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Answer Posted / soumya chatterjee
Syn. Speed = (120xf)/P. The basic principal of VFD is to
change the syn. speed of the drive by varying the
frequency. The input sinusoidal voltage gets converted to
DC and againg to AC with lower frequency. The basic
principal also ask for constant flux which is governed by
the ratio V/f. At lower frequency the voltage also reduces
to keep the value of the ratio constant.Which in turn
reduces the input current to the VFD as the voltage at the
incoming terminal of the VFD does not change by VFD
operation.Thereby causes saving in power consumption.
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