A COMPARATIVE STUDY OF VECTOR CONTROLLED INDUCTION MOTOR DRIVE USING DIFFERENT SPEED CONTROLLERS

Abstract

The induction motor is superior to the do motor with respect to size, weight, rotor inertia, maximum speed capability efficiency, and cost. However, the case of control of dc motor cannot be equated because the induction motor has a nonlinear control structure, whereas the separately excited dc motor has, a decoupled control structure with independent control of flux and torque. This report describes the technique of field oriented control or vector control which can be used with both induction and synchronous machines and essentially transforms the dynamic structure of the ac machines into that of a separately excited compensated dc motor. As a result, the induction motor drive can achieve four-quadrant operation with a fast torque response and good performance down to zero speed.........................