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The sensing unit in a closed-loop drive provides

  • A.the mechanical connection between the motor and the load it drives
  • B.the conversion of alternating supply voltage into direct voltage for the motor
  • C.feedback of speed, position or current
  • D.the power that the motor requires to accelerate the load from rest

Answer: C

Tachogenerators, encoders and current transducers feed the measured quantity back so that the control unit can act on the error. Without them the drive can only be run open loop, with speed varying as the load changes.

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