Design and analysis of a novel CPT system with soft ferromagnetic material cores and electromagnetic resonant coupling for EVs

Duan, Junlong and Wang, William Weiji (2019) Design and analysis of a novel CPT system with soft ferromagnetic material cores and electromagnetic resonant coupling for EVs. Juniper Online Journal Material Science, 5 (4). a555668. ISSN 2575-856X

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Abstract

This paper describes a novel contactless power transfer (CPT) system with geometrically improved H-shape ferromagnetic cores and electromagnetically prospective modelling analysis methods for wireless power transmitting (WPT) applications of electric vehicles (EVs). A CPT prototype, using optimized H-shaped magnetic couplers and series-to-series (SS) compensation, is proposed to address and ensure the maximization of system efficiency, power transfer ratings, and air gaps of coupling coils. By focusing on the main factors such as various system operating frequencies, different geometric designs of coils, changeable inductive coupling distances, electromagnetic field performances and actual phase angle deviations when the inductive coupling system tends to be stable with its waveforms, this small-sized H-shape CPT system has been analytically considered and modelled in a finite-element method (FEM) environment, resulting in a maximum system efficiency of 59.5%, a coil transmitting efficiency of 83.8% and a maximum power output of 42.81 kW on the load end when the resonant coupling of CPT system tends to occur within a range of calculated resonant frequencies, with an air gap of 10 mm. Moreover, the system efficiency and coil transmitting efficiency can reach 47.75% and 77.22%, respectively, and the highest RMS real power to load can achieve 31.95 kW with an air gap of 20 mm. Besides, with an air gap of 30mm, this H-shape CPT system is measured to output 20.39-kW RMS power, along with the maximum system efficiency and coil efficiency of 41.78% and 63.23%, respectively. Furthermore, the improvements of flux linkage, magnetic flux density regarding the actual electromagnetic performance produced and the issues on the calculated natural resonant frequencies have been studied by result analysis and comparison of electromagnetic field parameters generated. In addition, the current limitations and further design considerations have been discussed in this paper.

Item Type: Article
Keywords: Contactless power transfer; Wireless power transmitting; Magnetic resonant coupling; Inductive power transfer; Ferrite, Electric vehicles; Charging efficiency; Finite element method; Maxwell equations; Ferromagnetic; Soft magnetic material
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) > TA0174 Engineering design
T Technology > TA Engineering (General). Civil engineering (General) > TA0401 Materials of engineering and construction. Mechanics of materials
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1001 Production of electric energy or power. Powerplants. Central stations
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK4001 Applications of electric power
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics
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Depositing User: Junlong Duan
Date Deposited: 23 Sep 2019 12:54
Last Modified: 16 Oct 2019 14:30
URI: http://sro.sussex.ac.uk/id/eprint/77094

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