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A salient pole machine can develop torque even with no field excitation because of

  • A.the currents induced in its damper winding at synchronous speed
  • B.the residual magnetism retained in its pole faces
  • C.the eddy currents circulating in its rotor forging
  • D.its reluctance torque

Answer: D

The difference between the two axis reactances gives a torque that tries to align the low-reluctance axis with the field. It is the basis of the synchronous reluctance machine and it shifts the pull-out angle below ninety degrees.

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