Induction Motor Starting in Practical Industrial Applications

Variable-frequency drives (VFDs) offer smooth and soft motor-starting characteristics. They are widely used in various industrial areas. In this paper, electrical parameters for induction motor starting using VFDs are derived mathematically using the equivalent circuit of induction motors. Factors that could significantly affect the motor-starting performance are investigated. An electrical submersible pump system with various lengths of downhole cables is used as a motor-starting case study.