ABSTRACT
The technology of direct torque control (DTC) is developing technique of asynchronous motor frequency conversion after technique of vector conversion technique. To a large extent, DTC solves the problem that calculation complicated, character easy to influence by motor parameter. Under low speed condition, influence of voltage drop of stator resistance lead to that flux linkage track happened distortion. Consequently, the track is circle approximately with voltage vector to control. DTC is useful for permanent magnet synchronous motor (PMSM) and can improve rapid torque respond. In order to get great control effect of motor torque and flux linkage, this paper uses Matlab/Simulink to model and simulate, and analyze control performance with simulation results. The results indicate that PMSM can operate smoothly under low speed condition.
