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Regenerative braking of an inverter-fed induction motor requires the drive to

  • A.raise the supply frequency above the speed of the rotor
  • B.open the rotor circuit of the machine during braking
  • C.dispose of the returned energy from the dc link
  • D.inject direct current into the stator windings of the machine

Answer: C

Lowering the commanded frequency below the rotor speed makes the machine generate into the link, and the link voltage then rises unless something takes the energy. A braking chopper and resistor or an active front end are the two solutions.

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