A single phase input cycloconverter driving a three phase motor

The paper presents a 1-phase to 3-phase cycloconverter suitable for driving an induction motor. The input of the cycloconverter is a single phase supply of 240 V, 50 Hz, and its output is a 3-phase supply with variable voltage and variable frequency (VVVF) up to 25 Hz. Using a double integral control technique, a 1-ph to 3-ph modulation method is proposed so the motor flux follows a sinusoidal reference. Only six naturally commutated triacs are used in the power circuit, so the resulting cycloconverter-motor drive is cheap, compact, and efficient. Software in C has been written for both simulation and real time control. The simulation is used to predict the performance of the cycloconverter and induction motor