Permanent magnetism magnetic pole component for high-power permanent magnet motor

Abstract

The invention relates to a permanent-magnet magnetic pole component for a high-power permanent-magnet motor, comprising permanent magnets, a magnetic conduction yoke of a rotor, magnet protection positioning covers and magnetic pole locking pins, wherein the permanent magnets, the magnetic conduction yoke of the rotor and the magnet protection positioning covers form a permanent-magnet magnetic pole through adhesion, the arrangement of alternate N and S pole permanent-magnet magnetic poles is formed on the magnetic conduction yoke of the rotor, and two or a plurality of permanent-magnet magnetic poles are mutually connected to form the permanent-magnet magnetic pole component. The permanent-magnet magnetic pole component realizes the corrosion resistance and the thermal insulation of neodymium-iron-boron magnets, and greatly prolongs the service life of the permanent magnets.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, in particular, the invention relates to permanent magnet pole assemblies in high-power permanent magnet motors. Background technique [0002] In the past ten years, with the continuous improvement of the performance of NdFeB permanent magnet materials, the improvement of thermal stability and corrosion resistance of materials and the gradual reduction of prices, the development and application of high-power NdFeB permanent magnet motors have entered a new stage. stage. [0003] Due to the relatively small volume of the magnets used in traditional low-power permanent magnet motors, the surface of the magnets can usually meet the requirements of the motor after anti-corrosion treatment such as electroplating and electrophoretic coating. With the increase of the power of the permanent magnet motor, the area and volume of the single magnetic pole increase accordingly. In addition, th...

AI Technical Summary

Problems solved by technology

With the increase of the power of the permanent magnet motor, the area and volume of the single magnetic pole increase accordingly. In addition, the operating environment of the high-power permanent magnet motor is relatively harsh, the temperature rises, and the heat dissipation is large. Corrosion, heat resistance and demagnetization are particularly important. Traditional magnetic pole surface protection methods often cannot meet anti-corrosion requirements; The chance of scratches on the surface of the magnet is greatly increased. Once the surface is damaged, it will directly threaten the performance of the NdFeB magnet and the service life of the motor

After the well-known motor rotor magnetic steel is assembled, the surrounding epoxy perfusion is added, and the surface is protected by glass fiber cloth winding, or the rotor surface is covered with a thin stainless steel sleeve for epoxy perfusion protection, etc. Although they are all poleless shoe magnetic pole structures, the assembly process is cumbersome. , not suitable for mass production; in the published patent (CN1956263A), the laminated pole shoe protection and component assembly can protect the magnet from bumping and reduce the influence of armature reaction demagnetization, but the eddy current heating of the pole shoe and Heat conduction will increase the operating temperature of the magnet, increase the magnetic flux leakage, and reduce the performance of the magnetic steel and other unfavorable factors.

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