부하토크 피드포워도 제어를 이용한 유도전동기의 속도제어

This thesis proposed a speed control system for induction motors robust to variations in torque and parameters by feeldorward compensating the current portion of load torque adding a load torque observer to the conventional PI controller in the indirect vector controlled induction motor system. In conclusion, this thesis demonstrate the improved transient characteristic to variations in reference speed and load torque, compared to the conventional PI control method, by means of the feedforward control of the estimated load torque.