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Comparison of AC Choppers Fed Single Phase Induction Motor Close Loop Characteristics.

M. Narendra Kumar, K.S.R. Anjaneyulu, P. Sujatha.

This paper presents comparison of closed loop results of single, two and four switch AC Chopper fed single phase induction motor. The Dynamic response of open loop system is poor. Closed loop system is used to improve the dynamic response. This paper deals with modeling and simulation of one switch, two switch and four switch AC Chopper fed single phase induction motor drives. The pulse width modulated AC chopper fed single phase induction motor is implemented using an Atmel 89C51 microcontroller. The intention is to save energy in operations using induction motors. At no load, 70% of the energy can be saved that decreases with an increase in the load. From the simulation results, it is seen that the pulse width modulated (PWM) AC chopper system has lesser harmonics than the phase controlled AC chopper system, and hence it is used in the present work. Closed –loop control scheme to implement the energy–saving in the single phase induction motor drive system is designed and presented. The possibility of energy saving is explored in loads like cutting, punching and drilling operations, where most of the time induction motors runs at no load.

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