A Study of Current Waveform Analysis for PWM Inverter-Fed Permanent Magnet Synchronous Machine Based on Harmonic Reactance

Abstract

This paper proposes a method for calculating and analyzing the current waveforms of a permanent magnet synchronous machine (PMSM) that is controlled by a PWM inverter with harmonic distortion. This method is based on dq axis equations. Reactances are calculated by considering the saturation and cross-magnetization, and they are examined along with their frequency characteristics. These reactances are calculated by using the finite element method and the dq axis equations to satisfy the steady load condition. A comparison of the calculated and measured waveforms for a 5-kW PMSM shows that the two waveforms are in good agreement.