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Field weakening in a closed-loop dc drive is normally commanded

  • A.only during regenerative braking of the drive
  • B.only once the armature voltage reaches its ceiling
  • C.from standstill upwards, in proportion to the speed reference
  • D.whenever the armature current exceeds its rated value

Answer: B

Below that point full flux gives the most torque per ampere, so there is nothing to gain by weakening the field. Once the converter can raise the voltage no further, reducing the flux is the only route to higher speed.

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