Topology Optimization of Wireless Power Transfer Devices to Maximize Those Efficiency

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20431
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Nagasaki University
• Principal Investigator: OTOMO Yoshitsugu 長崎大学, 工学研究科, 助教 (60964442)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: ワイヤレス電力伝送 / トポロジー最適化 / パラメータ最適化 / 電力伝送効率 / パワエレ回路 / 交流損失解析

Outline of Final Research Achievements

In this study, we developed a topology optimization method for wireless power transfer devices considering magnetic and circuit properties. In the proposed optimization, TX and RX coil shapes are determined by the parameter optimization for manufacturability, whereas the magnetic core shape is determined by the topology optimization. After the circuit parameters considering the eddy current loss in TX and RX coils are computed by using the homogenization-based finite element method, the power transfer efficiencies of the optimized WPT device are evaluated by using a SPICE simulation. It is clarified that the optimized WPT coils result in high efficiency over 90% even when there is a misalignment. This is due to the fact that the magnetic coupling and quality factors are improved by the cap-shaped magnetic core facing each other in TX and RX coils.

Free Research Field

形状最適設計

Academic Significance and Societal Importance of the Research Achievements

自動車や航空機をはじめとする様々な輸送機械の電動化に伴い，充電の手間を大幅に軽減可能にするワイヤレス電力伝送の需要は日々増している状況にある。その中で，本研究において開発したワイヤレス電力伝送装置の最適設計法はシステム全体としての効率を大幅に改善できるため，社会的な利便性向上と省エネルギー化達成という二つの課題を解決することに寄与する。また，提案法は他のパワーエレクトロニクス関連機器にも適用可能であるため，高効率な電気機器の設計開発に広く貢献できる。