Effect of Coils Geometry on Dynamic Wireless Power Transfer for Electric Vehicles
Sahar Bareli1, Lidor Geri1, Yasha Nikulshin1, Oren Nahum2,3, Yuval Hadas2, Yosef Yeshurun1, Eyal Yaniv4 and Shuki Wolfus1*
1Department of Physics, Bar-Ilan University, Israel
2Department of Management, Bar-Ilan University, Israel
3Economics and Logistics Studies, Faculty of Economics, Ashkelon Academic College, Israel
4Graduate School of Business Administration, Bar-Ilan University, Israel
*Corresponding Author: Wolfus, Department of Physics, Bar-Ilan University, Israel.
February 15, 2023; Published: March 13, 2023
Dynamic Wireless Power Transfer (DWPT) uses transmitting coils embedded in the road for charging the on-board battery of an Electric Vehicle (EV) while driving. The present work describes a method of finding optimal geometric parameters for receiver coils that corresponds to improved energy transfer. Stationary and dynamic scenarios were simulated to investigate the effect of said coils’ dimension on the electromagnetic coupling coefficient, k, and the energy transfer efficiency, η. In the stationary scenario, k exhibits a nonmonotonic dependence on the receiver coil dimension, with its peak corresponding to the optimal coil dimension. The dynamic scenario shows oscillations of k and η along the travel path. Both scenarios are analyzed and explained by the spatial distribution of the magnetic field generated by the transmitter coils. A method for selecting the optimal configuration for the dynamic case is suggested. The method relies on the magnetic flux behavior of the transmitter coils, and can be applied to other receiver configurations as well. Finally, we show that the addition of a ferrite plate between the receiver array and the EV chassis is shown to screen the non-ionizing radiation emitted by the transmitter coils and reduce it to well below the allowed standards.
Keywords: Dynamic Wireless Power Transfer; Smart Transportation; Electric Vehicles
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