A Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. With a VFD, you don't need a 3Phase Meter to run your 3Phase Motor. You can run your 3Phase Motor with a 1Phase (Single Phase) Meter.
Other names for a VFD are Variable Speed Drive, Adjustable Speed Drive, Adjustable Frequency Drive, AC Drive, Microdrive and Inverter.