An innovative approach for energy conservation in induction motor

Abstract

Three phase Induction motors are mainly employed in Textile mills, Agriculture and almost in all the machine tools. About 65% to 70 % of electrical energy generated is being utilized by three phase induction motors because of their robust construction and easy operation. Hence, a small improvement in the design of induction motor for energy conservation and increased efficiency is cost effective. Conventional induction motor consists of a three phase distributed winding in the stator and short circuited squirrel cage rotor. Generally, to have standard dimensions, induction motors are designed for standard output ratings. To have factor of safety, the ratings of the motor are generally chosen on higher side. Due to said reasons over rated motors are normally used. To improve the efficiency of the motor operation and to have sufficient energy conservation, a novel design and operation of Double Winding Induction Motor (DWIM) is suggested in this paper. This motor consists of two windings on the same stator core and conventional squirrel cage rotor. Out of two stator windings, one winding is used to meet the mechanical load. A three phase EMF is developed in other winding, works as an induction alternator. Both mechanical and electrical loading can be controlled by a PIC Microcontroller for its maximum efficiency and power balancing modes of operation.