Efficiency-Slip Curve Determination of Induction Motors Using Technical Data

Induction motors are the most frequently employed as industrial drives since they are reliable and economical. Before putting the motors into service, their operating efficiencies must be carefully chosen to match with a desired mechanical loading range. So, the motor’s efficiency-slip curves are often required for proper selections of induction motor drives. This paper proposes a new method for estimating the efficiency-versus-speed profile of industrial induction motors. This method requires motor manufacturer data. Validation is conducted using a conventional standard equivalent-circuit model of single-cage induction motors. The presented approach helps users to select a proper operating condition of induction motors more efficiently.