Art Godfrey (retired)
Birclar Electric & Electronics
Romulus, Michigan
Introduction
Modern variable frequency drives (VFDs) offer an almost dizzying range of capabilities that include output frequencies into the hundreds of hertz. It can be tempting to use a standard AC induction motor with one of these VFDs. But doing so requires a thorough understanding of the intended application and how the VFD will affect the motor. Since the most popular VFDs sold today are pulse-width modulated (PWM) type, the comments and recommendations in this article will assume that is the type used. Also, motor voltage will be 600 volts or less.
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