Fault diagnosis method of permanent magnet fault-tolerant motor driving system

Abstract

The invention discloses a fault diagnosis method of a permanent magnet fault-tolerant motor driving system. The method comprises the steps of firstly, constructing a permanent magnet fault-tolerant motor driving system, and completing construction of all modules and integration of a whole driving system; then collecting each phase of current of the two sets of armature windings, obtaining each phase of high-frequency current signal through a filter, and injecting a high-frequency square wave current signal into the d axes of the two sets of armature windings to obtain q-axis high-frequency voltage response; carrying out amplitude extraction on the q-axis high-frequency voltage response and the high-frequency current signals of each phase to obtain corresponding amplitudes, and carrying outmotor winding open-circuit fault diagnosis according to a motor winding open-circuit fault diagnosis criterion of the permanent magnet fault-tolerant motor driving system; and finally, according to the motor winding open-circuit fault positioning criterion of the permanent magnet fault-tolerant motor driving system, positioning a specific position where a fault occurs. The method is simple and easy to implement, high in reliability and short in fault diagnosis time, and the stability and robustness of the motor driving system are improved.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of permanent magnet fault-tolerant motors, in particular to a fault diagnosis method of a permanent magnet fault-tolerant motor drive system. Background technique [0002] With the development of multi-electric, all-electric aircraft and hybrid and pure electric vehicles, the motor drive system has ushered in new development opportunities and challenges. In addition to requiring high power density and high efficiency, it also needs to have high output performance and high reliability at the same time. performance, which has become the crux of the motor drive system. In the 1990s, the emergence of permanent magnet fault-tolerant motor and its control system improved the safety and reliability of the system, and has now been applied to the aviation field. However, due to the influence of electromagnetic interference, insulation aging, poor contact and other factors, some electrical faults o...

AI Technical Summary

Problems solved by technology

In the past electric drive system, most open-circuit fault diagnosis methods lack sufficient theoretical basis and algorithm innovation, so common open-circuit fault diagnosis methods often have false alarms under different load and speed conditions, and there is also a long diagnosis time. , a large number of sensors, and a large number of electrical equipment lead to more complex system design

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