Displacement sensor fault-tolerant control system and method for active radial magnetic bearing

Abstract

The invention discloses a displacement sensor fault-tolerant control system and method for an active radial magnetic bearing. The displacement sensor fault-tolerant control system and method are matched with the active radial magnetic suspension bearing; the system comprises a displacement feedback part, a fault diagnosis circuit, a fault-tolerant control module and a feedback execution part, wherein the displacement feedback part is fixedly arranged on the periphery of a rotor of the active radial magnetic suspension bearing in an asymmetric mode; the output of the displacement feedback partis electrically connected with the input of the fault diagnosis circuit and the input of the fault-tolerant control module respectively; the output of the fault diagnosis circuit is electrically connected with the input of the fault-tolerant control module; the output of the fault-tolerant control module is electrically connected with the input of the feedback execution part; and the output of thefeedback execution part is electrically connected with an electromagnetic coil in the active radial magnetic suspension bearing. According to the displacement sensor fault-tolerant control system andmethod, the number of displacement sensors is greatly reduced, the fault types capable of being subjected to fault-tolerant control are increased, and it is ensured that the displacement feedback part can have the same sensitivity and measurement precision before and after the fault.

Description

technical field [0001] The invention relates to a control system and a corresponding control method thereof, in particular to a bearing internal displacement sensor fault-tolerant control system for active radial magnetic suspension bearings and a displacement sensor fault-tolerant control method based on the system, belonging to the technical field of magnetic suspension bearings. Background technique [0002] Magnetic bearing (Magnetic Bearing) is a new type of bearing that uses magnetic force to suspend the rotor in the air so that the rotor and the stator do not touch each other. Its basic working principle is to detect the displacement of the rotor through the displacement sensor, and transmit the displacement information to the controller. The controller performs calculation and outputs the control signal, and the control signal is amplified by the power amplifier into the control current of the electromagnetic coil, thereby generating a corresponding The electromagnet...

AI Technical Summary

Problems solved by technology

However, through practical application, technicians found that displacement self-sensing technology needs to use more filter circuits, which will cause additional phase shift and affect the stability of the system

In addition, this displacement self-sensing technology has low measurement accuracy, poor robustness, and is easily affected by parameter changes. At high frequencies, the displacement estimation error is large, and it is difficult to achieve stable feedback. Therefore, it is difficult for this technology to fundamentally improve the magnetic suspension bearing. system reliability

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