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Above base frequency a V/f drive operates at

  • A.constant voltage with weakening flux
  • B.constant flux with the voltage rising in proportion to the frequency
  • C.constant slip with both the voltage and the flux held fixed
  • D.reduced voltage with the flux held at its rated value

Answer: A

The converter cannot exceed the supply voltage, so beyond that point the flux falls as the frequency rises and the available torque falls with it. The region is one of constant power, exactly as field weakening is in a dc drive.

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