Permanent-magnet-biased axial magnetic bearing

Abstract

The invention discloses a permanent-magnet-biased axial magnetic bearing in the technical field of magnetic bearings. The permanent-magnet-biased axial magnetic bearing comprises a stator assembly and a rotor assembly; the stator assembly comprises an axial stator, an axial control winding, a septum magnet, a magnetizer and a permanent magnet; the rotor assembly comprises a rotation shaft and a rotor core; the axial control winding is wound on a magnetic pole of the axial stator; the rotor core is sleeved on the rotation shaft; the magnetizer is arranged in the axial stator, and the external end of the magnetizer is connected with the internal end of the axial stator; the septum magnet is arranged in the axial stator, the external end of the septum magnet is connected with the internal end of the axial stator; the permanent magnet is adhered to one side of the magnetizer, and the external end of the permanent magnet is contacted with the inner end face of the septum magnet; and the rotor core is arranged in the axial stator. The permanent-magnet-biased axial magnetic bearing has a simple structure, and is high in critical rotation speed, and low in power consumption; and magnetic flux flows in an axial direction and is decoupled with the radial suspension force completely, so the permanent-magnet-biased axial magnetic bearing is convenient to control.

Description

technical field [0001] The invention relates to a hybrid magnetic bearing in the technical field of magnetic bearings, in particular to a permanent magnetic bias axial magnetic bearing. Background technique [0002] Magnetic suspension bearing, also referred to as magnetic bearing for short, is a new type of high-performance bearing that uses the magnetic force between the stator and the rotor to suspend the rotor in space, so that there is no mechanical contact between the stator and the rotor. Because there is no mechanical contact between the stator and the rotor, the rotor of the magnetic suspension bearing can reach a high operating speed, and has the advantages of small mechanical wear, low energy consumption, long life, no lubrication, no pollution, etc., especially suitable for high speed , vacuum and ultra-clean and other special applications. [0003] At present, magnetic bearings are divided into the following types according to the way the magnetic force is prov...

AI Technical Summary

Problems solved by technology

[0004] At present, there are three structural forms of permanent magnet bias axial magnetic bearings researched internationally. One is to place permanent magnets in the rotor, which increases the difficulty of installation and limits its high-speed operation; the second type of magnetic bearing suspends the rotor. Placed on both sides of the stator, the axial length is long and the critical speed is low; in the third type of magnetic bearing, the axial control magnetic flux passes through the permanent magnet, which has an obvious demagnetization effect on the permanent magnet, and the magnetic flux leakage is large. Efficient applications are limited

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