Influences of Coil Radius on Effective Transfer Distance in WPT System

Yang Li, Shan Jiang, Xue-Li Liu, Quan Li, Weihao Dong, Jiaming Liu, Xin Ni

Research output: Contribution to journalArticlepeer-review


The improvement of effective transfer distance is significant for wireless power transfer (WPT) via coupled magnetic resonances, with coil radius being the most important influencing factor. To study the relationship between effective transfer distance and coil radius, a model of WPT is established at first. Based on analyses of circuit and magnetic field, the influencing factors for effective transfer distance are obtained. Second, the models of WPT are constructed using software COMSOL, and the influences of Tx and Rx coil radius on the effective transfer distance are studied in detail. In addition, they are not proportional and the coil impedance is the most important factor. On this basis, a coil design method is proposed. Finally, an experiment device was built, and experimental results were well consistent with the theoretical analysis, showing the rationality and effectiveness of the proposed method.
Original languageEnglish
JournalIEEE Access
Early online date26 Aug 2019
Publication statusE-pub ahead of print - 26 Aug 2019


  • coil radius
  • distance characteristics
  • effective transfer distance
  • wireless power transfer (WPT)


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