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A machine tool spindle drive requires

  • A.constant torque from standstill to the highest speed it can reach
  • B.torque proportional to the square of the spindle speed at all times
  • C.no speed control at all
  • D.constant power over a wide speed range

Answer: D

Large diameters are cut slowly at high torque and small ones quickly at low torque, which is the constant-power envelope exactly. Gearing extends the range at the bottom where the converter alone cannot supply the torque.

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