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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.
Inverter VFD'S For Dummies. Variable Frequency Drives (VFD's) are used to vary the speed of an electric motor. They do this by changing the frequency of the electric power going to the motor. They work only with three-phase power. Today they are very economical: we recently paid $500 for a 5-hp unit.