An Improved Method of Voltage Utility Factor for PWM Control of a Five-Leg Inverter in Two Induction Motor Drives

This paper presents an improved method of voltage utility factor (VUF) from 50 to 86.6% for a five-leg inverter when two induction motors are driven in vector control and in a condition where the frequencies of the two motors are not very different, and the improved method of voltage utility is theoretically shown. Many modulation methods for the five-leg inverter have been proposed, but the voltage utility factor is 50% in these methods. The voltage utility factor of the five-leg inverter is lower than that of the three-leg inverter as maximum voltage utility factor of the three-leg inverter is 100%. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.