SENSORLESS IMPLEMENTATION OF DIRECT TORQUE CONTROLLED INDUCTION MOTOR

Abstract

In the present work performance of direct torque controlled induction motor drive with three different control strategies is investigated. Induction motor is fed from a voltage source inverter. Torque and flux references are generated form speed error and speed of the motor respectively, flux position is detected. These parameters are used to control the motor drive. The three control strategies implemented are normal direct torque control, hybrid direct torque control, split look-up table. All the control strategies were also simulated without speed sensor, which is known as sensorless control. Transient and steady state performance of each control strategy is investigated under different speed references and load conditions. All the control strategies are simulated using MATLAB SIMULINK software package.