Design of a Planar, Concentric Coil for the Generation of a Homogeneous Vertical Magnetic Field Distribution
Keywords:
Magnetic field, planar coil, self inductance, uniform field distributionAbstract
This paper describes an algorithm to design a planar, concentric coil that generates a homogeneous vertical magnetic field distribution, with a target self inductance. The algorithm consists of several steps. The first step is the random generation of a large set of concentric coils, taken into consideration a number of boundary conditions such as the outer dimensions and the radius of the conducting wire. The optimal coil is found from this set after a twofold selection, namely on the self inductance value and on the uniformity of the vertical magnetic field, which was evaluated using a cost function. The algorithm is straightforward and based on closed expressions, which leads to a rapid execution of the procedure. We evaluated the algorithm on a representative reference configuration. The best coil of the large set was selected and the quasi-uniform field distribution of this coil was confirmed by experimental verification.
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References
N. Shinohara, “The wireless power transmission: Inductive coupling, radio wave, and resonance coupling,” Wiley Interdisciplinary Reviews: Energy and Environment, vol. 1, no. 3, pp. 337-346, 2012.
X. Jin, J. M. Caicedo, and M. Ali, “Near-field wireless power transfer to embedded smart sensor antennas in concrete,” Applied Computational Electromagnetics Society Journal, vol. 30, no. 3, 2015.
M. H. Misran, A. Rahim, S. Kamal, A. A. Eteng, and G. A. Vandenbosch, “Assessment of kaptonbased flexible antenna for near field wireless energy transfer,” Applied Computational Electromagnetics Society Journal, vol. 32, no. 1, 2017.
M. H. Salleh, N. Seman, and R. Dewan, “The investigation of substrate’s dielectric properties for improving the performance of Witricity devices,” Applied Computational Electromagnetics Society Journal, vol. 32, no. 1, 2017.
G. Orecchini, L. Yang, A. Rida, F. Alimenti, M. M. Tentzeris, and L. Roselli, “Green technologies and RFID: Present and future,” Applied Computational Electromagnetics Society Journal, vol. 25, no. 3, pp. 230-238, 2010.
V. Coskun, K. Ok, and B. Ozdenizci, NFC Essentials in Near Field Communication: From Theory to Practice. John Wiley & Sons, Ltd, Chichester, UK, 2012.
E. Waffenschmidt, “Homogeneous magnetic coupling for free positioning in an inductive wireless power system,” Emerging and Selected Topics in Power Electronics, IEEE Journal of, vol. 3, no. 1, pp. 226-233, 2015.
W. X. Zhong, X. Liu, and S. R. Hui, “A novel single-layer winding array and receiver coil structure for contactless battery charging systems with free-positioning and localized charging features,” Industrial Electronics, IEEE Transactions on, vol. 58, no. 9, pp. 4136-4144, 2011.
X. Shi, C. Qi, M. Qu, S. Ye, and G. Wang, “Effects of coil locations on wireless power transfer via magnetic resonance coupling,” Applied Computational Electromagnetics Society Journal, vol. 31, no. 3, 2016.
E. Waffenschmidt and T. Staring, “Limitation of inductive power transfer for consumer applications,” Power Electronics and Applications, EPE'09. 13th European Conference on, IEEE, pp. 1-10, 2009.
S. Chopra and P. Bauer, “Driving range extension of EV with on-road contactless power transfer—A case study,” Industrial Electronics, IEEE Transactions on, vol. 60, no. 1, pp. 329-338, 2013.
T. E. Stamati and P. Bauer, “On-road charging of electric vehicles,” Industrial Electronics, In Transportation Electrification Conference and Expo (ITEC), IEEE, pp. 1-8, 2013.
S. C. Chen and V. Thomas, “Optimization of inductive RFID technology,” Electronics and the Environment, Proceedings of the 2001 IEEE International Symposium on, pp. 82-87, 2001.
N. Stevens, L. Destrycker, and W. Verschelde, “Procedure to calculate the inductance of a circular loop near a metal plate,” Przegląd Elektrotechniczny, vol. 87, no. 9A, pp. 255-258, 2011.
J. Kim, H.-C. Son, and Y.-J. Park, “Multi-loop coil supporting uniform mutual inductances for freepositioning WPT,” Electronics Letters, vol. 49, no. 6, pp. 417-419, 2013.
Z. Zhang and K. T. Chau, “Homogeneous wireless power transfer for move-and-charge,” IEEE Transactions on Power Electronics, vol. 30, no. 11, pp. 6213-6220, 2015.
J. J. Casanova, Z. N. Low, J. Lin, and R. Tseng, “Transmitting coil achieving uniform magnetic field distribution for planar wireless power transfer system,” Radio and Wireless Symposium, RWS '09, pp. 530-533, 2009.
D. Yinliang, S. Yuanmao, and G. Yougang, “Design of coil structure achieving uniform magnetic field distribution for wireless charging platform,” IEEE Power Electronics Systems and Applications (PESA), 4th International Conference on, pp. 1-5, 2011.
L. Xun and S. Y. R. Hui, “Optimal design of a hybrid winding structure for planar contactless battery charging platform,” Power Electronics, IEEE Transactions on, vol. 23, no. 1, pp. 455-463, 2008.
W. S. Lee, H. L. Lee, K. S. Oh, and J. W. Yu, “Uniform magnetic field distribution of a spatially structured resonant coil for wireless power transfer,” Applied Physics Letters, vol. 100, no. 21, 2012.
B. Minnaert and N. Stevens, “An improved algorithm for the creation of homogeneous magnetic field distributions,” Electromagnetics in Advanced Applications (ICEAA), International Conference on, IEEE, pp. 517-520, 2015.
M. A. Azpúra, “A semi-analytical method for the design of coil-systems for homogeneous magnetostatic field generation,” Progress In Electromagnetics Research B, vol. 37, pp. 171-189, 2012.
J. G. Van Bladel, Electromagnetic Fields. John Wiley & Sons, 2007.
C. M. Zierhofer and E. S. Hochmair, “Geometric approach for coupling enhancement of magnetically coupled coils,” Biomedical Engineering, IEEE Transactions on, vol. 43, no. 7, pp. 708-714, 1996.
N. Stevens, “Normalisation of magnetic field distribution generated by circular current loop,” Electronics Letters, vol. 50, no. 17, pp. 1234-1236, 2014.
Wireless Power Consortium, The Qi Wireless Power Transfer System Power Class 0 Specification, Part 4: Reference Designs, Ver. 1.2.2, 2016.
Wireless Power Consortium, System Description Wireless Power Transfer, vol. 1, Part 1, Ver. 1.0, 2010.
