積層鋼板モデリング手法を用いた斜角端部コアリアクトルの三次元渦電流解析

摘要

The eddy current is induced in silicon steel sheets of core block of power reactor due to the fringing flux, and this causes a local overheating. If a bevel edge core is used in the reactor composed of laminated core, the eddy current loss may be reduced. In order to investigate the behavior of flux and eddy current in the reactor, a modeling technique of laminated core for exact and quick practical nonlinear analysis is investigated. It is shown that the practical analysis under distorted flux waveform is possible by subdividing only the region near the surface of lamination, and the inner part is subdivided as a bulk core having anisotropic conductivity. The flux and eddy current distribution of the bevel edge core reactor is investigated using the modeling technique of laminated core. It is illustrated that the maximum eddy current loss is reduced to about 20%, and the total eddy current loss is decreased to about 50% by introducing the bevel edge core.%鉄心部にギャップを有する積層鉄心型リアクトルは，ギrnャップ部で外側へ広がるフリンジング磁束によって電磁鋼rn板に渦電流が発生する。この渦電流損は局部過熱や焼損事rn故の原因となっている。