Fault tolerant control of five-phase AC motor drive

This paper investigates the voltage and current control of a five-phase induction motor drive under fault conditions. The control strategies allow for continuous and disturbance free-operation of the drive without any additional hardware connections at the occurrence of complete loss of one or two legs of the inverter or motor phases. The control presented here is oriented to open loop torque control strategies (e.g., Volts/Hz control), but can be very useful for direct torque control or even field oriented control strategies. A complete analysis of voltage and current controls are presented. Experimental and simulation results demonstrate the validity of the proposed systems.