Permanent magnet offset radial magnetic bearing

Abstract

The invention relates to a permanent-magnet offset radial magnetic bearing. It includes radial stator, control coil, circle permanent magnet, exterior magnetic pole iron core and rotator covered by rotator iron core. The permanent-magnet offset radial magnetic bearing has advantage of simple structure, small volume, and light weight. It has a broad application prospect in kinds of magnetic suspension systems that take up small space on radial direction.

Description

1. Technical field [0001] The permanent magnetic bias radial magnetic bearing of the invention belongs to the hybrid magnetic bearing in the magnetic bearing. 2. Background technology [0002] At present, magnetic bearings are divided into the following types according to the way the magnetic force is provided: The first type is active magnetic bearings. There is a bias current in the magnetic bearing coil to provide a bias magnetic field, and the control current generated by the control current flows through the control winding. The magnetic flux is superimposed with the bias flux to create a controllable levitation force. It has high rigidity and can be precisely controlled, but its volume, weight and power consumption are relatively large. The second type is passive magnetic bearings. The levitation force of this magnetic bearing is completely provided by permanent magnets. The required controller is simple, and the levitation power consumption is small, but the stiffnes...

AI Technical Summary

Problems solved by technology

It has high rigidity and can be precisely controlled, but its volume, weight and power consumption are relatively large

The second type is passive magnetic bearings. The levitation force of this magnetic bearing is completely provided by permanent magnets. The required controller is simple, and the levitation power consumption is small, but the stiffness and damping are small, and it is generally used in only one direction. Supporting objects or reducing the load acting on traditional bearings, high-temperature superconducting magnetic bearings belonging to passive magnetic bearings can obtain stable suspension by using permanent magnets due to the diamagnetism of superconductors, but due to the limitations of the research status of high-temperature superconducting materials , currently of little value

[0003] At present, the structure forms of permanent magnet bias radial magnetic bearings researched internationally are divided into heteropolar and homopolar structures. The axial length of heteropolar structures can be made shorter, but hysteresis loss will occur, while homopolar structures The hysteresis loss of the magnetic bearing with the structure is greatly reduced, but the structure of the ordinary homopolar structure is complicated, the required control wire package is large, and the axial space occupied is large, which is not conducive to the improvement of the critical speed of the rotor.

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