Quasi-Decoupled Arc-Shaped Magnetic Integrated Couplers for Underwater Wireless Power Transfer Systems and its Multiobjective Parameter Optimization Scheme

Owing to the unique shape and spatial constraints of autonomous underwater vehicles (AUVs), designing magnetic couplers presents significant challenges. Current researches on AUV coupler design has produced limited findings regarding the magnetic integration of arc-shaped coils, and there is a notable absence of systematic methods for optimizing parameter design. In terms of the aforementioned challenges, this article proposes arc-shaped magnetic integrated couplers designed for AUV wireless power transfer (WPT) systems, along with a multiobjective parameter optimization plan. The proposed magnetic integration scheme can achieve approximate decoupling among compensation inductors and between compensation inductors and the main coils. This design offers the benefits of reducing spatial leakage magnetic flux and significantly improving system power density. Furthermore, this scheme can be extended to other underwater high-order WPT systems. Subsequently, using output power and efficiency as optimization objectives and migration adaptability as one of the constraints, a multiobjective Salp Swarm Algorithm is applied. Finally, the proposed quasi-decoupled arc-shaped magnetic integrated coupler is applied to an underwater hybrid WPT system with input series and output parallel configuration, and the feasibility of the proposed scheme is validated through experiments. The experimental results demonstrate that, under a rated power of 1.2 kW, the peak efficiency of the system is 92.4%, and the allowable offset ranges in the axial, radial and angular directions are [-20 mm, 20 mm], [0 mm, 20 mm] and [-20°, 20°], respectively.