| 摘要 |
PROBLEM TO BE SOLVED: To remove such defects that when the initial transient reactance Xq" is large a rotor is rotated under the action of a torque due to an increase in the harmonic current in a short-circuit accident or an increase in the short- circuit torque. SOLUTION: An eddy current by a magnetic flux of the q axis component is let to flow in a circulation circuit 7, a damper bars 5A, 5B forming the circulation circuit 7 are placed in the range between 0 and 0.4 from the center 0 of a center axis d, when the distance (a) between the center axis d of pole piece parts 3A, 3B and the circumferential end part 3X of the pole piece parts 3A, 3B facing a gap 4 is assumed to be 1, the initial transient reactance Xq" is made to be small and the rotation of the rotor is made to be smooth.
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