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.

There are three different types of VFDs: • VSI - Voltage Source Inverter, e.g. PWM. • CSI - Current Source Inverter. • Flux vector control.

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  Drive, Variable, Frequency, Inverter, Variable frequency drive

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