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In a closed-loop dc drive the inner control loop regulates

  • A.the position of the shaft as measured by an encoder
  • B.the field current of the machine at its rated value
  • C.armature current
  • D.the speed of the machine as measured by a tachogenerator

Answer: C

Current responds far faster than speed, so a fast inner loop regulates it while a slower outer loop commands it. Since torque follows current, the inner loop is in effect a torque loop and also provides the current limit.

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