An Efficient Variable Speed Drive Scheme For Squirrel Cage Induction Motors Using Stator Neutral Switching

Abstract

The paper presents a simple low cost variable speed drive using stator neutral switching of squirrel cage induction motors. The scheme is suitable for typical f i n , pump and compressor load applications. The scheme can be utilized as soft starter as well as speed control. The scheme can also be supplemented with on-line efficiency enhancement regulating loops to ensure electrical energy conservation.