Low-consumption permanent-magnet offset external rotor radial magnetic bearing

Abstract

A low power consuming eternal magnetic external rotor magnetic axletree comprises outer magnetic loop, eternal magnet, iron stators, magnetism irritation loop, inner magnetic loop, iron stators and air clearance. On each side of X and Y axes, each two iron stators constitute eight magnetic pole in four directions. On each magnetic pole enwind magnetism irritation loop, outside of the iron rotors is the outer magnetic loop, inside the iron rotors are the iron stators, where between the rotors and stators leave air clearance. The inner magnetic loop fix inside of the iron stator. The eternal magnet locates between two inner magnetic loops. The two inner loops link with two iron stators to make a magnetic circle.

Description

Technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a low-power permanent magnet bias external rotor radial magnetic bearing, which can be used as a non-contact support for rotating parts in mechanical equipment such as motors and machine tools. Background technique [0002] Magnetic suspension bearings are divided into pure electromagnetic bearings and hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The former uses large current and consumes a lot of power, and the hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The magnetic field generated by the permanent magnet bears the main load. Bearing capacity, the electromagnetic field provides auxiliary adjustment bearing capacity, so this kind of bearing can greatly reduce the control current and reduce the loss. However, some of the current permanent magnet bias outer rotor radial ma...

AI Technical Summary

Problems solved by technology

However, some of the current permanent magnet bias outer rotor radial magnetic bearing structures are based on ordinary radial electromagnetic bearings, and permanent magnets are placed upward on the electromagnetic magnetic circuit, so that the magnetic flux generated by the control coil must pass through the permanent magnets. Due to the large reluctance of the permanent magnet, the control coil needs a large excitation current to generate a certain electromagnetic flux; in addition, some structures directly connect the permanent magnet to the stator laminated core, so that the permanent magnet magnetic circuit passes through the stator core. Excessive magnetomotive force will be lost, thus greatly weakening the attraction of the permanent magnet to the rotor shaft; due to the above defects, the existing permanent magnet bias magnetic bearings have the disadvantages of large power consumption, large volume and heavy weight

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