INTEGRAL-CYCLE CONTROL WITH A DC CHOPPER CONTROLLER FOR SINGLE-PHASE INDUCTION-MOTOR

This paper describes a new drive for single-phase induction motors. Th is new drive employs a single controlled device to operate as a d.c. c hopper 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 i s able to exhibit a wide speed range; a property which it does not nor mally possess. The study includes theoretical and experimental results . (C) 1997 Elsevier Science S.A.