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Permanent magnet and permanent magnet motor

A permanent magnet, a pair of technology, applied in the direction of electrical components, electromechanical devices, magnetic circuit rotating parts, etc., can solve the problems of magnetic disappearance, reduced motor performance, large magnetic loss, etc., to achieve simple manufacturing process, reduce magnetic loss, The effect of stable performance

Pending Publication Date: 2020-03-17
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these methods is that the resistivity of the permanent magnet is limited, and the manufacturing process is difficult, making it difficult to produce stably
[0005] NdFeB permanent magnets are widely used in permanent magnet motors. This type of permanent magnet has high electrical conductivity and low distance temperature. The Curie temperature is low. When working, the magnetic loss is large, which reduces the performance of the motor.
Moreover, the higher the power of the motor, the larger the volume of the permanent magnet. When the rotor has poor heat dissipation performance, it will cause a high temperature rise during operation, and even lead to magnetic loss in extreme cases. Therefore, the magnetic loss defect of this type of material is of particular concern.

Method used

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  • Permanent magnet and permanent magnet motor
  • Permanent magnet and permanent magnet motor
  • Permanent magnet and permanent magnet motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] refer to Figure 1a , Figure 1b , Exemplarily, the permanent magnet 100 has a flat cuboid structure, which includes a first surface 11 and a second surface 12 that are parallel and opposite, and a first side wall 13 and a second side wall 14 that are perpendicular to the two surfaces and are parallel and opposite The magnetization direction of the permanent magnet is magnetization from the first surface to the second surface parallel to the first surface; the permanent magnet is formed with one or more first separation grooves 10, and the first extension of the first separation groove 10 The direction is to extend from the first surface 11 along the magnetization direction, the first separation groove runs through the second surface 12, and the length of the first separation groove 10 in the first extension direction is equal to the distance between the first surface and the second surface of the permanent magnet. Distance, the second extension direction of the first s...

Embodiment 2

[0046] refer to Figure 3a , Figure 3b , The difference between this embodiment and Embodiment 1 is that the permanent magnet of this embodiment also includes one or more second separation grooves 10', and the first extending direction of the second separation grooves 10' is from the first surface 11 Extending along the direction of magnetization, the second separation groove runs through the second surface 12, and the length of the second separation groove 10' in the extending direction is equal to the distance between the first surface and the second surface of the permanent magnet. The two extending directions are extending from the second side wall 14 to the first side wall 13 in a direction perpendicular to the second side wall, and the length of the second separation groove in the extending direction is smaller than that of the first side wall and the first side wall in this direction. The distance between the two side walls means that the first side wall does not pass...

Embodiment 3

[0056] The difference between this embodiment and Embodiment 1 is that the second extending direction of the first separation groove is from the first side wall along the direction inclined to the first side wall (that is, the direction not perpendicular to the first side wall, the second The angle between the second extension direction of a separation groove and the length direction of the permanent magnet is greater than 0° and less than 90°) extending toward the second side wall, and the length of the first separation groove in the extension direction is smaller than the first separation groove in this direction. The distance between one side wall and the second side wall, that is, does not go through the second side wall.

[0057] In another embodiment, the projection of the first separation groove on the first extending direction is a curve.

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Abstract

The invention relates to a permanent magnet and a permanent magnet motor. One or more separation grooves are formed in the permanent magnet; the separation groove penetrates through the permanent magnet in the first extending direction of the separation groove and does not penetrate through the permanent magnet in the second extending direction of the separation groove, and the first extending direction of the separation groove is parallel to the magnetizing direction of the permanent magnet, or an included angle is formed between the first extending direction of the separation groove and themagnetizing direction of the permanent magnet. The permanent magnet disclosed by the invention is simple in manufacturing process, high in resistivity, stable in rotor performance and capable of effectively reducing magnetic loss.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a permanent magnet and a permanent magnet motor. Background technique [0002] The permanent magnet is a necessary part of the permanent magnet motor. The motor generates eddy current when it is working. The eddy current causes the temperature of the permanent magnet to rise, which leads to the magnetic loss of the permanent magnet and affects the performance of the motor. [0003] In the prior art, there are mainly two ways to reduce the magnetic loss of permanent magnets: one is to change the macroscopic structure of permanent magnets, divide the magnets and then use insulating polymers to bond the magnetic sheets. The permanent magnet structure can effectively reduce magnetic losses. However, the manufacturing process is cumbersome, the cost is high, and the performance of the magnet is unstable. After bonding, it is not conducive to assembly and increases the vibra...

Claims

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Application Information

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IPC IPC(8): H02K1/06H02K1/27
CPCH02K1/06H02K1/27H02K2213/03
Inventor 于永江王鹏飞魏蕊邵梅竹
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD