A short-circuit fault-tolerant control method for a five-phase permanent magnet motor

Abstract

The invention discloses a novel short-circuit fault tolerance control method of a five-phase permanent magnetic motor. The method comprises the following steps: a five-phase fault tolerance permanent magnetic motor mode is established; when a certain phase of a motor generates a short-circuit fault, due to existence of short-circuit currents, the short-circuited phase generates a torque ripple which is different from what it is like under a normal condition yet the frequency and the phase of which can both be determined, through changing phases of currents of other normal phases, all the normal phases can each generate a torque ripple having the same frequency and phase as the short-circuited phase; then amplitude of the currents of other normal phases is changed, a torque ripple vector sum generated by rotation of each phase is enabled to be zero, and at the same time, it has to be satisfied that a finally synthesized average torque is equal to the normal condition; and then simulation analysis is carried out. According to concrete conditions of motor zero-load counterelectromotive forces, one-phase short-circuit fault tolerance control is performed on the motor, the fault is enabled to be equalized with output torque output under a normal operation state, the torque ripple is reduced, and the five-phase fault tolerance permanent magnetic motor can run with the short-circuit fault.

Description

technical field [0001] The invention relates to a fault-tolerant control method for a short-circuit fault of a motor, in particular to a control method for a five-phase fault-tolerant permanent magnet motor. It is suitable for occasions that have high requirements on the reliability and continuity of the motor, such as aerospace and electric vehicles. Background technique [0002] With the continuous expansion of the application of motor drive systems in various fields such as military and industry, stable and reliable motor drive systems have become especially important for occasions requiring high reliability such as electric vehicles and aircraft. To improve the reliability of the system through fault-tolerant control and reduce or even avoid the loss caused by failure has become the key to ensure the reliability of the system. Therefore, fault-tolerant permanent magnet motors and simple and effective reliability fault-tolerant control methods have received extensive att...

AI Technical Summary

Problems solved by technology

[0004] At present, the research on fault-tolerant control methods of fault-tolerant permanent magnet motors is mostly focused on open-circuit faults, while there are few fault-tolerant control algorithms for short-circuit faults and the calculation process is complicated, so the present invention proposes a new simple fault-tolerant control method for short-circuit faults , while greatly reducing the complexity of the algorithm, it also ensures the reliability and fault tolerance of the system

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