Integral-cycle control with a d.c. chopper controller for single-phase induction motor

This paper describes a new drive for single-phase induction motors. This new drive employs a single controlled device to operate as a d.c. chopper switch which may be a GTO or a thyristor. The chopper switch is actuated to effect integral-cycle control for the voltage applied on the motor. The proposed drive is not only suitable for integral-cycle control but it is also suitable for frequency control as well as phase-angle control. With such a scheme, the single-phase induction motor is able to exhibit a wide speed range; a property which it does not normally possess. The study includes theoretical and experimental results.