REVIEW ON EFFICIENCY IMPROVEMENT IN SQUIRREL CAGE INDUCTION MOTOR BY USING DCR TECHNOLOGY
Subramanian Manoharan - Nanjundappan Devarajan - Subbarayan M. Deivasahayam - Gopalakrishnan Ranganathan
Induction motors account for approximately 50 % of the overall electricity use in industrialized countries. In the agricultural and commercial sectors also, power consumption by ac motors is quite substantial. On an average, the energy consumed by a motor during its life cycle is 60-100 times the initial cost of the motor. Therefore efficiency of the motor is of paramount importance both during selection and operation. Even small increase in efficiency improvement can make a big difference in energy savings with accompanying decrease in air contamination. High electrical conductivity of copper in the rotor structure of a squirrel cage induction motor can achieve a reduction in overall energy losses of around 11 % - 19 % and a consequent increase in energy efficiency. This paper reviews the implementation of Die-Cast Copper Rotor (DCR) Motor, Efficiency improvement, Energy saving potential, adoption of DCR Technology in India and the comparisons of various efficiency standards besides the application of DCR motor in agricultural pump sets. The needs and tasks regarding the technology are also discussed.
Keywords: induction motor, premium efficiency, efficiency improvement, die cast copper rotor, DCR technology, and efficiency standards