Dependence of Efficiency on Wire Type and Number of Strands of Litz Wire for Wireless Power Transfer of Magnetic Resonant Coupling

カテゴリ: 論文誌(論文単位)

グループ名: 【D】産業応用部門（英文）

発行日: 2014/01/01

タイトル(英語): Dependence of Efficiency on Wire Type and Number of Strands of Litz Wire for Wireless Power Transfer of Magnetic Resonant Coupling

著者名: Tsutomu Mizuno (Shinshu Uiversity), Takuto Ueda (Shinshu Uiversity), Shintaro Yachi (Shinshu Uiversity), Ryuhei Ohtomo (Shinshu Uiversity), Yoshihito Goto (Shinshu Uiversity)

著者名(英語): Tsutomu Mizuno (Shinshu Uiversity), Takuto Ueda (Shinshu Uiversity), Shintaro Yachi (Shinshu Uiversity), Ryuhei Ohtomo (Shinshu Uiversity), Yoshihito Goto (Shinshu Uiversity)

キーワード: wireless power transfer of magnetic resonant coupling，magnetoplated wire，number of strands，quality factor，transmission efficiency，temperature increase

要約(英語): Wireless power transfer is expected to be applied to portable devices and electric automobiles in the future. To achieve this, it is necessary to improve the transmission efficiency of the coils used in wireless power transfer, that is, to improve the quality factor and coupling coefficient of the coils. To improve the quality factor of the coils, the authors propose the use of a litz wire with a magnetoplated wire (MPW), which is a copper wire plated with a thin iron film. The MPW increases the quality factor of the coils by reducing the AC resistance owing to the proximity effect. In this study, the effect of the number of strands of a litz wire on the quality factor of the coils and efficiency characteristics is considered. Moreover, the quality factor of the coils and efficiency characteristics using three types of coil―a solid copper wire (COW), a litz wire with a copper wire (LCW), and a litz wire with an MPW (LMW)―are considered. At the transmission frequency f =13.56MHz, it is experimentally demonstrated that many strands, whose number becomes the highest in terms of the quality factor of the coils, exist. The transmission efficiencies of the COW, LCW and LMW coils at an output power of 5W and a transmission distance of 9mm are 89%, 84%, and 91%, respectively, and the efficiency of the LMW coil is the highest. Also, in this case, the temperature increases of the COW, LCW, and LMW coils are 12°, 16°, and 10°, respectively, and the LMW coil reduces the temperature increase.

本誌: IEEJ Journal of Industry Applications Vol.3 No.1 （2014）Special Issue on Motion Control and its Related Technologies

本誌掲載ページ: 35-40 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/3/1/3_35/_article/-char/ja/