Comparative study on standardized tests to determine energy efficiency in three-phase induction motors operating at partial load

Abstract

Present paper shows a comparative analysis of the results obtained by the application of three different standard tests procedures to calculate the energy efficiency on induction motors and the separated losses. Test procedures considered are the IEC60034, IEEE112 and CSA390 standards. Each of these procedures define different ways to obtain the separated losses and to estimate the energy efficiency, thus they deliver different results in its calculation; sometimes considerable difference between the efficiency calculations are obtained and reported. The conducted tests were executed in laboratory controlled conditions in an induction motor driven at different percentage of load and following the indications of each standard procedure; results are shown and discussed.