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A machine room-less lift uses

  • A.a hydraulic ram with no electrical drive at all
  • B.a dc machine with a Ward-Leonard set
  • C.a compact gearless permanent magnet machine in the shaft
  • D.a large geared induction machine in a room above

Answer: C

Correct answer: a compact gearless permanent magnet machine in the shaft

The permanent magnet machine gives enough torque at low speed to drive the sheave directly, so the gearbox disappears and the whole machine becomes small enough to fit within the shaft. That removes the motor room above the building, which is the point of the arrangement.

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