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Matching a drive to a load means ensuring that

  • A.the drive and the load have equal moments of inertia
  • B.the available torque exceeds the required torque at every speed
  • C.the drive's speed range exactly equals the load's speed range
  • D.the drive's efficiency is highest at the load's lowest speed

Answer: B

Plotting the two torque-speed curves on the same axes shows at once whether the drive can serve the load throughout, and where the margin is thinnest. A constant-power load below base speed and a constant-torque load above it are the two mismatches that most often catch people out.

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