Evaluation of Vector-Controlled Asynchronous Machines

Abstract

In this paper vector control with variable frequency drive used toapply speed control of a three-phase AC Asynchronous and induction machines.The flux and torque references used to obtain the current components.Proportional-Integral controllers are used to keeping the measured currentcomponents at their reference values. The stator voltage references are theoutput of the PI current controllers. High-performance with the smoothoperation is obtained using the proposed method. The differences can be seen inbehavior dynamic state. When the motor is rotating at full speed with a fullload,it reaches good current waveforms very easily due to the independent PIcontrol of torque and magnitude of flux. In high and sudden variations of thereference input, the direct command is more efficient and less demanding forthe equipment. The expressions of the fundamental variables (speed, torque,flux) and equivalent phase circuit of the machine will be reviewed.