A double-layer stator permanent magnet bias radial magnetic bearing

Abstract

The invention discloses a double-layer stator permanent magnet biased radial magnetic bearing and belongs to the technical field of magnetic suspension bearings. The double-layer stator permanent magnet biased radial magnetic bearing comprises stators, a rotor, permanent magnets, a control coil, a magnetism isolating ring, a magnetism isolating body and a rotating shaft, wherein the rotor is arranged in the middle of the stators and can rotate relative to the stators; working air gaps are formed between the stators and the rotor; the permanent magnets are symmetrically arranged between two adjacent stator teeth of the stators; the rotating shaft is arranged in the middle of the rotor; the control coil is wound on stator poles of the stators; the stators comprise an upper stator layer and a lower stator layer; the magnetism isolating body and the magnetism isolating ring are arranged between yokes of the two stator layers so as to achieve a magnetism isolating effect; the axial length of the stator teeth is the same as that of the rotor; the tail ends of the stator teeth extend to be connected with the permanent magnets; the axial length of the yoke of each stator layer is only about one half of that of the rotor. According to the designed magnetic bearing in the invention, the suspension performance is improved, and the rotor loss is reduced.

Description

technical field [0001] The invention belongs to the technical field of magnetic suspension bearings, and more specifically relates to a double-layer stator permanent magnet bias radial magnetic bearing with high suspension performance and low loss. Background technique [0002] At present, due to the advantages of small mechanical wear, low energy consumption, high supporting speed, no need for lubricating oil and long service life, magnetic suspension bearings have fundamentally changed the traditional support form, and have broad applications in vacuum, ultra-clean, ultra-high-speed and other occasions. application prospects. [0003] According to the way the magnetic force is provided, magnetic bearings can be divided into three types: [0004] The first is the passive magnetic bearing, which uses the magnetic force (attraction or repulsion) generated between permanent magnets to achieve the suspension of the rotor, with a simple structure and low power consumption. How...

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Problems solved by technology

[0005] The second type is active magnetic bearings, which are generally composed of a magnetic bearing body, a levitating rotor, a displacement sensor, a controller and a power amplifier, forming a closed-loop system that can achieve precise control of the rotor and has a high rigidity

The core loss of magnetic bearings with the same polarity structure is relatively small, but the structure is relatively complex, requiring more control coils, and its axial length is relatively long, which is not conducive to the increase of the critical speed of the rotor

The magnetic bearing with heteropolar structure has short axial length and high critical speed, but its rotor will generate large core loss under high-speed operation, which is not conducive to the heat dissipation of the rotor

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