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The moment of inertia of a drive affects

  • A.how quickly it can change speed
  • B.the steady running speed that the drive eventually settles at under a given load
  • C.the efficiency of the motor at its rated operating point
  • D.the load torque that the driven machine imposes at any particular speed

Answer: A

Inertia appears only in the term multiplying the rate of change of speed, so it governs transients and nothing in the steady state. A high-inertia drive is slow to start and slow to stop but is unaffected in its steady behaviour.

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