Low power consumption axial magnetic bearing with redundant structure

Abstract

A low power axial magnetic bearing with redundant structure is characterized in that it is composed of bearing body, exciting coils, permanent magnet, magnetic ring, air gap, auxiliary air gap and suspension body. The permanent magnet clings to the bearing body to generate bias flux, the magnetic ring clings to the permanent magnet and forms the auxiliary air gap with the bearing body, the air gap is formed among the magnetic ring, the bearing body pole and the suspension body to generate bias flux, the bearing body is winded with two groups of the exciting coils to generate control flux, the exciting coil, the permanent body and the magnetic ring are formed to redundant axial magnetic bearing stators relative to each other. The invention realizes the redundancy for the structure of the permanent bias axial magnetic bearing, prevents the electromagnetic magnetic path from passing the internal part of the permanent body, and reduces the exciting current. The invention has high reliability and low power consumption, and can work as non-contact support for the rotating components in the flywheel and other devices.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a low-power axial magnetic bearing with a redundant structure, which can be used in systems such as magnetic suspension flywheels, magnetic suspension control moment gyroscopes, aeroengines, molecular pumps, high-speed machine tools and satellites Contact-free support for rotating parts. Background technique [0002] Due to the advantages of non-contact, no lubrication, long life, low noise and high control precision, the magnetic suspension bearing can be widely used in aviation, aerospace and mechanical processing and other fields. In fields requiring high reliability such as aero-engines and spacecraft, in order to improve the reliability of the magnetic suspension bearing system, the magnetic suspension bearing system is required to have redundancy and fault tolerance functions. The permanent magnet bias axial magnetic bearing of the existing structure uses a perm...

AI Technical Summary

Problems solved by technology

The permanent magnet bias axial magnetic bearing of the existing structure uses permanent magnets to generate the bias magnetic field, but it cannot achieve redundancy, so the reliability is low

However, the existing axial magnetic bearing with redundant structure adopts active magnetic bearing structure, that is, two sets of excitation coils are wound in one bearing body to realize redundant structure. The schematic diagram of its structure is shown in Figure 1. When the coil fails, the other excitation coil can work normally. Due to the bias magnetic field generated by the passing current, there is a disadvantage of large power consumption.

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