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The current limit of a closed-loop dc drive is implemented by

  • A.clamping the output of the speed controller
  • B.inserting resistance in the armature circuit during heavy transients
  • C.reducing the field current of the machine when the current is large
  • D.switching the converter off whenever the current exceeds its limit

Answer: A

Because the speed controller's output is the current reference, saturating it caps the current the inner loop will call for. The drive then accelerates at constant torque until the speed error falls back into the linear region.

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