DISTURBANCE-FREE OPERATION OF A MULTIPHASE CURRENT-REGULATED MOTOR DRIVE WITH AN OPENED PHASE

Although design of induction motor drives employing field oriented con trol has reached a relatively mature state, relatively little effort h as been directed toward improving the reliability of these drives. In this paper, a new, improved induction motor control strategy is propos ed incorporating a multiphase machine that allows for continuous, dist urbance-free operation of the drive even with complete loss of one (or more) legs of the inverter or motor phase. A complete analysis of bot h an even phase and an odd phase machine utilizing this new control an d circuit concept is included.