VARIABLE FREQUENCY DRIVE - gsengr.com

VFDRECOMMEN-DATIONSVARIABLE FREQUENCY DRIVEThe synchronous speed of an induction motor isprimarily a function of the number of poles andthe FREQUENCY :A slip between actual and synchronous speed isgenerated by the applied load torque. This slip isusually small, typically 1-3% of synchronous way to achieve a VARIABLE speed motor is to varythe FREQUENCY . Such a device is called a frequencyconverter. FREQUENCY converters, also called vari-able speed drives, are usually installed to allow fora better process control and to save energy. Theusage of VARIABLE FREQUENCY DRIVE (VFD) control inpump applications is becoming increasingly com-mon. The cost of a VFD has decreased over theyears while the performance has improved. Amodern VFD is a compact, well-developed unitwhich is relatively easy to install. Unlike an old VFD, the modern version doesnot require as much power margin (de-rating)and so does not affect the induction motor to thesame extent, this is due to the fact that VFDswitching FREQUENCY is higher today.

The synchronous speed of an induction motor is primarily a function of the number of poles and the frequency: A slip between actual and synchronous speed is

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  Drive, Variable, Frequency, Variable frequency drive

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