A variable frequency drive (VFD), also known as an adjustable-frequency drive (AFD), variable-speed drive (VSD), AC drive, or inverter drive, is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. VFDs are used in applications ranging from small appliances to large compressors. They are commonly used to control the speed of AC induction motors, allowing for energy savings and process control.
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