Research on the High‐Performance Magnetic Coupler Based on Lignocellulose Composite for Wireless Charging System

ABSTRACT This article proposes a magnetic coupler based on a lignocellulose composite core for unmanned aerial vehicle (UAV) wireless charging systems, addressing the limitations of conventional magnetic cores, including excessive weight, poor plasticity, lack of eco‐friendliness, and incompatibility with the specific structure of UAVs, while improving the transmitter configuration to enhance misalignment tolerance. First, the system circuit is presented, and the configuration of the magnetic coupler is analyzed. Second, the lignocellulose composite core is designed, and its fabrication method is introduced, followed by a comparison with the ferrite. Third, a misalignment‐tolerant magnetic coupler adaptable to the UAV structure is analyzed and designed, and the coupler parameters are optimized using the NSGA‐II algorithm, and its feasibility is verified through simulation. Finally, an experimental platform is constructed. Results demonstrate that, within a 90 mm diagonal square horizontal misalignment range and under 360° rotation, mutual inductance fluctuations remain within ±5%. The system achieves charging power of 115 W and efficiency of 81.2% in the aligned state.