Safe starting, protection and speed control of induction motor

Abstract

Single phase power system is widely used as compared to three phase system for domestic purpose, commercial purpose and to some extent in industrial purpose. As the single phase system is more economical and the power requirement in most of the houses, shops, offices are small, which can be easily met by single phase system. The single phase motors are simple in construction, cheap in cost, reliable and easy to repair and maintain. Due to all these advantages the single phase motor finds its application in vacuum cleaner, fans, washing machine, centrifugal pump, blowers, washing machine, small toys etc. The single phase ac motors are further classified as: 1.Single phase induction motors or asynchronous motors. 2.Single phase synchronous motors. 3.Commutator motors. Induction motor Protection system from single phasing, over voltage, under voltage, overheating and phase reversal provides the smooth running of the induction motor expands its lifetime and also efficiency. Generally, these faults occur when supply system is violating its rating.