A Method of Improving the Stability of the DTC Flux-weakening Control for Permanent Magnet Synchronous Motor

摘要

To expand the speed adjustable range of PMSM and improve the stability of flux-weakening operation, a flux-weakening control method with amplitude limit of torque angle was presented. It will conduct real-time observation of the torque angle, control the output zero vector of inverter and directly control the amplitude of torque angle, so that the torque angle will be within the allowable range and the motor will run steadily. This method inherits the rapid dynamic response and good robustness of direct torque control. Simulation results have verified the feasibility and effectiveness of the method.