Abstract

This paper presents the speed control of an induction motor using nonlinear current control in rotating coordinates. Two hysteresis comparators and the position of the motor flux are used to generate directly the gate pulses for the power transistors of the inverter. This field oriented control method is compared with direct torque control and it is concluded that both control methods, although being conceptually different, have very similar features in terms of structure and performance. Experimental results confirm the high quality of the control reached with this control strategy.