Development of the Transformer for Contactless Power Suppliers

Contactless power supplier is composed of a transformer having the distinct primary and secondary coils separated by air gap. Because of the electromagnetic compatibility problem, it is essential to keep the leakage magnetic fields around the contactless power supplier as low as possible.This paper carries out the wavelets multi-resolution analysis to the magnetic field distributions around contact- less power supplier.　As a result, we have succeeded in obtaining one of the reasonable core shapes by observing the wavelets spectra of measured magnetic field vector distributions. Furthermore, it is revealed that a tested trial transformer gives nearly 80 percent power transmission efficiency even though the primary and secondary coils are separated by 10mm air gap

微分方程式による磁界分布の可視化

A novel methodology is proposed to visualize the electromagnetic vector fields. First, in order to apply the field theory of computer graphics proposed in this paper, an electromagnetic field vector is represented as a color image. According to our theory, the high-resolution image can be generated in accordance with like a natural phenomenon. Consequently, it is possible to obtain more precise electromagnetic field from the poor measured data. Secondary, we have applied our method to the practically experimented magnetic fields. As a result, validity of our method has been verified.本論文では、画像処理の一方法とそれを応用した電磁界ベクトルフィールドの可視化方法を提案する。第１に、本論文で提案する画像処理方法を電磁界分布解析へ応用するために、３次元ベクトルフィールドをカラー画像で表現する。そこで得られる画像を偏微分方程式で記述し、その方程式を解くことであらゆる画素数の画像を生成する。結果として、測定点数の少ないデータからより詳細な電磁界分布データが得られる。第２に、検証実験として、高周波駆動を前提とするフィルム状変圧器を用いたDC/DCコンバータ周辺に分布する磁界を測定し、本手法を適応する