Towards Energy Efficiency at Induction Motors-Technical and Economic Aspects

Induction motors account for forty percents of the world’s electricity consumption and for almost seventy percents of total electricity consumption in industry. Therefore, several technical aspects of the construction of induction asynchronous motors—specifically motor length, diameter, and the number of conductors in the stator slots—are analysed, and the impact of each parameter on motor efficiency is examined individually Furthermore, the effect of replacing aluminium rotor bars with copper bars on motor efficiency is examined. The effect of efficiency increasing on electricity savings in correlation to motor operating hours is presented. In addition, a comparative analysis is conducted between the asynchronous motor model exhibiting the highest efficiency and a synchronous line-start motor constructed with identical design parameters. Adequate conclusions on usage of energy efficient motors instead of motors with lower efficiency and their impact on electricity savings are derived.