Transcription of VARIABLE FREQUENCY DRIVE - gsengr.com
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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 actual duty point is always the intersection between the pump curve and the system curve. The hydraulic (pump) efficiency in systems with a
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