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The standard structure of a closed-loop drive is

  • A.a fast inner current loop inside a slower speed loop
  • B.a fast inner speed loop inside a slower current loop
  • C.a single loop controlling the converter firing directly
  • D.two independent loops with no connection between them

Answer: A

Current responds in milliseconds and speed in tens or hundreds, so the loops are nested with the faster inside. That arrangement also gives a natural current limit, since saturating the speed controller's output caps the torque demand.

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