Nested three-layer optimisation method for magnetic coils used in 3 kW vehicle-mounted wireless power transfer system

Zhenshi Wang; Xuezhe Wei; Haifeng Dai

Nested three-layer optimisation method for magnetic coils used in 3 kW vehicle-mounted wireless power transfer system

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Author(s): Zhenshi Wang ^{1, 2} ; Xuezhe Wei ¹ ; Haifeng Dai ^{1, 2}
- Affiliations: 1: School of Automotive Studies, Tongji University, No. 4800, Caoan Road, Shanghai 201804, People's Republic of China ;
  2: National Engineering Laboratory for New Energy Automotives and Powertrain Systems, Tongji University, No. 4800, Caoan Road, Shanghai 201804, People's Republic of China
Source: Volume 9, Issue 13, 26 October 2016, p. 2562 – 2570
DOI: 10.1049/iet-pel.2015.0840 , Print ISSN 1755-4535, Online ISSN 1755-4543

Received 23/10/2015, Accepted 18/08/2016, Revised 07/08/2016, Published 26/10/2016

Wireless power transfer is becoming more and more popular, especially for the charging design of electric vehicles. In this study, a novel nested three-layer optimisation method based on finite element model (FEM) is proposed to determine the structure of magnetic coils, which can increase the coupling coefficient, and hence, improve the transfer efficiency. The boundary conditions which consider practical situations for electric vehicles are first elaborated, then the optimisation flow is detailed and further analysed. Two magnetic coils are fabricated based on the optimised structure parameters, and their electric parameters, including self-inductances, mutual inductances as well as parasitic resistances, are measured and compared with those extracted from FEM, in addition, the magnetic flux densities around magnetic coils are also analysed. At last, a 3 kW prototype with 95% efficiency over a 20 cm transfer distance is achieved to validate this research results.

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Nested three-layer optimisation method for magnetic coils used in 3 kW vehicle-mounted wireless power transfer system

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