.png)
This paper presents a novel fast speed response control strategy for the poly-phase induction motor drive system based on flux angle. The control scheme is derived in rotor field coordinates and employs the estimation of the rotor flux and its position. An adaptive notch filter is proposed to eliminate the dc component of the integration of signals used for the rotor flux estimation. To improve the performance of the rotor flux estimator derivative term of the back emf is incorporated in the system. The voltage components in the synchronous reference frame are generated in the controller considering back emf and steady state voltage drops and transformed to stationary reference frame for driving the motor. Simulation of the drive system was carried out and the results were compared with those obtained for a system that produces the above mentioned voltage components using conventional PI controller. It is observed that the proposed control methodology provides faster response than the conventional PI controller incorporated system.