Seven-Phase PMSM Drives Operation Post Two Types of Faults

Abstract

This research presents a seven-phase PMSM drive with a high degree of reliability. This enhancement in reliability is achieved by applying two new Fault Tolerant Control techniques (FTC) at the same time. The first FTC will maintain the operation of the seven-phase PMSM drive after the failure in one based on the minimum inverter current optimization technique. The implementation of this FTC technique is achieved through developing a novel Space Vector Pulse Width Modulation (SVPWM) to assure proper distribution of the currents in the remaining phases post failure. The second FTC technique keeps the operation of the faulty seven-phase PMSM drive post the failure in the speed sensor. This is created by developing a new algorithm to obtain the rotor position and speed of the faulty seven-phase PMSM drive based on the voltage excitation method. Simulation results are presented to demonstrate the enhancement in the reliability achieved by the FTCs developed in this paper for the seven-phase motor drive running post the failures in phase ‘A’ and the speed sensor at the same time.