Open-Phase Fault Tolerant Finite Control-Set Model Predictive Torque Control of IPMSM for Reduced Torque Ripple and MTPA Operation

Open-phase fault failures in Interior mounted Permanent Magnet Synchronous Machine (IPMSM) drives tend to cause overall performance degradation. Remediation strategies to provide post-fault operation with regulated torque require feeding strategy adaptation. In this matter, this paper proposes a fault-tolerant Finite Control-Set Model Predictive Torque Control (FCS-MPTC) for three-phase nonsinusoidal IPMSM under open-phase fault. Differently from usual current control based approaches, the cross product instantaneous power theory analysis is employed to elucidate active and reactive torque control quantities as consistent control goals in the post-fault condition in order to achieve smooth torque production and Maximum Torque per Ampere (MTPA) operation. The validity of the proposed method is verified by comparison to previous methods under both steady and transient state in an open-end winding IPMSM drive.