A Fault-Tolerant Control System for Switch Opening Faults Used in Magnetic Suspension Bearings

Abstract

The invention discloses a fault-tolerant control system for a switch disconnection failure of a magnetic suspension bearing, which belongs to the field of magnetic suspension bearing control and includes: a common bridge arm, N non-common bridge arm groups, a DC power supply and a control unit, where N is the central axis of the magnetic suspension bearing The number of the number; each non-common bridge arm group includes two parallel bridge arm branches, the connection point between the upper and lower bridge arms in each bridge arm branch and the connection point of the upper and lower bridge arms in the public bridge arm Windings are arranged between them; the control unit is used to control the conduction of the upper bridge arm of one bridge arm branch and the lower bridge arm of the other bridge arm branch in each non-common bridge arm group, and in any non-common bridge arm group Cutting off the conducting bridge arm when an open-circuit fault occurs in the conducting bridge arm, and controlling the originally disconnected bridge arm in any non-common bridge arm group to switch to the conducting state. The electromagnetic force in the corresponding direction of the faulty bridge arm group can be quickly restored to a stable value, preventing the rotor from falling, and does not affect the electromagnetic force in other directions, thereby improving the fault redundancy capability of the magnetic bearing system.

Description

technical field [0001] The invention belongs to the field of magnetic suspension bearing control, and more specifically relates to a fault-tolerant control system for a switch disconnection fault of a magnetic suspension bearing. Background technique [0002] Magnetic suspension bearing is a bearing device that uses electromagnetic force generated by the stator to levitate the rotor. As a substitute for traditional mechanical bearings, it can realize non-contact operation between the rotor and the stator. There is no mechanical contact between the rotor and the stator of the magnetic suspension bearing, no lubrication is required, there is no friction, and the working life is long. Magnetic suspension bearings are widely used in applications where the rotor needs to rotate at high speed or has high requirements on the working environment. Magnetic bearings mainly include passive magnetic bearings, active magnetic bearings and hybrid magnetic bearings. For the magnetic susp...

AI Technical Summary

Problems solved by technology

However, there is no device redundancy in the current reverse common-bridge topology of the magnetic suspension bearing, and it does not have fault-tolerant operation capability. When the switching device breaks down, the magnetic bearing rotor will fall and cannot work normally, which is not conducive to the stable operation of the magnetic suspension bearing.

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