A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. VFDs are used in applications ranging from small app...
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http://en.wikipedia.org/wiki/Variable-frequency_drive
An electronic device that varies its output frequency to vary the rotating speed of a motor given a fixed input frequency. They are used with fans or pumps to vary the flow in the system as a function of a maintained pressure.
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https://www.fieldwire.com/resources/construction-glossary/
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