An electronic AC Drives / Variable Frequency Drives (VFD) works on low to medium voltage, is a system for controlling the rotational speed of an Alternating Current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor. A variable frequency drives is a specific type of adjustable-speed drive. variable frequency drives are also known as Adjustable-Frequency Drives (AFD), Variable-Speed Drives (VSD), AC drives, microdrives or inverter drives. Since the voltage is varied along with frequency, these electronic ac drives are sometimes also called VVVF (Variable Voltage Variable Frequency) drives.
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