Electromagnetic coupling optimization by coil design improvements for contactless power transfer of electric vehicles

Duan, Junlong and Wang, Weiji (2018) Electromagnetic coupling optimization by coil design improvements for contactless power transfer of electric vehicles. FTC 2018, Vancouver, Canada, 13-14 November 2018. Published in: Arai, Kohei, Bhatia, Rahul and Kapoor, Supriya, (eds.) Proceedings of the Future Technologies Conference (FTC) 2018. 2 944-958. Springer, Cham, Switzerland, Cham. ISSN 2194-5357 ISBN 9783030026820

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Abstract

The fossil fuel scarcity worldwide has rapidly driven the electric vehicles and battery charging technologies, including contactless power transfer (CPT), over the past decades. There still exist many technical difficulties to be specifically addressed and ideas to be innovatively achieved although a lot of contribution on EVs charging solutions has been made by the engineering world. In this paper, the comparatively up to date CPT technologies for EVs charging were investigated and the project methodology was discussed from the aspects of maximizing the charging system efficiency, power transfer rating levels and air gaps of charging coupling coils. Until present, the different coil designs, ferrite core deployments, operating frequencies and air gaps are acting as the main investigation factors regarding producing transfer efficiencies and power ratings on the load end. By modeling and simulating the electromagnetic field couplings with the simplified inductive transmitting system in 3D finite-element methods based environment, an Axis-to-Axis (Coaxial) rectangular coil CPT system and an Axis-Parallel (Non-coaxial) rectangular coil system have been modeled and quantitatively compared. Besides, an axis-parallel coil system and a C-Type rectangular coil system deploying ferrite cores with 50 mm air gap have been analyzed, resulting in output efficiencies over 85% and 74%, respectively. In addition, the effectiveness of using a ferrite core to improve the flux linkage and magnetic flux density can be noticed. From the perspective of electromagnetic field, the contributions of deploying natural resonant frequencies of transmitting ground side and receiving vehicle side in terms of system efficiency, magnetic field strength generated and actual power transfer ratings have been described.

Item Type: Conference Proceedings
Keywords: Contactless power transfer (CPT), Wireless power transmitting (WPT), Inductive coupling, Finite element method (FEM), Maxwell equations, Ferrite cores, Electric vehicles (EV) charging efficiency
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Dynamics, Control and Vehicle Research Group
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA0165 Engineering instruments, meters, etc. Industrial instrumentation
T Technology > TA Engineering (General). Civil engineering (General) > TA0174 Engineering design
T Technology > TA Engineering (General). Civil engineering (General) > TA1001 Transportation engineering
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK4001 Applications of electric power
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Depositing User: Junlong Duan
Date Deposited: 29 Oct 2018 11:34
Last Modified: 29 Oct 2018 11:34
URI: http://sro.sussex.ac.uk/id/eprint/79751
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