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A centrifuge accelerating to speed presents a drive with

  • A.no requirement for accelerating torque at all
  • B.a large inertia requiring sustained accelerating torque
  • C.a constant torque with negligible inertia to accelerate
  • D.a torque that falls with the square of the speed

Answer: B

Almost all the duty is in getting the mass up to speed, and the run-up may last minutes with the drive at its current limit throughout. Thermal rating for that sustained transient, not the steady running load, is what sizes the machine.

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