報告書番号

T99057

タイトル（和文）

等価磁気モーメント推定による電気機器周辺磁界の定量的評価手法の提案

タイトル（英文）

New Method for Characterization of Magnetic Field near Electrical Appliances by Simple Estimation of Equivalent Magnetic Dipole Moment

概要 （図表や脚注は「報告書全文」に掲載しております）

各種環境における低周波磁界特性の定量化が求められており，本研究では，これまで困難であった電気機器周辺磁界の定量的評価手法について，電気機器を，これと等価な磁気モーメントに置き換えることにより周辺磁界を定量化する手法について，簡便かつ磁界波形の特徴を表現可能な手法を提案した．主たる成果は以下のとおり．１）電気機器に等価な磁気モーメントを推定し，機器周辺磁界の予測を行う新たな手法を考案した．本手法はわずかな点数の磁界測定により，モーメント位置の推定とモーメントの大きさの推定を行い，機器周辺磁界の予測が簡便に行うことができる手法である．２）磁界の基本周波数以外の成分を考慮可能なパラメータを導入し，磁界波形の特徴を表現可能とした．３）提案した評価手法を各種の電気機器に適用し，各機器の等価磁気モーメントを推定を行い，本手法の有効性を確認するとともに，本手法が適用可能な条件を明確化した．

概要 （英文）

A new simple method to characterize magnetic field distribution around electric appliances was proposed. The method consists of estimation of the magnetic dipole moment vector which is equivalent to an electric appliance. In the proposed method, the dipole moment vector was assumed to be a scalar value by allowing 6dB uncertainty in the estimated magnetic field, which allows us to easily estimate the position and amplitude of the magnetic dipole moment. The validity of the method was verified by experiments using three types of appliances. In addition, frequency characteristics of the magnetic field were taken into account by considering harmonics components in the magnetic field waveform. We used the proposed method for several types of electric appliances, and estimated their equivalent magnetic dipole moments and harmonics components. The results showed that the proposed method had several advantages compared with other methods, the main one being its simplicity. The conditions required for adoption of the method were also clarified. The method is adequate to quantify the magnetic field distribution around electric appliances.

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