A Comparative Study on Overall Efficiency of 2-Dimensional Wireless Power Transfer Systems Using Rotational and Directional Methods

Hanwei Wang, Cheng Zhang, Yun Yang, Rebecca Hui Wen Liang, S. Y. Hui

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Two-dimensional (2-D) wireless power transfer (WPT) systems can be controlled by either the directional method or the rotational method. The rotational method refers to the use of omnidirectional transmitter generating rotational flux regardless of the load positions, while the directional method refers to the use of omnidirectional transmitter generating magnetic flux directly toward the power-consuming load directions. This paper compares the overall efficiency of the two methods for 2-D WPT systems. Theoretical analysis reveals that (i) the directional WPT can be more efficient than the rotational WPT with either single or multiple loads when the magnetic field vector is controlled within the feasible zones; (ii) the efficiency difference between the two methods are more significant when the dimensions of the receiver coils are smaller. Both simulation and experimental results are consistent in validating the two discoveries. They indicate that the averaged efficiency of the directional method is at least 5% higher than that of the rotational one.

Original languageEnglish
JournalIEEE Transactions on Industrial Electronics
Publication statusPublished - 8 Jan 2021


  • 2-dimensional (2-D) wireless power transfer (WPT)
  • Amplitude modulation
  • Control systems
  • directional method
  • Magnetic fields
  • Receivers
  • rotational method
  • Transmitters
  • Wireless communication
  • Wireless power transfer

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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