Analysis of Induction Motor Drives with a Nonsinusoidal Supply Voltage Using Fourier Analysis

A method of analysis of induction motor performance with nonsinusoidal supply is presented. It is based on the Fourier analysis of the impressed voltage waveform. Equivalent circuits for the various harmonics are derived, and the resultant harmonic currents are calculated. Experimental verification of the method is obtained by calculating the current waveform from the Fourier components and comparing it with oscillograms. Experimental data obtained from a cycloconverter and different types of inverters are used and show good agreement with calculated results. Evaluation of different schemes of power control and effects of a rapid variation of slip frequency are examined.