Fault Tolerance for Phase Open-circuit and Power Electronic Switch Disconnection in PMBDC Motor by Adding Extra Parts to Inverter

Abstract

This paper presents a circuit model of permanent magnet brushless direct current motor in which it is possible to simulate the phase open circuit faults and access the center of star-connected three-phase winding. The remedial strategies are introduced for the open-circuit of phase and power switch disconnection. The control system with two added electronic switches to the inverter can control the faulty motor such that a positive desired torque is developed. In this method a single phase is excited during the fault over some periods. The output of the faulty motor is lower than that of the healthy motor.