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Discussion

Referring quantities to the motor shaft is done so that

  • A.the whole drive can be treated as one rotating system
  • B.the load torque may be neglected in the analysis of the drive
  • C.the inertia of the load can be excluded from the calculation entirely
  • D.the gearing between the motor and the load need not be specified at all

Answer: A

Once inertia and torque are expressed at the motor shaft, the fundamental torque equation applies to the assembly as it stands. Gear ratios and efficiencies are folded into the referred values rather than being carried through the analysis.

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