学位論文

スープ皿形状フェライトコアを用いた一次・二次コア分離型変圧器の最適設計に関する研究

Research on Optimum Designof theContactless Transformers using Soup Plate Like Ferrite Cores

jpn

2013-03-24

Not Applicable (or Unknown)

2013-03-24

修士(工学)

工学研究科電気工学専攻; 指導教授: 斎藤兆古

All of the modern electrical devices are composed of two major parts: one is the electrical/electronic signal processing parts, and the other is the power suppliers. Contactless power supplier is composed of a transformer having the distinct primary and secondary coresseparated by air gap. Because of the electromagnetic compatibility problem, it is essential to keep the leakage magnetic fields around the contactless power supplier as possible as low. This paper has clarified that the wavelets multi-resolution analysis to the magnetic field distributions around contactless transformer leads to obtain one of the reasonable core shapes by observing the wavelets spectra of measured magnetic field vector distributions. Furthermore, it has been revealed that a tested trial transformer gives nearly 80 percent power transmission efficiency even though the primary and secondary coils cores are separated by 10mm air gap. Further, this paper is one of the success research solutions to overcome the specific absorption rate(SAR) problem based on the finite elements and optimization methodologies. Thus, a contactless flat shaped transformer whose primal and secondary ferrite cores are separated by air gap has been successfully developed by means of the discrete wavelets transforms, the finite element methods and the linear programming optimization approaches.

Thesis