Abstract
Conventional docking and charging systems for autonomous underwater vehicles (AUVs) typically suffer from complex structures and rigorous requirements for accurate underwater positioning. In this study, an omnidirectional planar AUV charging platform is proposed, providing an AUV with stable charging performance regardless of its position and direction. A compact single layer planar coil array with ferrite core and moderate overlaps is proposed. Guided by a mathematical model of the eddy current loss, the ferrite shielding thickness is optimised, reducing 95% of the downside eddy current loss with minimal material cost. The layout of the coil arrays is optimised in the magnetic field domain, achieving maximal average magnetic field density with limited fluctuation. Ferrite shielding and the mutual inductance between the coil units are considered in the circuit, high misalignment tolerance and limited eddy current loss are both achieved. The theoretical results are validated by an underwater experiment.
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