A Novel Fault-Tolerant Control for Five-Phase Fault-Tolerant IPMSM Considering Reluctance Torque

This paper proposes a new fault-tolerant control for five-phase fault-tolerant interior permanent-magnet synchronous motors (FTIPMSM) with the open-end winding topology, which can ensure the smooth torque output even in phase open-circuit/short-circuit fault conditions. The fault tolerant control consists of improved optimal torque control (OTC), drag torque estimation, and deadbeat predictive current control (DBPCC). The improved OTC is proposed to generate the non-fault phase current command considering the reluctance torque, which can guarantee the constant torque output in postfault conditions. The drag torque estimation is proposed to estimate the drag torque caused by short-circuit current, which can modify the torque model in the improved OTC. The DBPCC is proposed to ensure phase current tracking performance. The resulting fault tolerant control can guarantee the excellent control performance of the five-phase IPMSM both in healthy and postfault conditions, which is also verified by simulations.