Two Speed Single Phase Induction Motor with Electronically Controlled Capacitance

Abstract

An experimental exploration of using an Electro�nically Controlled Capacitor (ECC) in the supply system of a two speed single phase induction motor drive is presented. The ECC solution and the method with solution with a fixed value capacitor are comparatively analyzed in terms of efficiency and maximum torque availability. The losses and the over-voltages due to the electronic commutation are also analyzed. The paper proves the feasibility of the ECC solution and underlines its advantages and drawbacks. The optimal value of the switching frequency of ECC has been experimentally determined.

Keywords

• electronic controlled capacitor
• energy efficiency
• single phase induction motors
• circular rotating field
• PWM control