Abstract
This paper presents a study on how manufacturers are working to comply with the minimum energy performance standards in three-phase squirrel-cage induction-motors. One of the possibilities is to reduce the stator and rotor resistances, and to increase the magnetizing branch resistance. A method to obtain the parameters of the equivalent circuit of the induction motor from the catalog data sheet is shown. A new method to separate the short-circuit reactance in stator and rotor components, based on start-up and breakdown torques, is presented. The variation in rotor parameters as a function of the slip is conveniently accounted for. The proposed methodology is applied to several motors from different manufacturers of significant influence in the European market. The main parameters that affect losses and energy efficiency of motors are compared, establishing an idea on how each of these manufacturers acts to meet energy efficiency requirements.
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