Affiliations: [a] School of Electrical Engineering, Wuhan University, Wuhan, Hubei, China | [b] Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, USA
Correspondence:
[*]
Corresponding author: Junhua Wang, School of Electrical Engineering, Wuhan University, No. 8 Donghu South Road, Wuhan 430072, Hubei, China. Tel./Fax: +86 13871562599; E-mail:junhuawang@whu.edu.cn
Abstract: A wireless energy transfer system based on magnetic
resonant technology for power transmission and rats playground recharging is
studied. The relationship among the self-inductance, mutual-inductance, the
maximum approachable efficiency and several key parameters of the system are
analyzed. The coupling coefficient, which depends on the above factors, is
illustrated through related equations and curves. According to the
specifications of energy storage and available space, a wireless energy
transfer system with a seven-circular-coil transmitter and one ``box''
receiver has been studied. The array transmitter has been fabricated to make
the produced magnetic field over the playground even and then transfer
enough energy. The fabricated novel small ``box'' receiver, consisting of a
tape coil on one layer, which is separated by an insulation layer, is
designed and compared with the normal receiver coil. The magnetic field
intensity above the transmitter and the system efficiency are simulated by
FEM analysis. The standing wave ratio and the system efficiency with
different distances and displacements are measured. The efficiency of
wireless charging system we designed is up to 45% at the resonant
frequency 5.56 MHz with the distance of 30 mm. And even the misalignment
occurred, the efficiency of the proposed system keeps comparatively stable.
Keywords: Power transmission, resonant, rats playground, Witricity technology
