Direct Flux and Torque Control of Induction Motor Drive Changing the Hysteresis Band Amplitude

Abstract: Direct Flux and torque control (DTC) based speed control strategy of induction motor (IM) drive and the effect of flux and torque hysteresis band amplitude on this strategy is presented. This scheme is simple and provides a good dynamic response. But the major problem associated with this DTC drive is high torque along with stator flux ripples. The direct torque control of induction machine is based on the use of two hysteresis controllers. The scheme for a 5 hp IM drive is simulated by changing the hysteresis band amplitude.

Keywords: DTC, hysteresis controller, induction motor drive, stator flux ripples, torque ripples, voltage source inverter (VSI).