Modeling and Analysis of Polarized Couplers under Misalignment for Electric Vehicle Wireless Charging Systems

Wenjie Zhang, Jiancheng Song, Zongwei Liu, Shixuan Lyu, Hui Ren, Ye Zhang and Yuan Song
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Wenjie Zhang: National & Province Joint Engineering Laboratory of Intelligent Electrical Apparatus, Taiyuan University of Technology, Taiyuan 030024, China
Jiancheng Song: National & Province Joint Engineering Laboratory of Intelligent Electrical Apparatus, Taiyuan University of Technology, Taiyuan 030024, China
Zongwei Liu: National & Province Joint Engineering Laboratory of Intelligent Electrical Apparatus, Taiyuan University of Technology, Taiyuan 030024, China
Shixuan Lyu: National & Province Joint Engineering Laboratory of Intelligent Electrical Apparatus, Taiyuan University of Technology, Taiyuan 030024, China
Hui Ren: State Grid Shanxi Electric Power Company Taiyuan Power Supply Company, Taiyuan 030001, China
Ye Zhang: National & Province Joint Engineering Laboratory of Intelligent Electrical Apparatus, Taiyuan University of Technology, Taiyuan 030024, China
Yuan Song: Department of Electrical and Computer Engineering, University of Auckland, 314-390 Khyber Pass Road, Newmarket, Auckland 1141, New Zealand

Energies, 2021, vol. 14, issue 2, 1-15

Abstract: Wireless power transfer (WPT) is becoming popular increasingly in stationary electric vehicle (EV) charging. Various coil structures were proposed to improve the coupling characteristics, and polarized couplers have been proven to have better performance. Considering the varying spatial scales of transmitting and receiving, coils will alter the mutual inductance, further affecting the output power and transmission efficiency; therefore, it is crucial to calculate the mutual inductance of polarized couplers with variable offset for WPT system design. However, given the complex structure and the various excitation conditions of polarized couplers, the solving process based on the finite element model is time-consuming and resource intensive, therefore it is necessary to develop analytical models of mutual inductance for polarized couplers under misalignment. In this paper, the analytical models of the two commonly used polarized couplers with a Double-D polarized coil (DDP) or a Bipolar polarized coil (BP) on both sides under misalignment along any direction under different excitation conditions are proposed based on dual Fourier transformation. The mutual inductance characteristics of the two polarized couplers under misalignment can be investigated based on the proposed analytical models and finite element models, respectively. The results show that the mutual inductance of BP-BP coupler with in-phase current excitation mode is greater and more stable, and the method based on the analytical model is timesaving. Finally, the prototype of the WPT system with the two polarized couplers has been built, and experiments have also been carried out to verify the accuracy of the analytical models.

Keywords: electric vehicle charging; wireless power transfer; polarized coupler; under misalignment; modeling and analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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