Current Predictive Control-Based Open-Phase Fault-Tolerant Operation Scheme for Open-Winding SPMSMs

Open-winding permanent magnet synchronous mo-tors (OW-PMSMs) have attracted increasing attention in trans-portation applications due to their inherent fault-tolerant (FT) ca-pability. However, existing FT control strategies typically face a trade-off between control performance and implementation effi-ciency. This paper proposes a predictive-control-based post-fault management scheme in the stator phase domain for surface-mounted OW-PMSMs under single-phase open-circuit faults. A normalized phase-current-residual-based diagnostic method is first developed to enable reliable fault localization and fast transi-tion to FT operation, with a detection time of approximately 10% of an electrical cycle. A mutual-inductance-aware FT predictive control (MIFTPC) strategy is then established to improve post-fault current and voltage prediction accuracy, thereby enhancing torque control quality under FT operation. In addition, a unified phase-domain framework directly maps predicted phase voltages to sector selection and dual-inverter switching states, avoiding co-ordinate transformations and complex coordinated modulation while simplifying implementation. Experimental results on a 0.4-kW OW-PMSM drive (rated speed 1000 r/min, rated torque 4 N·m) demonstrate the effectiveness of the proposed method under vari-ous conditions. Relative to a mutual-inductance-neglecting method, the proposed approach reduces current deviation and torque rip-ple RMS by approximately 21.8% and 34.6%, respectively.