Composite magnet structure

Abstract

The utility model discloses a composite magnet structure which comprises a first magnet, a plurality of cavities are arranged on the first magnet, second magnets are arranged in the cavities, the first magnet is of an injection molding structure, and the second magnets are of an injection molding or sintering molding structure. According to the utility model, the composite structure of the first magnet and the second magnet is adopted, and the first magnet is formed by injection molding of the injection molding ferrite material, so that not only can a complex structure be provided and a combined connection effect be achieved, but also material choices suitable for various environments can be provided, and excellent performances such as corrosion resistance, temperature and humidity resistance and wear resistance can be ensured; the second magnet is formed by injection molding or sintering of a samarium-iron-nitrogen or neodymium-iron-boron material with high magnetic performance, and high magnetic performance is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnet manufacturing, and particularly relates to a composite magnet structure. Background Technique

[0002] At present, the structures and materials of magnetic components (mainly referring to magnetic rotors) in motors on the market are mainly as follows:

[0003] (1) Neodymium iron boron or samarium cobalt magnetic raw materials are sintered or injection molded and combined with silicon steel sheets to make magnetic rotors;

[0004] (2) Ferrite magnetic raw materials are sintered or injection molded and combined with silicon steel sheets to make magnetic rotors;

[0005] (3) Ferrite magnetic raw materials are sintered or injection molded directly into magnetic rotors.

[0006] However, there are some problems in actual applications. For example:

[0007] (1) The scheme of using neodymium iron boron or samarium cobalt as magnetic raw materials to make magnetic rotors has high magnetism, but is expensive, prone to rust, and has great assembly difficulty;

[0008] (2) The scheme of using ferrite as magnetic raw materials to make magnetic rotors has low cost, but the corresponding magnetism is also low;

[0009] (3) Ferrite magnets are further divided into injection molded ferrite magnets and sintered ferrite magnets. The former has lower magnetism, but good material flexibility and is easy to manufacture various complex shapes; the latter has slightly higher magnetism, but high brittleness and is easy to crack and cannot be made into complex structures;

[0010] (4) When silicon steel sheets are used in combination with magnetic bodies, they only play an auxiliary role in magnetic flux passing and cannot increase the magnetic performance of the rotor itself.

[0011] Therefore, there is an urgent need for a composite magnet structure that can ensure both good magnetic performance and excellent performance such as corrosion resistance, temperature and humidity resistance, and wear resistance. Content of the Utility Model

[0012] The purpose of the utility model is to provide a composite magnet structure to solve the problems raised in the above background technique. A composite magnet structure provided by the utility model has the characteristics of being able to ensure both good magnetic performance and excellent performance such as corrosion resistance, temperature and humidity resistance, and wear resistance.

[0013] To achieve the above purpose, the utility model provides the following technical scheme: A composite magnet structure includes a first magnet, and a plurality of cavities are provided on the first magnet. A second magnet is provided inside the cavities. The first magnet is an injection molded structure, and the second magnet is an injection molded or sintered structure.

[0014] In the present utility model, further, the first magnet is injection-molded from an injection-molded ferrite material.

[0015] In the present utility model, further, the base material of the injection-molded ferrite material includes, but is not limited to, one of PA6, PA12, PPS, or EEA.

[0016] In the present utility model, further, the second magnet is injection-molded or sintered from one of samarium iron nitride or neodymium iron boron.

[0017] In the present utility model, further, the A surface or the B surface of the second magnet is respectively an arc-shaped or flat structure.

[0018] In the present utility model, further, the second magnet is connected to the first magnet by injection molding, glue, or interference fit.

[0019] In the present utility model, further, a method for realizing the composite magnet structure includes the following steps:

[0020] (1) Injection-mold the first magnet;

[0021] (2) Injection-mold or sinter the second magnet;

[0022] (3) Connect the second magnet to the first magnet by injection molding, bonding, or interference fit.

[0023] In the present utility model, further, the first magnet and the second magnet can be magnetized either during the molding process or after molding.

[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0025] 1. The present utility model adopts a composite structure of a first magnet and a second magnet. Among them, the first magnet is injection-molded from an injection-molded ferrite material, which can not only provide a complex structure and play a role in combined connection, but also provide material selection suitable for various environments, ensuring excellent properties such as corrosion resistance, temperature and humidity resistance, and wear resistance. The second magnet is injection-molded or sintered from a samarium iron nitride or neodymium iron boron material with high magnetic properties, ensuring high magnetic properties;

[0026] 2. The present utility model can select the corresponding preparation process and materials according to the actual application requirements, and has the characteristics of wide application range and low application cost;

[0027] 3. The first magnet and the second magnet of the present utility model can be magnetized either during the molding process or after molding, thus having better magnetic properties. Description of the Drawings

[0028] Figure 1 Structural schematic diagram of Embodiment 1 of the present utility model;

[0029] Figure 2 Structural schematic diagram of the first magnet in Embodiment 1 of the present utility model;

[0030] Figure 3 Structural schematic diagram of the second magnet in Embodiment 1 of the present utility model;

[0031] Figure 4 Partial structural schematic diagram of the cooperation between the first magnet and the second magnet in Embodiment 1 of the present utility model;

[0032] Figure 5 Structural schematic diagram of Embodiment 2 of the present utility model;

[0033] Figure 6 Structural schematic diagram of Embodiment 3 of the present utility model;

[0034] Figure 7 Structural schematic diagram of Embodiment 4 of the present utility model;

[0035] In the figure: 1, the first magnet; 2, the second magnet; 3, the cavity. Specific embodiments

[0036] 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 of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0037] Embodiment 1

[0038] Please refer to Figure 1-4 , the present utility model provides the following technical solutions: A composite magnet structure includes a first magnet 1 injection-molded from an injection-molded ferrite material with a base material of PA6 and ten second magnets 2 injection-molded from samarium iron nitride. The first magnet 1 and the second magnet 2 are magnetized during the molding process respectively. The ten second magnets 2 are respectively inserted into the cavity 3 and connected by glue. This embodiment is often applied to the magnetic rotor in a fan motor.

[0039] In practical applications, the shape of the second magnet 2 can be determined according to specific magnetic performance requirements. Specifically, in this embodiment, both the A surface and the B surface of the second magnet 2 are arc-shaped structures.

[0040] In addition, as Figure 4As shown, the distances t1, t2, and t3 from the second magnet 2 to the outer surface (or inner surface) of the first magnet 1 can be adjusted by adjusting the radian of the second magnet 2, thereby realizing the adjustment of the sinusoidality of the surface magnetic induction intensity curve.

[0041] Embodiment 2

[0042] Please refer to Figure 5 , a composite magnet structure, including a first magnet 1 injection-molded from an injection-molded ferrite material with a base material of PA12 and four second magnets 2 injection-molded from samarium iron nitride. The first magnet 1 and the second magnets 2 are magnetized during the molding process respectively, and the four second magnets 2 are injection-connected to the first magnet 1. This embodiment is often applied to the magnetic rotor in the water pump of household electrical appliances.

[0043] In practical applications, according to actual application requirements, the magnetic properties can be adjusted by adjusting the number m of the second magnets 2, the length L, width H, total number of magnetic poles M of the second magnets 2, or the value of the distance t between the second magnets 2 and the outer surface of the first magnet 1; usually M = m or M = 2m. For high magnetic property requirements, smaller t values and larger L and H values can be selected, generally t ≥ 0.5 mm.

[0044] Embodiment 3

[0045] Please refer to Figure 6 , a composite magnet structure, including a first magnet 1 injection-molded from an injection-molded ferrite material with a base material of PPS and a second magnet 2 injection-molded from neodymium iron boron material in the cavity 3. The first magnet 1 and the second magnet 2 are magnetized during the molding process respectively. This embodiment is often applied to the magnetic rotor of high-voltage motors.

[0046] Embodiment 4

[0047] Please refer to Figure 7 , a composite magnet structure, including a second magnet 2 sintered from neodymium iron boron material and a first magnet 1 injection-molded from an injection-molded ferrite material with a base material of PPS and covering the outside of the second magnet 2. The first magnet 1 and the second magnet 2 are post-magnetized by a magnetization fixture after molding. This embodiment is often applied to the magnetic rotor of the cooling water pump of new energy vehicles.

[0048] In summary, the present utility model adopts a composite structure of a first magnet 1 and a second magnet 2. Among them, the first magnet 1 is injection-molded from an injection-molded ferrite material, which can not only provide a complex structure and play a role in combined connection, but also provide material selection suitable for various environments to ensure excellent properties such as corrosion resistance, temperature and humidity resistance, and wear resistance. The second magnet 2 is injection-molded or sintered from a samarium iron nitride or neodymium iron boron material with relatively high magnetic properties, ensuring relatively high magnetic properties. The present utility model can select corresponding preparation processes and materials according to actual application requirements, and has the characteristics of wide application range and low application cost. The first magnet 1 and the second magnet 2 of the present utility model can be magnetized either during the injection molding process or by post-magnetization, thereby having better magnetic properties.

[0049] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A composite magnet structure, comprising a first magnet, characterized in that: The first magnet is provided with a plurality of cavities, and the second magnet is provided inside the cavities. The first magnet is an injection molding structure, and the second magnet is an injection molding or sintering molding structure. The first magnet is injection molded from an injection-molded ferrite material; The second magnet is formed by injection molding or sintering of one of samarium iron nitrogen and neodymium iron boron.

2. A composite magnet structure according to claim 1, characterized in that: The substrate of the injection-molded ferrite material includes but is not limited to one of PA6, PA12, PPS or EEA.

3. A composite magnet structure according to claim 1, characterized in that: The A surface or the B surface of the second magnet is an arc-shaped or a plane structure respectively.

4. A composite magnet structure according to claim 1, characterized in that: The second magnet is connected to the first magnet by injection molding, glue or interference fit.

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