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Uniform magnetic field by changing the current distribution on the planar coil for displacement‐insensitive wireless power transfer/near field communication
Author(s) -
Shen Laiwei,
Tang Wanchun,
Xiang Huiling,
Zhuang Wei
Publication year - 2015
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28859
Subject(s) - electromagnetic coil , wireless power transfer , coil noise , magnetic field , spiral (railway) , electrical engineering , field (mathematics) , search coil , microwave , acoustics , planar , engineering , electronic engineering , physics , rogowski coil , telecommunications , mechanical engineering , computer science , magnetic flux , mathematics , computer graphics (images) , quantum mechanics , pure mathematics
In either inductive or strongly coupled magnetic resonance type wireless power transfer, the uniformity of magnetic field distribution near the transmitting coil is urgent needed as it would affect the stability of transfer efficiency when the receiving coil is moving. In this article, we proposed a new coil structure to achieve uniform magnetic field based on the relationship between the magnetic field distribution and current distribution of a coil structure. The coil is constructed of three or more spiral coils in series, where each spiral coil has a different current through a novel winding structure. The design procedure is presented, and the improved performance is verified by experiment. Compared with previous literatures, this proposed coil can generate a better uniform magnetic field distribution. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:424–427, 2015