Abstract: In this study, a four-switch inverter is adopted as a fault-tolerant topology for a traditional six-switch voltage-source inverter. We developed a dynamic model of a three-phase four-switch inverter permanent magnet synchronous motor (PMSM) based on our analysis of the operation mode of a drive system. This paper presents a model predictive torque control strategy for the three-phase four-switch inverter PMSM drive system. The influence of capacitor voltage imbalance is reduced using a voltage suppression method. The simulation results demonstrate that the fault-tolerant PMSM drive system that adopts the abovementioned method can run continuously and stably. The results also verify the efficiency and validity of the proposed method.