Magnetic assembly for motor

Abstract

The utility model relates to the technical field of magnets, in particular to a magnetic assembly for a motor, which comprises fan-shaped magnets and a rotating shaft, the fan-shaped magnets are arranged into a circular ring cylinder in a manner that the wide surfaces face outwards and the narrow surfaces face inwards, two connected fan-shaped magnets have opposite polarities on the outer side of the circular ring cylinder, and the rotating shaft is positioned in a middle hole of the circular ring cylinder. And the plurality of fan-shaped magnets and the rotating shaft are bonded together by glue. According to the utility model, all the magnets are spliced into the circular ring cylinder, the rotating shaft is positioned in the middle hole of the circular ring cylinder, and all the magnets and the rotating shaft are bonded together through glue to form the assembly. In the assembly, each magnet has a single easy magnetization direction, all the magnets are in a magnetized state, and the magnetic polarities of the outer sides of two adjacent magnets are opposite, so that the problems of complex production process, low yield and low magnetic performance of the traditional multi-stage magnetic ring are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnets, and particularly relates to a magnetic component for an electric motor. Background Technique

[0002] At present, the multi-stage magnetic rings with 4 poles or more used in the field of electric motors are made of integral magnets. In the preparation process of the magnetic ring, integral orientation, integral forming, integral sintering, and integral magnetization are required. Each step has a great influence on the performance of the magnet. In addition, the production process of the integral multi-stage magnetic ring is complex and the yield is low, resulting in extremely high costs and difficulty in mass production, which greatly hinders the popularization and use of the multi-stage magnetic ring motor. Content of the Utility Model

[0003] The purpose of the utility model is to provide a magnetic component for an electric motor to solve the problems of complex process, low yield, and difficulty in mass production of the integral multi-stage magnetic ring mentioned in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A magnetic component for an electric motor includes a sector magnet and a rotating shaft. The sector magnets are arranged in a circular cylindrical shape with the wide faces facing outwards and the narrow faces facing inwards, and the adjacent two sector magnets show opposite polarities on the outer side of the circular cylindrical shape. The rotating shaft is located in the middle hole of the circular cylindrical shape, and multiple sector magnets and the rotating shaft are bonded together with glue.

[0005] Preferably, the material of the sector magnet is a magnetically anisotropic permanent magnet material with only one easy magnetization direction, and the easy magnetization direction is the normal direction at the center point of the outer arc.

[0006] Preferably, the material of the sector magnet is a sintered neodymium iron boron magnet with a remanence greater than 1.2T and an intrinsic coercivity greater than 15KOE.

[0007] Preferably, the inner side of the sector cross-section of the sector magnet is a single or multiple line segments, a single or multiple arc segments, or a combined line body of line segments and arcs.

[0008] Preferably, the difference in the opening angles of all the sector magnets is within 5°.

[0009] Preferably, at least 30% of the area on both sides of the sector magnet needs to be covered with glue, and the rotating shaft in the magnet steel needs to be bonded to the magnet with an area of more than 20%.

[0010] Preferably, an anti-corrosion coating needs to be added to all the magnet surfaces of the sector magnet in contact with the external environment. The coating includes: single-layer Zn, multi-layer Zn, single-layer Ni, multi-layer Ni, single-layer Cu, Ni-Cu-Ni three-layer structure, Zn-ZnNi alloy two-layer structure, Cu-Ni two-layer structure, Zn-ZnNi-Cu-Ni four-layer structure.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. By splicing all the magnets into a circular column, with the rotating shaft located in the central hole of the circular column, and all the magnets and the rotating shaft being bonded together with glue to form the assembly. In the assembly, each magnet has a single easy magnetization direction, and all the magnets are in a magnetized state, with the magnetic polarities shown on the outer sides of adjacent two magnets being opposite, thus solving the problems of complex production process, low yield, and low magnetic performance of traditional multi-stage magnetic rings.

[0013] 2. The magnetic pair is assembled by disassembling the product and then bonding and assembling it for reprocessing. The performance of the motor rotor produced in this mode is much higher than that of the radiation ring, and the difficulty of magnetization that cannot be carried out for small-sized radiation rings is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an exploded view of the sector magnet and the rotating shaft of the present utility model;

[0015] Figure 2 is of the present utility model Figure 1 a schematic diagram of the gluing structure of the sector magnet and the rotating shaft therein;

[0016] Figure 3 is of the present utility model Figure 2 a schematic diagram of the potting structure of the sector magnet and the rotating shaft therein;

[0017] Figure 4 is of the present utility model Figure 3 a schematic diagram of the grinding structure of the sector magnet and the rotating shaft therein;

[0018] Figure 5 is of the present utility model Figure 4 a schematic diagram of the electroplating structure of the sector magnet and the rotating shaft therein.

[0019] In the figure: 1. Sector magnet; 2. Rotating shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-5 , an embodiment provided by the present utility model:

[0022] A magnetic component for an electric motor, comprising a sector magnet 1 and a rotating shaft 2. The sector magnets 1 are arranged with their wide faces facing outwards and their narrow faces facing inwards to form an annular cylinder, and the adjacent two sector magnets 1 exhibit opposite polarities on the outer side of the annular cylinder. The rotating shaft 2 is located in the central hole of the annular cylinder, and multiple sector magnets 1 and the rotating shaft 2 are bonded together with glue.

[0023] Furthermore, the material of the sector magnet 1 is a magnetically anisotropic permanent magnet material with only one easy magnetization direction, and the easy magnetization direction is the normal direction at the center point of the outer arc.

[0024] Furthermore, the material of the sector magnet 1 is a sintered neodymium iron boron magnet with a remanence greater than 1.2T and an intrinsic coercivity greater than 15KOE.

[0025] Furthermore, the inner side of the sector cross-section of the sector magnet 1 is a single or multiple line segments, a single or multiple arc segments, or a combined line of line segments and arcs.

[0026] Furthermore, the difference in the opening angles of all the sector magnets 1 is within 5°.

[0027] Furthermore, at least 30% of the areas on both sides of the sector magnet 1 need to be covered with glue, and for the rotating shaft inside the magnet steel, more than 20% of the area needs to be bonded to the magnet.

[0028] Furthermore, an anti-corrosion coating needs to be added to all the magnet faces of the sector magnet 1 in contact with the external environment. The coating includes: single-layer Zn, multi-layer Zn, single-layer Ni, multi-layer Ni, single-layer Cu, Ni-Cu-Ni three-layer structure, Zn-ZnNi alloy two-layer structure, Cu-Ni two-layer structure, Zn-ZnNi-Cu-Ni four-layer structure.

[0029] Working principle: By arranging the sector magnets 1 with their wide faces facing outwards and their narrow faces facing inwards to form an annular cylinder, and the adjacent two sector magnets 1 exhibit opposite polarities on the outer side of the annular cylinder. The rotating shaft 2 is located in the central hole of the annular cylinder, and multiple sector magnets 1 and the rotating shaft 2 are bonded together with glue. Then, the sector magnets 1 and the rotating shaft 2 are assembled into a ring by potting. Next, the potted sector magnets 1 and the rotating shaft 2 are formed into a ring by grinding. Finally, the required magnetic component is made through an electroplating process. In the component, each magnet has a single easy magnetization direction, and all the magnets are in a magnetized state, and the magnetic polarities shown on the outer sides of the adjacent two magnets are opposite.

[0030] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A magnetic component for an electric motor, comprising a sector magnet (1) and a rotating shaft (2), characterized in that: The sector magnets (1) are arranged in a toroidal cylinder with the wide faces facing outwards and the narrow faces facing inwards, and the adjacent two sector magnets (1) have opposite polarities on the outer side of the toroidal cylinder. The rotating shaft (2) is located in the central hole of the toroidal cylinder, and multiple sector magnets (1) and the rotating shaft (2) are bonded together with glue.

2. The magnetic component for an electric machine according to claim 1, characterized in that: The material of the sector magnet (1) is a magnetically anisotropic permanent magnet material with only one easy magnetization direction, and the easy magnetization direction is the normal direction at the center point of the outer arc.

3. A magnetic component for an electric motor according to claim 1, characterized in that: The material of the sector magnet (1) is a sintered neodymium iron boron magnet with a remanence greater than 1.2T and an intrinsic coercivity greater than 15KOE.

4. A magnetic component for an electric motor according to claim 1, characterized in that: The inner side of the sector cross-section of the sector magnet (1) is a single or multiple line segments, a single or multiple arc segments, or a combined line of line segments and arcs.

5. A magnetic component for an electric motor according to claim 1, characterized in that: The difference in the opening angles of all the sector magnets (1) is within 5°.

6. A magnetic component for an electric motor according to claim 1, characterized in that: At least 30% of the area on both sides of the sector magnet (1) needs to be covered with glue, and for the rotating shaft inside the magnet steel, more than 20% of the area needs to be bonded to the magnet.

7. A magnetic component for an electric motor according to claim 1, characterized in that: An anti-corrosion coating needs to be added to all the magnet faces where the sector magnet (1) contacts the external environment.

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