Active and passive magnetic gas hybrid bearing

Abstract

The invention discloses an active and passive magnetic gas hybrid bearing. The active and passive magnetic gas hybrid bearing is a hybrid bearing suspension bearing which is composed of a stator 1, acoil 4, a permanent magnet 5, a gas foil bearing 13 and an auxiliary supporting structure, namely a left insulating liner 2 and a right insulating liner 3, wherein the coil is wound around a magneticpole 9, the permanent magnet 5 is installed at a magnetic pole gap 10 close to the center position, and the permanent magnet and an electromagnetic magnetic circuit are kept in the same direction; andthe gas foil bearing 13 is installed on a bearing base composed of the left insulating liner 2, the right insulating liner 3 and the permanent magnet 5 and is fixed through a cylindrical pin 8. The active and passive magnetic-gas hybrid bearing has the comprehensive characteristics of an active magnetic suspension bearing, a passive magnetic suspension bearing and a foil bearing; a magnetic fieldgenerated by a permanent magnet 8 replaces a static bias magnetic field of an electromagnet, so that the power consumption of a power amplifier is remarkably reduced; when a rotor rotates at a low speed, the permanent magnet 8 and a electromagnetic bearing provide load, and when the rotor rotates at a high speed, the foil bearing 13 and the permanent magnet 8 provide load, and the electromagneticbearing provides extra dynamic rigidity and damping to realize adjustment of bearing capacity of the bearing and improvement of stability.

Description

technical field [0001] The invention relates to an active control bearing, in particular to an active and passive magnetic-air hybrid bearing. Background technique [0002] The gas foil bearing is a kind of fluid film lubricated bearing that uses ambient gas as the lubricating medium, and the rotor is suspended on the gas film by the dynamic pressure effect. The elastic support structure in the gas foil bearing provides stiffness and damping to the bearing through elastic deformation and Coulomb friction. Non-contact lubrication enables the bearing to run stably for a long time under high temperature and high speed conditions, prolonging its service life. However, due to the low viscosity of the lubricating medium, the bearing capacity of the gas foil bearing is insufficient during the start-up and stop phase of the equipment, resulting in dry friction between the rotor and the bearing at low speed. [0003] Active magnetic suspension bearing is an active control bearing t...

AI Technical Summary

Problems solved by technology

However, it is impossible to obtain a stable balance only by using passive magnetic suspension bearings. Generally, an external force must be introduced in at least one direction to achieve system stability.

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