However, the global market penetration for all applications of VFDs is relatively small. Systems using VFDs can be more efficient than those using throttling control of fluid flow, such as in systems with pumps and damper control for fans. About 45% of the world's electrical energy is consumed by electric motor driven systems. VFDs are used in applications ranging from small appliances to large compressors. A variable-frequency drive ( VFD) or adjustable-frequency drive ( AFD), variable-voltage/variable-frequency ( VVVF) drive, variable speed drive ( VSD), AC drive, micro drive or inverter drive is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.
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