Open-Circuit Fault-Tolerant Control for a Five-Phase Permanent Magnet Synchronous Machine Drive

In this paper, open-circuit fault-tolerant current control for a five-phase permanent magnet (PM) machine is proposed based on the theory of eliminating pulsating components in the resultant magneto-motive force (MMF) under faulty condition. According to the principle, new current sets are derived by adding an additional current component to each remaining healthy phase to maintain a smooth total torque by eliminating pulsating parts of the resultant MMF for the five different open-circuit faults. The remaining healthy phase currents are obtained for a single-phase, double-phase and three-phases open-circuit fault conditions. The proposed fault-tolerant control strategy is validated by finite-element analysis (FEA). This fault-tolerant control method can be applied to any multi-phase PM machines.