Auxiliary bearing system suitable for magnetic levitation bearing-rotor system

Abstract

The invention provides an auxiliary bearing system suitable for a magnetic levitation bearing-rotor system. The auxiliary bearing system includes a rolling bearing (2), an elastic supporting part (8)for supporting the rolling bearing, a controllable oil film (7) formed by a magnetic liquid, an exciting coil (5), a coil frame (6) made of a non-permeability-magnetic material and fixing the coil, elastic seal (3) and a control device (11). The rolling bearing (2) is mounted on the elastic supporting part (8), and a bearing inner ring directly bears the impact of rotor falling and supports a rotor to rotate after the rotor falls. The auxiliary bearing system uses the elastic supporting part to support an auxiliary bearing, and the stiffness of the elastic supporting part can be pre-selected according to the characteristics of different rotor systems such as weight and rotating speed so as to provide optimal support stiffness after the rotor falls or collides with the auxiliary bearing.

Description

technical field [0001] The invention belongs to the technical field of mechanical design and automatic control, and in particular relates to an auxiliary bearing system suitable for a rotor system of a magnetic suspension bearing. Background technique [0002] Due to the advantages of no friction, no lubrication, high rotor speed, and active control of rotor behavior, magnetic suspension bearings have been gradually used in industry, aerospace and other fields in recent years. Due to the instability of electromagnetic attraction and the relatively weak carrying capacity of rolling and sliding bearings, the rotor system using magnetic suspension bearings is equipped with auxiliary bearings (or backup bearings, Backup bearings) to prevent overloading or failure of magnetic suspension bearings. When the rotor falls, the magnetic suspension bearing body and even the entire rotor system will be damaged. [0003] In today's magnetic suspension bearing application systems, rolling...

AI Technical Summary

Problems solved by technology

On the one hand, after the rotor rotates at high speed and falls, it will generate a huge impact load on the auxiliary bearing. On the other hand, the auxiliary bearing itself has very small damping, so that the impact of the rotor falling is almost completely absorbed by the rotor itself and the base, which will affect the rotor and the inner ring of the auxiliary bearing. The contact surface and the entire rotor system will be damaged. If the rotor is operated under high-speed and heavy-load conditions, the consequences of its fall will be more serious

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