WO2021052073A1

WO2021052073A1 - Permanent magnet rotor and permanent magnet motor

Info

Publication number: WO2021052073A1
Application number: PCT/CN2020/109117
Authority: WO
Inventors: 邵士良; 康亚杰; 张�浩
Original assignee: 上海磁雷革传动系统有限公司
Priority date: 2019-09-20
Filing date: 2020-08-14
Publication date: 2021-03-25
Also published as: CN210669662U

Abstract

A permanent magnet rotor and a permanent magnet motor. The permanent magnet rotor comprises spokes and a plurality of permanent magnets (12). The spokes are annularly arranged, and a plurality of mounting holes penetrating the spokes are uniformly spaced along the circumferential direction of the spokes. The permanent magnets (12) are arranged in a rectangular shape, and the permanent magnets (12) are respectively is disposed in the plurality of the mounting holes in one-to-one correspondence. The permanent magnet motor (10) comprising the permanent magnet rotor has lower costs, thereby improving market competitiveness, facilitating wide popularization and application.

Description

Permanent magnet rotor and permanent magnet motor

Technical field

The utility model relates to the technical field of motors, in particular to a permanent magnet rotor and a permanent magnet motor.

Background technique

Axial permanent magnet motors are also called disc permanent magnet motors. They have attracted more and more attention due to their compact structure, high efficiency, and high power density. Axial permanent magnet motors are especially suitable for electric vehicles and renewable energy systems. , Flywheel energy storage systems, industrial equipment and other occasions requiring high torque density and compact space. However, the existing axial permanent magnet motor including sector-shaped permanent magnets as shown in FIGS. 1 and 2 has a relatively high cost, which reduces its market competitiveness.

Utility model content

In order to solve the above technical problems, one purpose of the present invention is to provide a permanent magnet rotor, and a permanent magnet motor including the permanent magnet rotor has a lower cost, thereby improving market competitiveness and facilitating widespread application.

Another object of the present invention is to provide a permanent magnet motor including the above-mentioned permanent magnet rotor.

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

A permanent magnet rotor according to an embodiment of the first aspect of the present invention includes spokes and a plurality of permanent magnets, the spokes are arranged in a ring shape, and a plurality of penetrations are evenly spaced along the circumferential direction of the spokes. For the mounting holes of the spokes, the permanent magnets are arranged in a rectangular shape, and a plurality of the permanent magnets are respectively arranged in the plurality of mounting holes in a one-to-one correspondence.

Preferably, the mounting hole is formed into a rectangle corresponding to the permanent magnet.

Preferably, the permanent magnet rotor includes 10 permanent magnets.

Preferably, the width of the rectangular permanent magnet is 32.5-36.5 mm.

Preferably, the width of the rectangular permanent magnet is 34.5 mm.

The permanent magnet motor according to the embodiment of the second aspect of the present invention includes:

The permanent magnet rotor according to any of the above embodiments; and

There are two stators, the two stators are arranged on opposite sides of the permanent magnet rotor, and there is an air gap between the stator and the permanent magnet rotor.

Preferably, the permanent magnet rotor includes 10 permanent magnets, the rectangular permanent magnets have a width of 32.5-36.5 mm, and the cogging torque of the permanent magnet motor is not greater than 0.5 N.m.

The beneficial effects of the utility model are:

By setting the permanent magnets in a rectangular shape, the rectangular permanent magnets are simple in processing and molding process. In addition, the rectangular permanent magnets are processed with less waste, so that the permanent magnet rotor including the permanent magnets for assembling the permanent magnet motor has a lower cost. Improved market competitiveness, which is conducive to widespread promotion and application.

The above description is only an overview of the technical solution of the present utility model. In order to have a clearer understanding of the technical means of the present utility model and can be implemented in accordance with the content of the specification, the following is a detailed description of the preferred embodiment of the present utility model with accompanying drawings. Rear.

Description of the drawings

Figure 1 is an exploded schematic diagram of an existing permanent magnet motor;

Fig. 2 is a schematic diagram of the distribution of multiple permanent magnets in a conventional permanent magnet motor;

Figure 3 is an exploded schematic diagram of the permanent magnet motor of the embodiment of the utility model;

4 is a schematic diagram of the distribution of multiple permanent magnets in the permanent magnet motor of the embodiment of the utility model;

Fig. 5 is the mechanical characteristic curve of the permanent magnet motor according to the embodiment of the utility model and the existing permanent magnet motor including sector-shaped permanent magnets;

Fig. 6 is a cogging torque curve of a permanent magnet motor according to an embodiment of the present invention and an existing permanent magnet motor including sector-shaped permanent magnets.

detailed description

The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

The permanent magnet motor 10 according to the embodiment of the present invention includes a permanent magnet rotor and a stator 11, the stator 11 includes two, and the two stators 11 are arranged on opposite sides of the permanent magnet rotor, between the stator 11 and the permanent magnet rotor With air gap.

The permanent magnet rotor includes spokes (not shown in the figure) and a plurality of permanent magnets 12, the spokes are arranged in a ring shape, and the spokes are evenly spaced along the circumferential direction of the spokes with a plurality of mounting holes through which the spokes pass. The permanent magnets 12 is arranged in a rectangular shape, and a plurality of permanent magnets 12 are respectively arranged in a plurality of mounting holes in a one-to-one correspondence, wherein the sides of the permanent magnets 12 may be provided with adhesive so that the permanent magnets 12 are bonded in the mounting holes.

By setting the permanent magnet 12 to be rectangular, the rectangular permanent magnet 12 has a simple processing and forming process. In addition, the rectangular permanent magnet 12 has less waste during processing, so that the permanent magnet rotor including the permanent magnet 12 is used to assemble the permanent magnet motor 10 The cost is low, thereby improving the market competitiveness of the permanent magnet motor 10, which is beneficial to be widely promoted and applied.

According to some embodiments of the present invention, the mounting hole is formed into a rectangle corresponding to the permanent magnet 12. This facilitates the installation of the permanent magnet 12 in the mounting hole.

According to some embodiments of the present invention, the permanent magnet rotor includes ten permanent magnets 12.

Preferably, the width of the rectangular permanent magnet 12 is 32.5-36.5 mm. The width of the rectangular permanent magnet 12 refers to the length of the short side of the rectangular permanent magnet 12. The width of the rectangular permanent magnet 12 can be any value between 32.5 mm or 36.5 mm or 32.5 mm to 36.5 mm. The width is 32.5-36.5mm, which greatly reduces the cogging torque and torque ripple, thereby reducing the vibration and noise of the permanent magnet motor 10, and improving the control accuracy of the permanent magnet motor 10.

Further preferably, the width of the rectangular permanent magnet 12 is 34.5 mm. The cogging torque is minimized, and the vibration and noise of the permanent magnet motor 10 are minimized.

According to some embodiments of the present invention, the permanent magnet rotor includes 10 permanent magnets 12, the rectangular permanent magnet 12 has a width of 32.5-36.5 mm, and the cogging torque of the permanent magnet motor 10 is not greater than 0.5 N·m. The cogging torque of the permanent magnet motor 10 is made smaller, thereby reducing the vibration and noise of the permanent magnet motor 10 and improving the control accuracy of the permanent magnet motor 10.

The following describes the utility model through specific embodiments

Example 1

As shown in Figures 3 and 4, the permanent magnet motor 10 of the embodiment of the present invention includes a permanent magnet rotor and a stator 11. The stator 11 includes two, and the two stators 11 are arranged on opposite sides of the permanent magnet rotor. There is an air gap between the stator 11 and the permanent magnet rotor. The permanent magnet rotor includes spokes and 10 permanent magnets 12. The spokes are arranged in a ring shape. The spokes are evenly spaced along the circumferential direction of the spokes and are arranged in a rectangular installation with 10 spokes. The permanent magnets 12 are arranged in a rectangular shape, and the ten permanent magnets 12 are respectively arranged in the ten mounting holes one-to-one. The width of the rectangular permanent magnets 12 is 34.5 mm.

Thus, the permanent magnet motor 10 of Embodiment 1 of the present invention is obtained.

The mechanical characteristics of the permanent magnet motor 10 of embodiment 1 of the present invention and the existing permanent magnet motor 10 including sector-shaped permanent magnets 12' as shown in Figs. 1 and 2 were tested respectively, and the results are shown in Fig. 5. In addition, the permanent magnet motor 10 of the first embodiment of the present invention and the existing permanent magnet motor 10 including sector-shaped permanent magnets 12' were tested for cogging torque respectively. The results are shown in FIG. 6.

It can be seen from FIG. 5 that the permanent magnet motor 10 of embodiment 1 of the present invention and the existing permanent magnet motor 10 including sector-shaped permanent magnets 12' have almost the same torque at the same rotation speed, that is, embodiment 1 of the present invention. The output performance of the permanent magnet motor 10 is the same as that of the existing permanent magnet motor 10 including sector permanent magnets 12'. It can be seen from FIG. 6 that the permanent magnet motor 10 of Embodiment 1 of the present invention is comparable to the existing permanent magnet motor 10 including sector permanent magnets. Compared with the permanent magnet motor 10 of the permanent magnet 12 ′, the maximum cogging torque is smaller, which is more conducive to reducing the vibration and noise of the permanent magnet motor 10 and improving the control accuracy of the permanent magnet motor 10.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the utility model, several modifications and improvements can be made, and these all fall within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

A permanent magnet rotor is characterized in that it comprises spokes and a plurality of permanent magnets, the spokes are arranged in a ring shape, and a plurality of spokes are arranged on the spokes evenly spaced along the circumferential direction of the spokes. Mounting holes, the permanent magnets are arranged in a rectangular shape, a plurality of the permanent magnets are respectively arranged in the plurality of mounting holes in a one-to-one correspondence, the permanent magnet rotor includes 10 permanent magnets, the rectangular permanent magnets The width of the magnet is 32.5-36.5mm.
The permanent magnet rotor according to claim 1, wherein the mounting hole is formed in a rectangle corresponding to the permanent magnet.
The permanent magnet rotor according to claim 4, wherein the width of the rectangular permanent magnet is 34.5 mm.
A permanent magnet motor, comprising: the permanent magnet rotor according to any one of claims 1-3; and a stator, the stator includes two, and the two stators are arranged on the permanent magnet. On opposite sides of the rotor, there is an air gap between the stator and the permanent magnet rotor.
The permanent magnet motor according to claim 4, wherein the permanent magnet rotor includes 10 permanent magnets, the rectangular permanent magnets have a width of 32.5-36.5 mm, and the cogging of the permanent magnet motor The torque is not more than 0.5Nm.
A permanent magnet motor, characterized in that it comprises:

The permanent magnet rotor of any one of claims 1-5; and

There are two stators, the two stators are arranged on opposite sides of the permanent magnet rotor, and there is an air gap between the stator and the permanent magnet rotor.
The permanent magnet motor according to claim 6, wherein the permanent magnet rotor includes 10 permanent magnets, the rectangular permanent magnets have a width of 32.5-36.5 mm, and the cogging of the permanent magnet motor The torque is not more than 0.5Nm.