bracket or a plastic seal.

[0007] Preferably, the rotor core is made of several thin sheets of soft magnetic material stacked together, and the rotor core is mounted on the rotating shaft.

[0008] Preferably, there are several permanent magnet sheets arranged in a circle around the rotor core.

[0009] Preferably, the support frame is made of plastic material.

[0010] Preferably, the support frame is made by injection molding.

[0011] Preferably, the support frame includes an upper fixing frame and a lower fixing frame, which are respectively disposed at the upper and lower ends of the rotor core. Positioning holes are provided at both ends of the rotor core. The side of the upper fixing frame facing the rotor core is provided with several upper positioning posts, and the side of the lower fixing frame facing the rotor core is provided with several lower positioning posts. The upper and lower positioning posts are inserted into the positioning holes so that the upper and lower fixing frames are installed on the rotor core.

[0012] Preferably, the rotor core has several mounting positions corresponding to the permanent magnet pieces, and slots are provided between adjacent mounting positions. The upper fixing frame has several upper fixing plates corresponding to the mounting positions and several upper insertion blocks corresponding to the slots. The lower fixing frame has several lower fixing plates corresponding to the mounting positions and several lower insertion blocks corresponding to the slots. The permanent magnet pieces are mounted on the mounting positions. The upper and lower insertion blocks are inserted into the slots from the upper and lower ends, respectively. The upper fixing plates and lower fixing plates are mounted on the upper and lower ends of the outer side of the permanent magnet pieces, so that the permanent magnet pieces are fixed on the mounting positions.

[0013] Preferably, the support frame is a carbon fiber sheath.

[0014] Preferably, the support frame fixes the permanent magnet sheet to the rotor core through a winding process.

[0015] Preferably, the permanent magnet sheet is rectangular.

[0016] The beneficial effects of this utility model are as follows: This product includes a rotating shaft, permanent magnet sheets and a rotor core. The permanent magnet sheets are fixed to the outside of the rotor core by a non-magnetic support bracket or a plastic seal. The magnetic bridge of the traditional magnetic material is eliminated, and the permanent magnet sheets are supported and fixed by a non-magnetic material. This can specifically solve the problem of magnetic leakage of IPM, and the output performance of the motor can be greatly improved on the basis of the original IPM. Attached Figure Description

[0017] Figure 1 : This is a structural schematic diagram of an embodiment of the present utility model;

[0018] Figure 2 This is an exploded structural diagram of an embodiment of the present invention;

[0019] Figure 3 This is an exploded view of an embodiment of the present invention from below.

[0020] Explanation of the symbols in the attached diagram: 10-rotating shaft, 11-permanent magnet sheet, 12-rotor core, 13-positioning hole, 14-mounting position, 15-slot, 20-support bracket, 21-upper bracket, 22-lower bracket, 23-upper positioning post, 24-lower positioning post, 25-upper fixing plate, 26-lower fixing plate, 27-upper insert block, 28-lower insert block. Detailed Implementation

[0021] To more clearly illustrate the structural features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments:

[0022] This embodiment: as follows Figure 1-3As shown, a rotor for a permanent magnet synchronous motor includes a shaft 10, permanent magnet plates 11, a rotor core 12, and a non-magnetic support frame 20. The rotor core 12 is made of several thin sheets of soft magnetic material stacked together. The rotor core 12 is mounted on the shaft 10. The permanent magnet plates 11 are cuboid in shape. The cuboid design makes the permanent magnet plates 11 more versatile and reduces manufacturing costs. The permanent magnet plates 11 are fixed to the outside of the rotor core 12 by the support frame 20. There are eight permanent magnet plates 11, which are arranged in a circle around the shaft 10 on the outside of the rotor core 12.

[0023] The support frame 20 is made of injection-molded plastic material. As a non-magnetic and low-conductivity material, plastic can minimize interference with the permanent magnet field. At the same time, the density of injection-molded plastic material is much lower than that of metal, which can reduce the overall mass of the rotor, thereby reducing the moment of inertia, shortening the acceleration time of the motor, and making the dynamic response faster. Moreover, the damping coefficient of plastic material is higher than that of metal, which can absorb the high-frequency vibration during rotor rotation, reduce the transmission of vibration to the housing, thereby reducing operating noise and improving the quietness of the motor.

[0024] The support frame 20 includes an upper frame 21 and a lower frame 22. The upper frame 21 and the lower frame 22 are respectively disposed at the upper and lower ends of the rotor core 12. Each of the upper and lower ends of the rotor core 12 is provided with four positioning holes 13. The side of the upper frame 21 facing the rotor core 12 is provided with four upper positioning posts 23, and the side of the lower frame 22 facing the rotor core 12 is provided with four lower positioning posts 24. The upper positioning posts 23 and the lower positioning posts 24 are inserted into the positioning holes 13, so that the upper frame 21 and the lower frame 22 are installed on the rotor core 12. By setting the upper positioning posts 23, the lower positioning posts 24 and the positioning holes 13, the spatial position of all components is strictly symmetrical, avoiding unbalanced vibration caused by the shift of the center of gravity when the rotor rotates, reducing bearing wear and extending the motor life.

[0025] The rotor core 12 has eight mounting positions 14 corresponding to the permanent magnet plates 11, and slots 15 are provided between adjacent mounting positions 14. The upper fixing frame 21 has eight upper fixing plates 25 corresponding to the mounting positions 14, and several upper insertion blocks 27 corresponding to the slots 15. The lower fixing frame 22 has eight lower fixing plates 26 corresponding to the mounting positions 14, and several lower insertion blocks 28 corresponding to the slots 15. The permanent magnet plates 11 are mounted on the mounting positions 14. The upper insertion blocks 27 and lower insertion blocks 28 are inserted into the slots 15 from the upper and lower ends, respectively. The upper fixing plates 25 and lower fixing plates 26 are mounted on the upper and lower ends of the outer side of the permanent magnet plates 11, so that the permanent magnet plates 11 are fixed on the mounting positions 14. Through the dual positioning of the positioning pins and the slots 15, the distribution angle and radial distance of the eight permanent magnet plates 11 along the circumference can be kept completely consistent, ensuring the symmetrical uniformity of the air gap magnetic field and further reducing torque fluctuation.

[0026] This product eliminates the magnetic bridge made of traditional magnetic materials and replaces it with non-magnetic materials to support and fix the permanent magnet sheet 11. This can specifically solve the problem of magnetic leakage in IPM and significantly improve the motor output performance compared to the original IPM.

[0027] It should be noted that in this embodiment, the permanent magnet sheet 11 can also be fixed to the outside of the rotor core 12 by plastic sealing. Liquid plastic sealing material is slowly poured or injected into the gap between the permanent magnet sheet 11 and the rotor core 12, allowing the plastic sealing material to flow naturally and fill the gap. After it solidifies, the fixing is completed.

[0028] It should be noted that the support and fixing frame 20 in this embodiment can also be a carbon fiber sheath, which can fix the permanent magnet sheet 11 to the rotor core 12 by a winding process.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A rotor for a permanent magnet synchronous motor, comprising a shaft, permanent magnet plates, and a rotor core, characterized in that: The permanent magnet sheet is fixed to the outside of the rotor core by a non-magnetic support bracket or a plastic seal. The support bracket includes an upper bracket and a lower bracket, which are respectively set at the upper and lower ends of the rotor core. Positioning holes are provided at both the upper and lower ends of the rotor core. Several upper positioning posts are provided on the side of the upper bracket facing the rotor core, and several lower positioning posts are provided on the side of the lower bracket facing the rotor core. The upper and lower positioning posts are inserted into the positioning holes, so that the upper and lower brackets are installed on the rotor core.

2. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that: The rotor core is made of several thin sheets of soft magnetic material stacked together, and the rotor core is mounted on the rotating shaft.

3. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that: There are several permanent magnet plates, which are arranged in a circle around the rotor core.

4. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that: The support frame is made of plastic.

5. The rotor for a permanent magnet synchronous motor according to claim 4, characterized in that: The support frame is injection molded.

6. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that: The rotor core has several mounting positions corresponding to the permanent magnet pieces, and slots are provided between adjacent mounting positions. The upper fixing frame has several upper fixing plates corresponding to the mounting positions and several upper insertion blocks corresponding to the slots. The lower fixing frame has several lower fixing plates corresponding to the mounting positions and several lower insertion blocks corresponding to the slots. The permanent magnet pieces are installed on the mounting positions. The upper and lower insertion blocks are inserted into the slots from the upper and lower ends, respectively. The upper fixing plates and lower fixing plates are installed on the upper and lower ends of the outer side of the permanent magnet pieces, so that the permanent magnet pieces are fixed on the mounting positions.

7. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that: The support frame is made of carbon fiber sheath.

8. The rotor for a permanent magnet synchronous motor according to claim 7, characterized in that: The support frame fixes the permanent magnet sheet to the rotor core through a winding process.

9. The rotor for a permanent magnet synchronous motor according to claim 1, characterized in that: The permanent magnet sheet is rectangular in shape.

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