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The most common reason for fitting a gearbox between a motor and its load is that

  • A.the load requires much less torque than the motor is able to develop
  • B.the gearbox improves the efficiency of the drive as a whole
  • C.the gearbox reduces the inertia of the motor as seen by the load
  • D.the load runs much more slowly than an economical motor

Answer: D

Electrical machines are cheapest and most efficient at a few thousand revolutions a minute, while many loads want tens. Reduction trades that speed for torque and incidentally hides the load inertia behind the square of the ratio.

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