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A direct-drive wind turbine dispenses with the gearbox by using

  • A.a hydraulic transmission between rotor and generator
  • B.an induction generator connected directly to the network
  • C.a many-poled generator turning at rotor speed
  • D.a two-pole generator turning at synchronous speed

Answer: C

At a few tens of revolutions a minute the machine needs a great many poles and is correspondingly large in diameter, but the gearbox that most often fails is gone. Permanent magnet excitation keeps the diameter within reason.

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