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A drive that must position as well as control speed requires

  • A.a machine with a very large moment of inertia
  • B.a position loop and a position feedback device
  • C.an open-loop V/f converter with slip compensation
  • D.a fluid coupling with scoop control

Answer: B

Correct answer: a position loop and a position feedback device

Position control needs an outer loop closed on position, cascaded over the speed and current loops, and it needs a device that actually reports position - an encoder or resolver. A speed loop alone accumulates error indefinitely, since a small speed error integrates into an ever-growing position error.

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