Variable-frequency drive

A variable-frequency drive (VFD) is a system for controllingTL085CN

 the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electricall7805

 power supplied to the motor.A variable frequency drive is a specific type of adjustable-speed drive. Variable-frequency drives are also knownOPA627AU

 as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, microdrives or inverter drives. Since the voltage is varied along with frequency,f7105

 these are sometimes also called VVVF (variable voltage variable frequency) drives.Variable-frequency drives are widely used in ventilation systems for large buildings; variable-frequency motors onB500C2300-1500

 fans save energy by allowing the volume of air moved to match the system demand. They are also used on pumps, elevator, conveyor and machine tool drives.