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Speed accuracy of a closed-loop drive is limited chiefly by

  • A.the efficiency of the machine at rated load
  • B.the class of insulation used in the windings
  • C.the quality of its speed feedback
  • D.the moment of inertia of the rotating parts

Answer: C

The controller can only hold the speed as well as it can measure it, so the resolution and the drift of the feedback device set the floor. A good encoder gives a hundredth of a per cent or better, where an analogue tachogenerator gives perhaps a tenth.

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