Abstract:
This paper presents a novel economic
variable voltage high-frequency PWM direct AC to AC
voltage controlled three phase induction motor drive. The
drive consists of one main switch and three auxiliary
controllable switches with AC freewheeling technique and
adjustable dead-band between switches. This scheme would
be useful for various Industrial drives for high power fans,
pumps and blowers coupled to a three-phase induction
motor. The proposed drive reduce the motor current
thereby decreases the losses and improves the input power
factor simultaneously with the reduced number of
controllable switches as compared to conventionally used
VVVF drive.
