Abstract

This paper presents a novel algorithm for in-situ full-load efficiency estimation of induction motors operating under unbalanced voltages. The goal of this research work is to design a reliable in-situ efficiency estimation tool that can be used in industry to derate induction motors operating with unbalanced voltages. The proposed technique utilizes the genetic algorithm, IEEE Form F2-Method F1 calculations and pretested motor data. The method requires a DC test, full-load rms voltages, currents, input power and speed measurement. The proposed algorithm uses a sensorless speed measurement technique. The algorithm is evaluated by testing two induction motors with different voltage unbalance conditions. The results show acceptable accuracy.

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