Abstract: This paper proposes a deadbeat predictive torque control strategy suitable for high-speed and low frequency ratio operations of permanent magnet synchronous motors. To reduce the prediction error caused by the change of rotor position under low frequency ratio, a new discrete prediction model is constructed by directly solving the differential equations with the help of an auxiliary coordinate system. Based on the new model, the control quantity calculation expressions and one-step delay compensation method of deadbeat torque control are proposed. According to the mathematical relationship between flux and load angle difference in the auxiliary coordinate system, the torque prediction value can be obtained directly by using flux prediction value. Furthermore, to reduce the adverse effect of motor parameters' mismatch on torque control, the torque feedback value is calculated by the formula method during the transient operation, and is calculated by the power conservation method during the steady-state operation. Experimental results show that the proposed method is feasible and effective. Compared with the traditional method, the proposed method has less model error under low frequency ratio condition, more accurate prediction and control of torque and flux, and thus it has certain robustness to motor parameters.