Space vector pulse width modulation method for multiphase motor fault

Abstract

The invention discloses a space vector pulse width modulation method for a multiphase motor fault, and belongs to the technical field of motor control. The invention aims to solve the problem that the common-mode voltage cannot be inhibited by the existing fault-tolerant control method in the case of the open-phase fault of the motor. A novel space voltage vector diagram is obtained by adopting a magnetomotive force conservation principle before and after phase failure and taking maximum torque output as a constraint condition, ten non-zero voltage vectors with the maximum amplitude and the minimum common-mode voltage amplitude are selected, the space voltage vector diagram is divided into ten sectors, sector judgment is carried out on the reference voltage vector, the action sequence of all basic voltage vectors is determined with the minimum number of switching tubes acting each time as an optimization target, and the action sequence and action time of the basic voltage vectors are calculated. According to the invention, the operation performance of the multi-phase motor in a fault state is obviously improved, and the reliability of a speed regulation system is effectively improved.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a space vector pulse width modulation method for multi-phase motor faults. Background technique [0002] Multiphase permanent magnet synchronous motor (PMSM) has been widely used in various industries in recent years because of its performance advantages such as low voltage, high power, high efficiency, fault tolerance, and low noise. At the same time, with the development of microelectronics and modern power electronics technology, fault-tolerant technology has been widely used in many application fields with high reliability requirements. At present, for the fault-tolerant control strategy of multi-phase PMSM, the traditional fault-tolerant control methods are mostly hysteresis control and direct torque control (DTC), but these two methods do not consider the problem of common-mode voltage, which will induce A high-amplitude shaft voltage is generated and a shaft current is formed...

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Problems solved by technology

At present, for the fault-tolerant control strategy of multi-phase PMSM, the traditional fault-tolerant control methods are mostly hysteresis control and direct torque control (DTC), but these two methods do not consider the problem of common-mode voltage, which will induce A high-amplitude shaft voltage is produced, and a shaft current is formed, causing rapid damage to the motor bearing and shortening the service life of the motor

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