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The overall efficiency of a drive is the product of the efficiencies of

  • A.the converter, the motor and the transmission
  • B.the motor alone, the other components being lossless in practice
  • C.the supply and the load, the drive itself introducing no losses
  • D.the control unit and the sensing unit taken together

Answer: A

Every stage between the supply and the driven machine takes its share, and modest losses at three stages multiply into a noticeable total. It is why a high-efficiency motor behind a poor gearbox is not an efficient drive.

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