Abstract—This paper investigates the performance of model predictive current control (MPCC) under single-phase open-circuit conditions in the open-end winding six phase permanent magnet synchronous motors (PMSM). A duty ratio optimization (DRO) based on QPR controller is proposed for the first time. After the fault occurs, the QPR controller automatically corrects the duty ratio, mitigating control errors caused by vector shifting. This correction is achieved without the need of complex reconfiguration, fault diagnosis, or current reference adjustments. The proposed method is applicable to open-circuit faults (OCF) in any phase, simplifying the fault-tolerant strategy. The transition from the healthy to the postfault operation can be improved, meanwhile, both steady-state and dynamic performance in prefault and postfault situations can be guaranteed. Extensive experimental results verify the effectiveness of the proposed method.

Model predictive control, fault-tolerance, six-phase PMSM, duty ratio optimization.,Virtual voltage vector