JEE_V4_N2_RP7 S. Sankar Journal on Electrical Engineering 2230 – 7176 4 2 43 46 Efficiency, Power Factor, Losses, Rotor Power This paper deals with the possibility of the efficiency improvement for the three-phase, low voltage, squirrel cage motor, using copper for the rotor cage. The analyze was made for single speed, three-phase squirrel cage induction motors with the rated power between 0.55 and 45 kW; 2,4,6 and 8 poles. Both the materials costs increase and the saved energy during the machine life were considered. October - December 2010 Copyright © 2010 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1276