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A drive on a conveyor requiring rated torque at very low speed should have

  • A.a self-ventilated machine of exactly the rated output required
  • B.stator voltage control rather than frequency control
  • C.rotor resistance control to give the necessary torque
  • D.forced ventilation or a derated machine

Answer: D

Rated current at low frequency gives rated copper loss with almost no air flow, so the machine overheats unless it is cooled independently or a larger frame is used. It is one of the most common errors in variable-speed retrofits.

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