Estimating Effect of System Harmonics on Losses and Temperature Rise of Squirrel-Cage Motors

With increasing application of static converter power supplies the magnitude of harmonic voltages to which other motors connected to the power system will be exposed must be considered. The additional losses and heating that will occur in these motors may require derating. A simplified expression defined as the harmonic voltage factor (HVF) for estimating the effect of harmonic voltages on polyphase squirrel-cage motors is developed.