An improved robust field-weakening control algorithm for direct torque controlled IPM synchronous motors

Direct torque control has been widely accepted as a simple but effective control method for AC motor drives. It is robust to parameter variations since only stator resistance is used in the algorithm. However, to obtain high performance motor drives, the stability and robustness of direct torque control in the field-weakening region must be guaranteed. Some of the existing research proposals are parameter dependent. This paper proposes an improved robust field-weakening control algorithm for direct torque controlled IPM synchronous motors. The effectiveness of the proposed method is validated by simulation results.