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A resolver produces output voltages proportional to

  • A.the torque being transmitted through its shaft
  • B.the temperature of the machine it is fitted to
  • C.the sine and cosine of its shaft angle
  • D.the speed at which its shaft is turning

Answer: C

Two stator windings in quadrature give a pair of signals from which the angle follows unambiguously over a revolution. Having no optics and no electronics at the shaft, it tolerates heat, dirt and vibration far better than an encoder.

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