Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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High misalignment‑tolerant wireless charging magnetic coupling system with combined pickups for UAVs

  • Nenghong Xia (College of Electrical Engineering, Shanghai University of Electric Power) ;
  • Shuang Yan (College of Electrical Engineering, Shanghai University of Electric Power) ;
  • Fangshen Li (College of Electrical Engineering, Shanghai University of Electric Power) ;
  • Huaqi Ma (College of Electrical Engineering, Shanghai University of Electric Power) ;
  • Mengqi Chen (College of Electrical Engineering, Shanghai University of Electric Power) ;
  • Xike Mao (College of Electrical Engineering, Shanghai University of Electric Power)
  • Received : 2024.01.29
  • Accepted : 2024.09.14
  • Published : 2025.04.20
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Abstract

This paper proposes a wireless charging magnetic coupling system for unmanned aerial vehicles (UAV) that is highly misalignment adaptable. The receiver is designed as a combined pickup with four receiving solenoids installed on the four legs of the UAV to improve the rotational misalignment tolerance of the system. They pick up magnetic energy in four directions and are close enough to the transmitting coil to achieve highly efficient coupling while being far enough from the UAV cabin to avoid electromagnetic interference from wireless charging leakage. The transmitter is an array structure based on a series magnetic field consisting of rectangular coils connected in sequence and wound in reverse, with a series magnetic field generated by any two adjacent coils. Several UAVs are placed separately at intervals on the transmitting coil to ensure practicality and improve the system transmission efficiency. Considering the complexity of connecting multiple coils of the transmitter, quad rectangular coils (QD coil) were connected in reverse series as a unit and used as the transmitting coil to investigate the feasibility of the system. By optimizing the chamfer radian of the rectangular coil in the transmitter, the receiver becomes highly compatible with it, enabling the system to have a strong anti-offset capability. A 70-W prototype was developed to validate the proposed system and the experiment results show that under free rotation, the mutual inductance change rate of the system is within 0.5%. At the maximum load placement density, the transmission efficiency of the system can reach 90.9%.

Keywords

Acknowledgement

This work was supported by Natural Science Foundation of Shanghai under Grant 23ZR1424800.

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