Abstract
Magnetic induction communication and wireless power transmission based on magnetic coupling have significant application prospects in underwater environments. Mutual impedance is a key parameter particularly required for the design of the systems. However, mutual impedance is usually extracted from measurements when the coils are processed, which is obviously not conducive to the system optimization in the design phase. In this paper, a model of the mutual impedance of coils immersed in water is established. The magnetic vector potential is expressed in the form of series by artificially setting a boundary, and then the mutual impedance calculation formula of the coils immersed in water is derived. In the analysis, the effect of the conductivity of water, the excitation frequency, and the number of turns of the coils are mainly taken into account. In addition, the variation of the mutual impedance of coils in air and water with axial displacement is also compared. The models can be used to analyze the coil coupling characteristics in the presence of conductive medium, which is helpful for the design process.
Highlights
Magnetic coupling technology based on the concept of magnetic induction (MI) has been widely used in eddy current testing (ECT) [1], MI-based communication [2], and wireless power transmission (WPT) due to its advantages of isolation and convenience [3,4,5]
In order to ensure the accuracy of the coil position during the test, coils are fixed on the inner surface of the dielectric boxes by glue
The inner wall of the water tank is designed with a guide groove, which can be used for fixing the dielectric boxes
Summary
Magnetic coupling technology based on the concept of magnetic induction (MI) has been widely used in eddy current testing (ECT) [1], MI-based communication [2], and wireless power transmission (WPT) due to its advantages of isolation and convenience [3,4,5]. The WPT system used in underwater environments is similar to that used in air. It couples the alternating power generated by the primary side to the secondary side through a pair of coils, and the secondary side obtains direct current (DC) power through rectification. The mutual coupling analysis of the coils in water is an important topic for the design of the underwater WPT system
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