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VVVF Drives

07/15/2010 12:02 AM

what is reversing type of VVVF drives? How are they advantageous?

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#1

Re: VVVF Drives

07/15/2010 1:24 AM

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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#2

Re: VVVF Drives

07/15/2010 8:14 AM

The V3F drives available with forward and reverse.
Pumps required only forward drive system. But lift and elevators required both forward and reverse. In this you can vary the rpm from -Max to +Max

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#3

Re: VVVF Drives

07/15/2010 3:37 PM

Assuming there may be a translation issue here, maybe you meant what is called "regenerative" as in "reverse power" drives?

ALL VVVF drives are capable of "reversing" the rotation of the motor they are connected to, it is inherent in the design and I have never heard of anyone using that term to describe them because that would be essentially redundant. But there is a different type of VVVF drive that can allow power to flow either into the motor, or back from the motor into the grid. This is called "regenerative" because it allows a spinning AC induction motor connected to an overhauling load to become an induction generator and send power back to the line. This is done either as a form of energy recovery or as a way to provide dynamic braking of the load without the need for resistors or mechanical devices.

To discuss further, you would need to further clarify the context of your question.

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