Single Phase Induction Motor In Energy Efficient Mode

In this paper, a new model for single phase Induction motor is presented. A microcontroller based control scheme using pulse width modulation technique is developed .Single phase induction machine is most widely used in industry because of its simple construction, reliable operation, lightness and cheapness. In modern cities, motor drive systems can consume over half the electricity. Furthermore, those systems can consume over 75% of all the electricity in an industrial plant. Linecommutated AC controllers can be replaced by pulse width modulation (PWM) AC choppers, which have better overall performance and the above problems can be improved if these controllers are designed to operate in the chopping mode. In this case, the input voltage is chopped into segments and the output voltage level is decided by controlling the duty cycle of the chopper switching function. Using the proposed scheme, the voltage at the sta¬tor terminals is reduced during no load or small duty ratio load conditions, and electrical energy is saved.