Variable Frequency Drive (VFD)

What is variable frequency drive?

A variable frequency 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.


Voltage source inverter drive, current source inverter drive, Load commutated inverter drive, Cycloconverter

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a. Variable frequency drives are widely used to control the speed of AC motors, like conveyor systems, blower speeds, pump speeds, pump speeds & other applications that require variable speed with variable torque.

b. In some applications such as speed control for conveyor, the variable frequency drive is installed with a remote potentiometer that personnel can adjust manually to set the speed for the conveyor.

c. Due to decreasing prices of frequency drives VFDs are being used on smaller and smaller systems, such as swimming pool systems. VFDs can also be added to pressure booster pumps as an alternative to using pressure control valves.

d. They have various uses like for compressor in oil and gas industry, for refrigeration compressor, for centrifugal pumps, for virtual vibration testing in railway system etc.


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