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Energies 2018, 11(8), 2159; https://doi.org/10.3390/en11082159

Power Transfer Efficiency Analysis for Omnidirectional Wireless Power Transfer System Using Three-Phase-Shifted Drive

1
College of Automation, Chongqing University, Chongqing 400044, China
2
Shanghai Aerospace Equipment Manufacturer Co., Ltd., Shanghai 200245, China
*
Author to whom correspondence should be addressed.
Received: 25 July 2018 / Revised: 9 August 2018 / Accepted: 11 August 2018 / Published: 18 August 2018
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Abstract

In order to implement the omnidirectional wireless power transfer (WPT), a novel three-phase-shifted drive omnidirectional WPT system is proposed. This system is comprised of three independent phase-adjusted excitation sources, three orthogonal transmitting coils, and one planar receiving coil. Based on the mutual coupling theory, the power transfer efficiency is derived and the corresponding control mechanism for maximizing this efficiency is presented. This control mechanism only depends on the currents’ root-mean-square (RMS) values of the three transmitting coils and simple calculations after each location and/or posture change of the receiving coil, which provides the real-time possibility to design an omnidirectional WPT system comparing with the other omnidirectional systems. In aid of computer emulation technique, the efficiency characteristic versus the omnidirectional location and posture of the receiving coil is analyzed, and the analytical results verify the validity of the control mechanism. Lastly, a hardware prototype has been set up, and its omnidirectional power transmission capacity has been successfully verified. The experimental results show that the wireless power is omnidirectional and it can be effectively transmitted to a load even though its receiving coil moves and/or rotates in a 3-D energy region. View Full-Text
Keywords: wireless power transfer (WPT); power transfer efficiency; omnidirectional wireless power; three-phase-shifted drive; mutual inductance coupling wireless power transfer (WPT); power transfer efficiency; omnidirectional wireless power; three-phase-shifted drive; mutual inductance coupling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ye, Z.; Sun, Y.; Liu, X.; Wang, P.; Tang, C.; Tian, H. Power Transfer Efficiency Analysis for Omnidirectional Wireless Power Transfer System Using Three-Phase-Shifted Drive. Energies 2018, 11, 2159.

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