DEVELOPMENT OF DIRECT TORQUE CONTROL MODELWITH USING SVI FOR THREE PHASE INDUCTION MOTOR

Direct torque control method is one of the best control strategies which allow a torque control in steady state and transient operation of induction motor. The main aim of direct torque control strategies is to effectively control the torque and flux of induction motor. Direct torque control method made the motor more accurate and fast torque control, high dynamic speed response and simple to control. This paper present the principle of the direct torque control for voltage source inverter fed induction motor drive, and switching table, amplitude selection of the hysterics band of torque and flux. And also this method based on space vector modulation and it's considered as an alternative to field oriented control technique. Direct torque control methods are the first technology to control the 'real' motor control variable of torque and flux. And it has also more advantage such as it not required a feedback device and also not need external excitation. The performance of direct torque control method has been demonstrated by simulation using a simulation package in matlab.