Rotor permanent magnet array structure
Through the combined structure of the main permanent magnet and the secondary permanent magnet, the high cost of the axial flux motor is solved, and the use of rare earths and the enhancement of magnetic field strength is achieved. It is suitable for the multi-layer stacking structure of axial flux motors.
Patent Information
- Application Number
- CN202421587349.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-06
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-06
AI Technical Summary
In order to improve the magnetic field strength, existing axial flux motors need to use a large number of high-cost customized sector-shaped permanent magnets, resulting in high product costs.
A combined structure of main permanent magnet and secondary permanent magnet is adopted, where the main permanent magnet is located in the center of the single magnetic pole division area, and the secondary permanent magnet is located in the inner and outer areas. The main permanent magnet is connected in parallel with the secondary permanent magnet, and the magnetic circuit design is optimized to reduce the use of rare earths.
It effectively reduces the use of rare earths, reduces pollution, reduces costs, and enhances the magnetic field strength. It is suitable for multi-layer stacking structures of axial flux motors.
Smart Images
Figure CN223124677U_ABST
Abstract
Description
Technical Field
[0001] The utility model discloses a rotor permanent magnet array structure, which relates to the technical field of axial flux permanent magnet motors, and particularly relates to a rotor magnetic array structure of an axial flux generator. Background Art
[0002] With the country's strong promotion of scientific and technological innovation and energy transformation, motor technology is involved in many fields such as power generation, new energy vehicles, and robots. The axial flux motor has the advantages of high torque density, compact axial structure, and high efficiency, and has gradually attracted people's attention and been widely used in related fields.
[0003] However, in order to improve the performance of the axial flux motor, people often need to customize special sector-shaped permanent magnets. To increase the magnetic field strength, they often spend a large amount of cost to purchase better and more powerful permanent magnets, and the ultimate cost is that the cost of the product remains high. Summary of the Invention
[0004] The utility model overcomes the deficiencies of the existing technology and provides a rotor permanent magnet array structure. This technology can effectively reduce costs, reduce the use of rare earths and thus reduce pollution, and enhance the magnetic field by optimizing the magnetic circuit.
[0005] To solve the above technical problems, the present invention provides the following technical solutions.
[0006] A rotor permanent magnet array structure includes a main permanent magnet and a secondary permanent magnet. The main permanent magnet is preferably cylindrical, and the secondary permanent magnet is preferably cylindrical. The diameter of the secondary permanent magnet is smaller than that of the main permanent magnet. The height of the main permanent magnet and the secondary permanent magnet is infinitely close and preferably equal. The main permanent magnet is located at the center position of the single magnetic pole division area and is preferably as large as possible in diameter within the single magnetic pole division area. The secondary permanent magnets are respectively located in the inner area and the outer area divided by the main permanent magnet interval area in the single magnetic pole division area, and at least one center of the secondary permanent magnets in the inner area must be on the single magnetic pole center line, and the preferred positions of the other secondary permanent magnets are on the single magnetic pole center line.
[0007] Furthermore, the main permanent magnet is unique in the single magnetic pole division area, the number of secondary permanent magnets in the single magnetic pole division area is ≥2, and when there are only 2 secondary permanent magnets, they must be on the single magnetic pole center line.
[0008] Furthermore, the height dimension of the main permanent magnet is less than or equal to its diameter dimension.
[0009] Furthermore, preferably, the height dimension of the secondary permanent magnet is less than or equal to its diameter dimension.
[0010] Furthermore, the diameter of the secondary permanent magnet is smaller than that of the main permanent magnet.
[0011] Furthermore, the main permanent magnet and the auxiliary permanent magnet are in the same single magnetic pole division area, with the same pole direction and connected in parallel.
[0012] Furthermore, inside the rotor, the areas adjacent to the single magnetic pole division area are opposite.
[0013] Furthermore, the inner and outer areas within the said interval refer to the area close to the rotor axis as the inner area, and the other area farther from the rotor axis as the outer area.
[0014] Furthermore, the first condition of the single magnetic pole division area is obtained by equally dividing the angle according to the number of rotor poles, and the second condition is determined according to the effect on the stator winding.
[0015] Furthermore, the shapes of the main permanent magnet and the auxiliary permanent magnet can be cylinders, cubes, rectangles, or sector bodies. When the main permanent magnet and the auxiliary permanent magnet are not cylinders, circles are drawn respectively with the axes of the main permanent magnet and the auxiliary permanent magnet as the centers, and the straight-line distances from the centers to the nearest points on their respective side edges as the radii. Then, their respective heights are virtually regarded as cylinders and arranged in an array according to the above design.
[0016] Furthermore, the present invention can be applied to a Halbach array with the same principle. In the Halbach array, the left and right lateral enhancement magnets of the main permanent magnet are regarded as special existences within the interval area of the main permanent magnet and are ignored.
[0017] The beneficial effects of the present invention are as follows
[0018] Through the parallel connection of the specific main and auxiliary structures of the present invention within the same pole domain, the magnetic circuit can be effectively sorted and optimized; the parallel connection effect of adjacent magnetic poles can be improved, the magnetic line diffusion can be corrected, and the axial magnetic field of the rotor can be enhanced; the use of rare earths can be reduced, making it more environmentally friendly; the cost can be reduced, the versatility of cylindrical magnets can be increased, and the cumbersome processes and various additional costs of specific sector magnets can be reduced; its unique double-sided magnetic field enhancement characteristic is beneficial to the multi-layer stacking structure of axial flux motors; if applied to single-stator structure motors and generators, it can be combined with a Halbach array to obtain a more ideal magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The following further describes the present invention with reference to the accompanying drawings.
[0020] Figure 1 It is a schematic diagram of a twelve-pole rotor.
[0021] Figure 2 It is a schematic diagram of the area division of a twelve-pole rotor.
[0022] Figure 3 It is a schematic diagram of the conventional arrangement of a twelve-pole rotor.
[0023] Figure 4Schematic diagram of using this structure with only 2 sub-permanent magnets for a twelve-pole rotor.
[0024] Figure 5 Schematic diagram of using this structure with more than 2 sub-permanent magnets for a twelve-pole rotor.
[0025] As shown in the figure: main permanent magnet 01, sub-permanent magnet 02, single magnetic pole division area 101, single magnetic pole center line 102, inner area 201, outer area 202, main permanent magnet interval area 203. Detailed implementation manners
[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail in combination with embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solutions of the present invention will be described in detail below in combination with embodiments and drawings, but the protection scope is not limited by this.
[0027] As Figures 1-5 shown, this embodiment provides a rotor permanent magnet array structure, including a main permanent magnet 01, a sub-permanent magnet 02, a single magnetic pole division area 101, a single magnetic pole center line 102, an inner area 201, an outer area 202, and a main permanent magnet interval area 203.
[0028] As Figure 1 shown, the twelve-pole rotor is divided into 12 single magnetic pole division areas 101, and the single magnetic pole center line 102 is located at the exact center of the single magnetic pole division area 101, and the area is divided into symmetric sectors.
[0029] As Figure 2 shown, the twelve-pole rotor is divided into 12 single magnetic pole division areas 101, and within the single magnetic pole division area 101, three areas are divided with the main permanent magnet interval area 203 as the head, namely the inner area 201, the outer area 202, and the main permanent magnet interval area 203.
[0030] As Figure 3 shown, the conventional arrangement of the twelve-pole rotor is a sector or a cuboid, and a sector is exemplified here.
[0031] As Figure 4 shown, the main permanent magnet 01 is located at the center position of the corresponding single magnetic pole division area 101 and has as large a diameter as possible within the corresponding single magnetic pole division area 101. The sub-permanent magnets 02 are respectively located in the inner area and the outer area divided with the main permanent magnet interval area of the corresponding single magnetic pole division area 101 as the head. When the number of sub-permanent magnets 02 in the single magnetic pole division area 101 is equal to 2, the sub-permanent magnets 02 must be on the single magnetic pole center line 102.
[0032] As Figure 5As shown, when the number of secondary permanent magnets 02 in the single magnetic pole division area 101 is greater than 2, at least one center of the secondary permanent magnets 02 in the inner area 201 must be on the single magnetic pole center line 102.
[0033] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the present invention, several simple deductions or substitutions can still be made, which should all be regarded as falling within the patent protection scope determined by the claims submitted for the present invention.
Claims
1. A rotor permanent magnet array structure, characterized in that, It includes a main permanent magnet and auxiliary permanent magnets. The main permanent magnet is unique in the single-magnetic-pole division region. The number of the auxiliary permanent magnets in the single-magnetic-pole division region is ≥ 2. The diameter of the circle of the auxiliary permanent magnets is smaller than that of the main permanent magnet. The height of the main permanent magnet is infinitely close to that of the auxiliary permanent magnets. The main permanent magnet is located at the center position of the single-magnetic-pole division region and has the largest possible diameter within the single-magnetic-pole division region. The auxiliary permanent magnets are respectively located in the inner region and the outer region divided by the interval region of the main permanent magnet in the single-magnetic-pole division region. And at least one center of the auxiliary permanent magnets in the inner region must be on the single-magnetic-pole center line. When there are only two auxiliary permanent magnets, they must be on the single-magnetic-pole center line. The height dimension of the main permanent magnet is less than or equal to its diameter dimension. The height dimension of the main permanent magnet is less than or equal to its diameter dimension. The diameter of the auxiliary permanent magnets is smaller than that of the main permanent magnet.
2. The rotor permanent magnet array structure according to claim 1, wherein, The main permanent magnet and the auxiliary permanent magnets are in the same single-magnetic-pole division region, with the same pole direction and in parallel connection.
3. The rotor permanent magnet array structure according to claim 1, wherein The shapes of the main permanent magnet and the auxiliary permanent magnets can be cylinders, cubes, rectangles, or sector bodies.
4. A rotor permanent magnet array structure, characterized in that, It can be applied to Halbach arrays.