Method for on-line fault diagnosis and fault-tolerant control of position signals of switch reluctance motor

Abstract

The invention provides a method for on-line fault diagnosis and fault-tolerant control of position signals of a switch reluctance motor. A position sensor detects the rotation position of a three-phase 12 / 8 pole rotor in real time, the relative position of the rotor of the motor is determined according to a built-up sequence of three paths of feedback position signals and a trigger edge, then a position angle q of the rotor is calculated, and by combination with a current energizing phase, fault position signals and fault types can be diagnosed in an on-line mode; under the fault state, invalid phase changing actions are rebuilt, correct phase changing operations are conducted, fault tolerance and recovery control over the position signals are conducted, the continuous operation of the motor after the fault is achieved, and the correct cut-in of the position signals when the fault recovery is performed is achieved. The method is convenient to achieve and reliable in operation, in the diagnosis process, the rotor position angle q is amended in each rotor angle cycle, an accumulative error can not be produced, and the accumulative influence on the output performance of a system does not exist; the method can diagnose the fault position signals and the fault types in the on-line mode and enable the system to rapidly recover normal stable operation, and the reliability of the system is improved.

Description

technical field [0001] The invention relates to an on-line fault diagnosis and fault-tolerant control method for position signals of a switched reluctance motor, in particular to a method for detecting position signals when one or two position signals of a three-phase 12 / 8-pole switched reluctance motor are in normal operation. A method for online detection, fault diagnosis, fault-tolerant control and recovery control. Background technique [0002] The position signal of the switched reluctance motor is the judgment basis for the control system to determine the conduction sequence of the phase windings, and it is also the reference signal to ensure the correctness of the winding commutation; at the same time, the position signal is also used as the motor speed feedback signal to realize the speed closed-loop control of the system. Nowadays, photosensitive position sensors are widely used to detect the rotor position, but such sensors are easily affected by harsh environments...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an on-line fault diagnosis and fault-tolerant control method of the position signal of the switched reluctance motor, which is used to solve the problems of inrush current, braking torque and phase loss operation caused by the fault of the position signal of the switched reluctance motor

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