Short circuit fault tolerant control method for five-phase fault tolerant permanent magnet motor

Abstract

The invention discloses a short circuit fault tolerant control method for a five-phase fault tolerant permanent magnet motor. The method comprises the following steps: establishing a five-phase fault tolerant permanent magnet motor model; compensating a short circuit fault phase normal torque loss by using non-fault phase current by directly adopting a compensation strategy of an open fault; compensating the fluctuated magnetic motive force caused by the short circuit fault phase current by using non-fault phase current, so that the synthetic magnetic motive force is zero; eliminating torque ripple caused by the short circuit current; synthesizing the vectors of the compensating current of the steps 2 to 3 to obtain the short circuit fault tolerant current; performing control and simulation on Maxwell short circuit fault tolerant. According to the short circuit fault tolerant control method for the five-phase fault tolerant permanent magnet motor, one-phase short circuit fault tolerant control is performed on the motor according to the specific situation of the no-load counter electromotive force of the motor, so that the fault is equivalent to the output torque in a normal operating state; the torque ripple is reduced; the operation of the five-phase fault tolerant permanent magnet motor with a short circuit fault is realized.

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 military, industrial and other fields, stable and reliable motor drive systems are particularly important for occasions with high reliability requirements such as aircraft and electric vehicles. To achieve system requirements through fault-tolerant control, improve system reliability, and reduce or avoid losses caused by failures has become the key to ensure system reliability. Therefore, fault-tolerant permanent magnet motors and high-reliability fault-tolerant control methods have received extensive attention. [0003] S...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the control problem of the existing five-phase fault-tolerant permanent magnet motor during short-circuit fault operation

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