JEE_V1_N1_RP3 Shaikh Moinuddin Atif Iqbal Journal on Electrical Engineering 2230 – 7176 1 1 30 41 multi phase ac motor, seven phase, space vector Multi-phase ac motor drives are nowadays considered for various applications, due to numerous advantages that they offer when compared to their three-phase counterparts. Adjustable speed drives are invariably supplied from a voltage source inverter. Proper modelling of voltage source inverters is important in devising appropriate control algorithm. This paper develops complete model of a seven-phase voltage source inverter based on space vector approach. The leg voltages and line voltages along with phase voltages are illustrated. The Fourier analysis of output phase-to-neutral voltages, adjacent line voltages and non-adjacent line voltages is performed for fourteen-step and Pulse Width Modulation (PWM) modes of operation. The output phase-to-neutral voltage is shown to be essentially identical to those obtainable with a three-phase voltage source inverter. July - September 2007 Copyright © 2007 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=478