Resumo

SOUSA SANTOS, Vladimir; VIEGO FELIPE, Percy; GOMEZ SARDUY, Julio  e  DE ARMAS TEYRA, Marcos. Efficiency analysis of induction motors in the presence of harmonics and unbalance voltage. Energética [online]. 2013, vol.34, n.2, pp. 163-173. ISSN 1815-5901.

In electric supply systems it is very common to find problems of power quality. The time harmonic flow in industrial electrical grids with voltage deviations and unbalance, significantly affects three phase induction motor operation and makes difficult energy characterization. There are different methods for in situ estimation of motors efficiency. However, none of them have been sufficiently precise for the analysis under non-sinusoidal, deviated and unbalanced voltage conditions. This paper presents a method based on the equivalent circuits, with losses segregation and using Bacterial Foraging Algorithm (BFA). It allows determining under field conditions and low invasiveness, energy efficiency of induction motors operating under the before mentioned conditions. This method was tested successfully on a 1,5 kW motor, fed with significant levels of unbalance and voltage harmonics.

Palavras-chave : bacterial foraging algorithm; harmonic with unbalance voltage; efficiency; induction motor.

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