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In a salient pole machine, the direct axis reactance is

  • A.zero
  • B.larger than the quadrature axis reactance
  • C.smaller than the quadrature axis reactance
  • D.exactly equal to the quadrature axis reactance

Answer: B

Correct answer: larger than the quadrature axis reactance

The direct axis lies along the pole, where the magnetic path is mostly iron and the reluctance low, while the quadrature axis passes through the wide interpolar gap. Lower reluctance means higher permeance and higher reactance, so \( X_d > X_q \), typically by a factor of about two. The difference is what gives a salient pole machine its reluctance torque.

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