Unity Power Factor Three Phase Induction Motor Drive Using Combined Extinction Angle and PWM Controlled Technique

Power saved is power generated. The proposed topology is aimed at minimizing overall power loss and improving input power factor of three phase induction motor drive at any load. Direct AC to AC voltage control technique has been adopted. The proposed technique executes combination of extinction angle and pulse width modulation control strategies. Combination of the technique provides independent control over power factor and speed of the three phase induction motor. Proposed project has introduced the four switch topology that contributes in simple control and cost effective drive. The drive runs induction motor near unity power factor for any speed. It uses AC freewheeling. Drive possesses applications for controlled cooling purpose in industries and power plants. The simulation results for the proposed topology is found using MATLAB software. The simulation results are validated with the results of the hardware model of the drive. The hardware model with results for control circuit and power circuit is presented.