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An inverter in a drive converts

  • A.direct current to alternating current of controlled frequency
  • B.alternating current to direct current for the dc link
  • C.direct current at one voltage to direct current at another
  • D.mechanical power at the shaft into electrical power

Answer: A

Switching the dc link voltage onto the machine terminals in a controlled pattern synthesises an alternating supply of whatever frequency and amplitude is wanted. It is the stage that gives an induction machine its variable speed.

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