Experimental Direct Torque Control Induction Motor Drive with Modified Flux Estimation and Speed control Algorithm

An enhancement in dynamic performance of a traditional direct torque control (DTC) drive can be achieved by a robust speed control algorithm while the steady state performance depends upon an efficient flux estimation algorithm.In this paper a conventional PI controller in the speed control loop is replaced by a sliding mode speed controller and a modified low pass filter based digital integration algorithm with tunable cut off frequency is proposed for flux estimation.The proposed study is investigated through simulation and experimentally validated on a test drive.