Inner rotor permanent magnet biased radial magnetic bearing with double permanent magnets

Abstract

The invention relates to an inner rotor permanent magnet biased radial magnetic bearing with double permanent magnets, comprising outer magnetic rings, an outer permanent magnet, stator iron cores, exciting coils, rotor iron cores, inner magnetic rings and an inner permanent magnet. Either stator iron core forms four magnetic poles, the two stator iron cores form eight magnetic poles at the left end and the right end of the magnetic bearing, i.e. respectively forming the magnetic poles of the X-axis and the Y-axis in the positive directions and the negative directions, either stator magnetic pole is wound by the exciting coil, the outer magnetic ring is arranged outside and connected with either stator iron core, the outer permanent magnet is arranged among the outer magnetic rings, the rotor iron core is arranged inside either stator iron core, a certain gap is formed between the inner surface of the stator iron core and the outer surface of the rotor iron core so as to form an air gap, the inner magnetic ring is mounted inside either rotor iron core, and the rotor iron core at the left end and the rotor iron core at the right end are connected by the inner magnetic rings between which the inner permanent magnet is arranged. The invention solves the problem of great residual magnetic moment of a traditional permanent magnet biased inner rotor radial magnetic bearing.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a permanent magnet bias external rotor radial magnetic bearing for compensating residual magnetic moment, which can be used as a non-contact support for rotating components such as magnetic suspension control moment gyro and magnetic suspension flywheel system for space, Reduce the magnetic interference of its own residual magnetism to external components. Background technique [0002] Magnetic suspension bearings are divided into pure electromagnetic type and hybrid magnetic suspension bearing with permanent magnetic bias and electromagnetic control. The former uses large current and high power consumption, and the hybrid magnetic suspension bearing with permanent magnetic bias and electromagnetic control uses permanent magnets instead of pure electromagnetic magnetic bearings. The bias current in the bearing generates a bias magnetic field, the magnetic field generat...

AI Technical Summary

Problems solved by technology

There are few existing methods for compensating the residual magnetic moment. The main method is to measure the residual magnetic moment through experiments, and to perform magnetic compensation through the magnetic torque device in the flywheel according to the magnetic conditions in the track. This method is very complicated to implement. Another method is to compensate by adding a permanent magnet. This method is still based on the experimental test, and the compensation of the external permanent magnet is carried out according to the measured results. The size of the permanent magnet added by this method has no rules to follow. Moreover, the external permanent magnet increases the volume of the flywheel and other devices, and the external permanent magnet brings unpredictable loss to the magnetically conductive rotating part of the flywheel and other devices at high speed, which affects the stability of the magnetic performance of the whole machine.

In view of the above reasons, the existing radial magnetic bearings have defects such as large residual magnetic moment in the axial direction and the existing compensation method is very complicated and will increase the volume of the device.

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