Performance and simulation of a single-phase-to-2-phase cycloconvertor motor drive

The paper discusses the simulation, performance and optimum design of single-phase-to-2-phase cycloconvertors driving an induction motor. Bridge and centre-tapped circuits using triacs with double-integral control are considered. Results are presented for 2-pole induction-motor drives which may operate at speeds from 0 to 1500 rev/min. The simulation is shown to model the performance of the drives successfully, and is used to predict an optimum design. An improvement to the control algorithm at bank crossover is presented. The bridge circuit is more efficient than the centre-tapped circuit, but uses more triacs.