Performance Comparison of Two-leg and Three-leg AC Voltage Controller-Fed Three Phase Induction Motor Drive

This paper gives the comparison of the starting performance of three phase induction motor fed from three-leg and two-leg ac voltage controller. Optimum firing angles are obtained for both the systems by considering various electrical characteristics like maximum positive and negative torque pulsations, peak starting current and acceleration time. Two group of induction motors are utilized for comparative analysis of performance with the selected optimum firing angle. Result shows that the performances of both the systems are on par. Thus the cost effective, two-leg controller is the better choice for the induction motor starting.