22-06-2010, 12:06 AM
medium voltage VFD
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"medium voltage VFD"
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22-09-2010, 10:26 AM
More Info About "medium voltage VFD"
Variable-frequency drive
From Wikipedia, the free encyclopedia
Small variable frequency drive
A variable-frequency drive (VFD) 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.[1][2][3] A variable frequency drive 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 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 on 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.
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http://en.wikipediawiki/Variable-frequency_drive
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