Abstract: When a five-phase interior permanent magnet fault-tolerant motor（IPMFTM） operates under a short-circuit fault, the existing i_d=0 fault-tolerant control strategy cannot use the reluctance torque of the motor and cannot maintain the high torque output. Therefore, a new short-circuit fault-tolerant control strategy based on virtual signal injection controlmaximum torque per ampere（VSIC-MTPA） was proposed. Firstly, the fundamental reduction matrix was derived based on the principle of maintaining the fundamental magnetomotive force pre-and post-fault, and the fundamental decoupling model under fault was constructed. Secondly, the relationship between the phase short-circuit current and its back-EMF was used to obtain the voltage that suppresses the influence of the short-circuit current. Finally, the MTPA factor under fault tolerance control was obtained by injecting a virtual highfrequency signal, so that the motor operates at the maximum torque point. The correctness and feasibility of the theoretical analysis was verified by measuring the dynamic and static characteristics of a 20-slot/14-ploe IPMFTM under fault operation.