Multiphase machine drives are gaining importance in high-reliability applications due to their fault-tolerance capability and their ability to cope with the postfault operation without any extra electronic components. Predictive current controllers have been recently proposed for managing postfault operation of these drives when an open-phase fault is considered. However, the faulty situation assumes zero stator current while freewheeling diodes can continue conducting in a noncontrolled mode. This work analyzes the postfault operation of the five-phase drive when the freewheeling diodes of the faulty phase are still conducting. Experimental results are provided using a conventional insulated-gate bipolar transistor (IGBT)-based multiphase power converter to quantify the effect of the freewheeling diodes, when an IGBT-gating fault occurs, on the model-based predictive current-controlled drive.
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