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A salient pole synchronous machine can develop some torque even without excitation because of

  • A.the permanent magnetism retained in its pole faces
  • B.the torque produced by its damper winding at synchronous speed
  • C.its reluctance torque
  • D.the currents induced in its field winding by the stator field

Answer: C

The difference between the direct and quadrature reactances gives a torque that tries to align the low-reluctance axis with the field. It is the basis of the synchronous reluctance machine, which dispenses with excitation entirely.

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