Fault-tolerant control of five-phase PM machines with pentagon connection of stator windings under open-circuit faults

In this paper, a fault-tolerant control technique for five-phase permanent magnet machines with pentagon connection of stator windings is presented. Open-circuit faults in machine winding as well as inverter switches are analyzed by the proposed control technique. The proposed control technique ensures continuous operation of the machine while producing minimum stator ohmic loss and minimum torque ripple. In addition to single-phase and double-phase faults, triple-phase faults are also considered in pentagon connection. Experimental results for a five-phase PM machine are provided to demonstrate the proposed fault-tolerant control strategy.