Input Impedance and Losses of Induction Motors Operating from Inverters

Abstract

Abstract A method for calculating the harmonic input impedance Z_H and harmonic losses W_H of induction motors operating from PAM- and PWM inverters is presented. The method is derived by use of six test motors, of ratings from 1.5 KW to 900 KW. A simple method is given for calculating the skin effect coefficients K_R and K_X. The method indicates that it is necessary to consider the skin effects and the stray load losses. Effects of harmonic order, and carrier frequency on Z_H and W_H are discussed,