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Armature current and magnetic force at rotor dampers in superconducting generator on sudden three‐phase short circuit
Author(s) -
Kometani Haruyuki,
Sakabe Shigekazu,
Hirao Toshiki,
Nakabayashi Yukio
Publication year - 1994
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391140809
Subject(s) - armature (electrical engineering) , electromagnetic coil , damper , mechanics , electromotive force , counter electromotive force , shunt generator , electrical engineering , engineering , physics , superconducting electric machine , control theory (sociology) , structural engineering , computer science , superconducting magnet , superconducting magnetic energy storage , control (management) , artificial intelligence
The important design factor of a superconducting generator is estimating the electromagnetic forces at the rotor dampers on a sudden three‐phase short‐circuit. In this paper, the armature current and electromagnetic forces on such a short‐circuit are simulated directly by two‐dimensional transient analysis, considering the following complex terms: 1 induced current by the speed electromotive force caused by the rotor rotation; the connection of three‐phase windings; and 3 the resistance and reactance at the armature coil‐end. The speed electromotive force is considered by using the combination method, which is FEM combined with BEM at the air gap. The connection of the armature winding and the effect of the armature coil‐end are considered by using the analysis combined with the external circuit equations. Moreover, the effect of the Röbel transposition of the armature winding is approximately considered. As a result of analysis, the electromagnetic forces at the rotor dampers can be calculated with a high accuracy.