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Optimal Efficiency Wireless Power Transfer System Based on a Polygonal Magnetic Coupler
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DOI：10.1109/jestpe.2026.3685953.png)
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Abstract
En 中文
Traditional autonomous underwater vehicles (AUVs) commonly rely on the surface recovery or wet-plugging for energy replenishment. These methods suffer from poor concealment, susceptibility to charging port damage, and low-operational efficiency, making it difficult to meet the demands of AUVs for long-duration and large-scale underwater operations. To address the coupling misalignment issues resulting from insufficient docking accuracy of AUVs, this article designs a regular polygonal magnetic coupler with good misalignment tolerance in both the axial and circumferential directions. A mathematical model of its coupling coefficient is established based on this coupler structure, and nondominated sorting genetic algorithm II (NSGA-II) is employed to optimize the structural parameters of the coupler. In response to the design requirements for constant-current (CC)/constant-voltage (CV) charging modes of AUVs and the problem of decreased energy transfer efficiency due to variations in the charging load, a fuzzy proportional-integral-derivative (PID) phase shift control strategy, and an optimal efficiency control method based on a Zeta circuit are proposed. Experimental results show that the prototype system can maintain an energy transfer efficiency of over 84.8% (with a maximum output power of 437 W) in both air and seawater. The phase shift control strategy offers the advantage of fast dynamic response, and the optimal efficiency control method ensures that high-efficiency wireless power transfer is maintained even when the AUV’s battery operating conditions change dynamically.
Keywords:
Autonomous underwater vehicle (AUV)
magnetic coupler
optimal efficiency
phase shift control strategy
wireless power transfer
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