3次元磁界解析によるサイリスタ始動時のタービン発電機回転子まわりの渦電流分布解析 3D Magnetic Field Analysi of Turbine Generator Rotor Eddy Currents for a Static Frequency Converter Starting
The presence of stator current harmonics from static frequency converter starter operation results in the induction of currents of various magnitudes and frequencies on the surface of the rotor. These eddy currents flow in series-parallel paths comprised of rotor iron, rotor wedges, damper bars and retaining rings and distribute according to the impedance of the paths. If the plural rotor wedges retain field coils in one slot, the eddy current paths are complicated further. This paper describes turbine generator rotor eddy currents and losses for a static frequency converter starting. To consider air parts between a rotor wedge and the adjoining wedge, the currents are calculated by three-dimensional numerical magnetic field analysis. The results are as follows.<br>(1) The eddy currents flow mainly in the wedge.<br>(2) If there are the damper bars, the eddy currents concentrate in the damper bars between two adjoining wedges.<br>(3) If there is no damper bar, the eddy currents concentrate in the rotor tooth between two adjoining wedges.
- 電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society
電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society 118(9), 1063-1070, 1998-09
The Institute of Electrical Engineers of Japan