4.7 Article

Lateral and angular misalignments of coil in wireless power transfer system

Journal

SENSORS AND ACTUATORS A-PHYSICAL
Volume 341, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2022.113577

Keywords

Wireless power transfer; Magnetic shielding; Lateral misalignment; Angular misalignment; Coil

Funding

  1. National Key Research and Development Program of China [2018YFB2003103]
  2. Outstanding Young Talents Support Plan of Shanxi Province
  3. Young Sanjin Scholar Distinguished Professor Plan of Shanxi Province
  4. Innovative Research Group Project of National Natural Science Foundation of China [51821003]
  5. Shanxi 1331 Project keys subjects Construction

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This study theoretically investigates the transmission efficiency of coils with lateral and angular misalignments. Modeling and experiments show that using a magnetic isolation material on the coil can effectively improve the electromagnetic field intensity of the system, resulting in a more efficient wireless charging system.
Wireless power transfer requires the transmission and reception of energy through coils arranged coaxially and the direction does not change to ensure maximum transmission efficiency and power. However, in actual working environments, coils have lateral and angular misalignments, thereby reducing the transmission performance. In this study, we investigate the transmission efficiency of coils and the mutual inductance of the lateral and angular misalignments theoretically. Coils with lateral and angular misalignments are modeled with the Maxwell simulation software. Finally, a 3D test experimental platform is built. The experimental results show that the use of a magnetic isolation material on the coil can effectively improve the electromagnetic field intensity of the system. The coupling coefficient of the two coils is increased by more than 15%. At a coupling distance of 5 mm, the coupling mechanism with ferrite is approximately 10% more efficient than that without ferrite. Furthermore, it shows that when the misalignment is large, the magnetic isolation material can significantly improve the efficiency of the wireless charging system.

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