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1 HP to 500 HP. The WEG CFW09 Series of Variable Frequency Drives incorporate the worldâs most advanced technology in drives for three-phase AC induction motors.
1 - VFD working principle VFD is shorted for Variable Frequency Drive (also known as AC Drives and Inverters) -- that's used to make an AC motor working in variable speed (among other parameters). 2  This is definition used in all topical discussion on this paper.ariable frequency drives are widely used to control the speed of ... Variable frequency drive in HVAC ... Variable frequency drives (VFD) have been used for HVAC systems in buildings for more than 40 years.