An Energy-Saving Scheme of Variable Voltage Control for Three-Phase Induction Motor Drive Systems

This paper presents a control scheme to implement the energy-savings of three-phase induction motors when they operate under long-term light-load or small duty ratio load. The proposed scheme is based on the principle of variable voltage control (VVC) at constant speed. The energy-saving controller for three-phase induction motors is developed. A group of the experiments demonstrate that the proposed scheme gives rise to the considerable energy-savings.