A MAXIMUM TORQUE CONTROL WITH A CONTROLLED CAPACITOR FOR A SINGLE-PHASE INDUCTION-MOTOR

This paper presents a new method to achieve a maximum torque for a single-phase induction motor. An ac adjustable capacitor using an electronic switch in parallel with a capacitor is proposed. The capacitor is short-circuited in a different period by an electronic switch during each cycle to vary the effective value of the ac capacitor. Two new optimization algorithms, which obtain a maximum starting torque by adjusting the effective capacitor, are proposed. No starting capacitor or centrifugal switch is used here. A theoretical analysis, and simulated and experimental results are presented in this paper.