Fault diagnosis method with fault-tolerant control of switch reluctance motor position sensors

Abstract

The invention discloses a fault diagnosis method with fault-tolerant control of switch reluctance motor position sensors. The fault diagnosis method includes diagnosis and fault-tolerant control on faults of several position sensors and diagnosis and control over fault recovery of the several position sensors. The fault diagnosis method can timely diagnose faults of a position sensor of each phase, switch control algorithms and enable operation states of a switch reluctance motor to be free from influences of the faults of the position sensors, and namely normal operation can continue to remain when the faults of the position sensors happen; when the position sensors recover, whether signals are normal is judged first, if the signals are normal, diagnosis faults recover, original algorithms are switched back, therefore, fault-tolerant capacity of the switch reluctance motor is effectively improved, and great significances are achieved.

Description

technical field [0001] The invention relates to a fault diagnosis method with fault-tolerant control of a position sensor of a switched reluctance motor, belonging to the technical field of fault diagnosis and fault-tolerant control of a switched reluctance motor system. Background technique [0002] Switched reluctance motor (referred to as SR motor) is a new type of speed-adjustable motor developed by combining power electronics technology, control technology and computer technology with traditional reluctance motor. With its superior characteristics such as flexibility, high operating efficiency, and strong fault tolerance, it has been applied in various fields such as traction transportation, general industry, aviation industry, and household appliances. [0003] The normal operation of the SR motor system requires the rotor position signal. Only through the feedback signal of the position sensor can the control system determine the actual position of the rotor, and then...

AI Technical Summary

Problems solved by technology

However, if you only judge the sequence of edge appearance, one of the cases will not be able to distinguish which phase is faulty, so it is necessary to add an angle detection link, that is, to detect the angle between the new edge and the previous edge for comprehensive diagnosis

Since the operating condition of the motor cannot be determined, and the switched reluctance motor often works in a harsh environment, the angle calculation is inaccurate during acceleration, deceleration or low-speed operation, and the above method will cause misjudgment of faults

At the same time, the above method uses the edges of the three-phase signals alternately. When a certain phase signal fails, the diagnosis strategy needs to be modified accordingly, which makes the diagnosis procedure complicated.

And, when the two-phase signals fail at the same time, the above method will not be able to diagnose

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