A novel in situ efficiency estimation algorithm for three-phase induction motors operating with distorted unbalanced voltages

This paper presents a novel algorithm for in situ efficiency estimation for induction motors operating with distorted unbalanced voltages. The proposed technique utilizes the genetic algorithm, IEEE Form F2-Method F1 calculations, large motor test database and a new stray-load loss formula. The technique is evaluated by testing 3 small- and medium-sized induction motors with 11 different combinations of voltage unbalance and total harmonic distortion. The results showed acceptable accuracy. The technique may be used as a potential industrial tool that can help derate induction motors in the presence of voltage unbalance and harmonics distortion.

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