• ALI AGÇAL Electric-Electronic Engineering Department, Suleyman Demirel University, Isparta, Turkey
  • ALTAN KALAY Electric and Energy Department, Yatağan Vocational School, Muğla Sıtkı Koçman University, Muğla, Turkey
  • RAMAZAN CETIN 3 Electric-Electronic Engineering Department, Suleyman Demirel University, Isparta, Turkey




Wireless power transfer (WPT), Underwater vehicle, Inductive coupling, Eddy loss


Wireless power transfer (WPT) through magnetic resonance coupling (MRC) offers a safe and simple solution for underwater (UV) vehicles without being affected by water conductivity. Due to its ease of control in WPT systems, the most suitable topology is Serial-Serial (SS). In this study, square transmitting and receiving coils with dimensions of 40 cm - 40 cm were designed for 3.3 kW power transmission at 85 kHz. The design was studied in the air, pure water, and seawater environments. Three different cases were analyzed with ANSYS Maxwell 3D. The WPT system responded similarly in air and pure water environments. However, it was determined that the eddy current loss increased, the mutual inductance decreased, the coupling factor weakened, and the critical air gap decreased by about 0.2 cm in the seawater environment. The results showed that the WPT system's efficiency was similar for air and pure water but tolerably lower in the marine environment. Further, the health effects of the WPT design were examined through the ANSYS HFSS, in line with the IEEE standard and ICNIRP guidelines.


(1) C. Cai, Y. Zhang, S. Wu, J. Liu, Z. Zhang, L. Jiang, A circumferential coupled dipole-coil magnetic coupler for autonomous underwater vehicles wireless charging applications, IEEE Access, 8, pp. 65432-65442 (2020).

(2) X. Lu, P. Wang, D. Niyato, D.I. Kim, Z. Han, Wireless charging technologies: Fundamentals, standards, and network applications, IEEE Communications Surveys & Tutorials, 18, 2, pp. 1413-1452 (2015).

(3) J. Kim, K. Kim, H. Kim, D. Kim, J. Park, S. Ahn, An efficient modeling for underwater wireless power transfer using Z-parameters. IEEE Transactions on Electromagnetic Compatibility, 61, 6, pp. 2006-2014 (2019).

(4) J. Garnica, R. A. Chinga, & J. Lin, Wireless power transmission: From far field to near field, Proc. of the IEEE, 101, 6, pp. 1321-1331 (2013).

(5) Z. Liu, L. Wang, Y. Guo, C. Tao, Eddy current loss analysis of wireless power transfer system for autonomous underwater vehicles, In 2020 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW), pp. 283-287 (2020).

(6) A. Agcal, S. O. Ozkilic, K. Toraman, Comparison of compensating topologies in two coils resonant wireless power transfer system. Journal of Engineering Research (2022).

(7) C.R. Teeneti, T.T. Truscott, D.N. Beal, Z. Pantic, Review of wireless charging systems for autonomous underwater vehicles. IEEE Journal of Oceanic Engineering, 46, 1, pp. 68-87 (2019).

(8) L. Yang, M. Ju & B. Zhang, Bidirectional undersea capacitive wireless power transfer system. IEEE Access, 7, pp. 121046-121054 (2019).

(9) L. Yang, Y. Zhang, X. Li, J. Jian, Z. Wang, J. Huang, X. Tong, Analysis and design of four-plate capacitive wireless power transfer system for undersea applications. CES Transactions on Electrical Machines and Systems, 5,3, pp. 202-211(2021).

(10) K. Zhang, X. Zhang, Z. Zhu, Z. Yan, B. Song, C.C.Mi, A new coil structure to reduce eddy current loss of WPT systems for underwater vehicles. IEEE Transactions on Vehicular Technology, 68, 1, pp. 245-253 (2018).

(11) M. Ogihara, T. Ebihara, K. Mizutani, N. Wakatsuki, Wireless power and data transfer system for station-based autonomous underwater vehicles. In OCEANS 2015-MTS/IEEE Washington, pp. 1-5 (2015).

(12) D. Wang, S. Cui, J. Zhang, Z. Bie, K. Song, C. Zhu, A novel arc-shaped lightweight magnetic coupler for AUV wireless power transfer, IEEE Transactions on Industry Applications, 58, 1, pp. 1315-1329 (2022).

(13) T. Kan, R. Mai, P.P. Mercier, C.C. Mi, Design and analysis of a three-phase wireless charging system for lightweight autonomous underwater vehicles, IEEE Transactions on power electronics, 33, 8, pp. 6622-6632 (2017).

(14) Y. Zeng, C. Rong, C. Lu, X. Tao, X. Liu, R. Liu, M. Liu, Misalignment insensitive wireless power transfer system using a hybrid transmitter for autonomous underwater vehicles. IEEE Transactions on Industry Applications, 58, 1, pp. 1298-1306 (2022).

(15) A. Agcal, S. Ozcira, N. Bekiroglu, Wireless power transfer by using magnetically coupled resonators. Journal of Wireless Power Transfer: Fundamentals and Technologies, pp. 49-66 (2016).

(16) T. Imura, Y. Hori, Maximizing air gap and efficiency of magnetic resonant coupling for wireless power transfer using equivalent circuit and Neumann formula. IEEE Trans. Ind. Electron, 58, 10, pp. 4746–4752 (2011).

(17) W. Niu, C. Ye, W. Gu, circuit coupling model containing equivalent eddy current loss impedance for wireless power transfer in seawater, 15, pp. 410-416 (2021).

(18) S.S. Mohan, M. del Mar Hershenson, S.P. Boyd, T.H. Lee, Simple accurate expressions for planar spiral inductances, IEEE Journal of solid-state circuits, 34, 10, pp. 1419-1424 (1999).

(19) Z. Duan, Y. X. Guo, D. L. Kwong, Rectangular coils optimization for wireless power transmission. Radio Science, 47, 3, pp. 1-10 (2012).

(20) Kim, Jiseong et al., Coil design and shielding methods for a magnetic resonant wireless power transfer system. Proceedings of the IEEE, 101, 6, pp. 1332-1342 (2013).

(21) ***IEEE, Standard for safety levels with respect to human exposure to electric, magnetic, and electromagnetic fields (0 Hz to 100 kHz) (2019).

(22) ***International Commission on Non-Ionizing Radiation Protection (ICNIRP), Guidelines for limiting exposure to time-varying electric and magnetic fields for low frequencies (1 Hz–100 kHz). Health Phys. Internatıonal Commission on Non‐Ionizing Radiation Protection (2010).






Électronique et transmission de l’information | Electronics & Information Technology

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