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What is variable frequency drive?

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Question added by Adam Shaik , Electrical Trainee , JSW Cements Limited
Date Posted: 2016/01/29
IMRAN  LASKAR
by IMRAN LASKAR , Assistant Engineer , Amrit Cements Ltd

A Variable Frequency Drive is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Frequency is directly related to motors RPM. 

GOPALAKRISHNAN RAMACHANDRAN
by GOPALAKRISHNAN RAMACHANDRAN , MAINTENANCE MANAGER , UNITED plastic products company ltd (NAPCO GROUP)

Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed driveadjustable speed driveadjustable frequency driveAC drivemicrodrive, and inverter.

Frequency (or hertz) is directly related to the motor’s speed (RPMs). In other words, the faster the frequency, the faster the RPMs go. If an application does not require an electric motor to run at full speed, the VFD can be used to ramp down the frequency and voltage to meet the requirements of the electric motor’s load. As the application’s motor speed requirements change, the VFD can simply turn up or down the motor speed to meet the speed requirement.

Faisal Alarmouti
by Faisal Alarmouti , Senior Sales Engineer , Hitachi

VFD : it's motor controller , the other name variable speed drive ,

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