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

スポンサーリンク

概要

• 論文の詳細を見る

• 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.

著者

• Ohtomo Ryuhei

  Shinshu Uiversity

• Mizuno Tsutomu

  Shinshu Uiversity

• Ueda Takuto

  Shinshu Uiversity

• Yachi Shintaro

  Shinshu Uiversity

• Goto Yoshihito

  Shinshu Uiversity

関連論文

• Examination on Length of Coaxial Cable for Improvement in Temperature Drift of Eddy-Current Displacement Sensor(Asia-Pacific Symposium on Applied Electromagnetics and Mechanics(APSAEM10))
• Influence of Bracket on Operating Distance of Inductive Proximity Sensor(The 20th MAGDA Conference in Pacific Asia (MAGDA2011))
• Method for Identifying Type of Eddy-Current Displacement Sensor Probe Based on Output of Self-Excited Oscillator(The 20th MAGDA Conference in Pacific Asia (MAGDA2011))
• Dependence of Efficiency on Wire Type and Number of Strands of Litz Wire for Wireless Power Transfer of Magnetic Resonant Coupling

スポンサーリンク