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 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.-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　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.