Analysis of the stator flux linkage in permanent magnet synchronous motor direct torque control for EV

This paper discusses the relationship between the amplitude of stator flux linkage and the torque of interior permanent magnet synchronous motor (IPMSM). In order to change the load angle and the torque accordingly, the amplitude of stator flux linkage should be kept in restricted range. It also explains how to control the amplitude of stator flux linkage to get maximum torque by using direct torque control (DTC) under base speed, which improves the efficiency of the whole system. Simulation results have been presented and good performance has been achieved.