Abstract
HTS bulks present a high critical current density which can be used as magnetic shields. Previous works showed that BSCCO bulks can screen magnetic fields up to 0.1 T. For large scale applications like electrical machines, stronger magnetic field is usually needed. In so doing, (RE)BCO materials are more suitable since they can shield much higher magnetic fields. Another key issue concerns the size of the bulks. Nowadays, it is possible to manufacture 150-mm diameter class cylindrical YBCO bulk. In order to get larger magnetic shielding areas, multiple bulk superconductors should be arrayed and stacked in layers. This paper presents experimental results on screening performances of layered YBCO pellets. These results are compared with 2D simulations. The experiments are carried out at 77 K under external magnetic fields of 150 mT. Different topologies are considered: single-layer configuration with 9 square pellets and double-layer configuration with respectively 9 and 4 square pellets. Experimental and simulation results show that a checkerboard of one layer configuration does not fully shield the external magnetic field. Improved shielding properties are obtained when the double-layer configuration is used.
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References
Masson, P., Netter, D., Leveque, J., Rezzoug, A.: Experimental study of a new kind of superconducting inductor. IEEE Trans. Appl. Supercond. 13(2), 2239–2242 (2003)
Netter, D., Leveque, J., Ailam, E., Douine, B., Rezzoug, A., Masson, P.: Theoretical study of a new kind HTS motor. IEEE Trans. Appl. Supercond. 15(2), 2186–2189 (2005)
Rezzoug, A., Leveque, J., Douine, B., Mezani, S.: Superconducting Machines. Non-Conventional Electrical Machines, pp. 191–255. Wiley, New York (2012)
Ailam, E., Netter, D., Leveque, J., Douine, B., Masson, P., Rezzoug, A.: Design and testing of a superconducting rotating machine. IEEE Trans. Appl. Supercond. 17(1), 27–33 (2007)
Moulin, R., Leveque, J., Durantay, L., Douine, B., Netter, D., Rezzoug, A.: Superconducting multi-stacks inductor for synchronous motors using the diamagnetism property of bulk material. IEEE Trans. Ind. Electron. 57(1), 146–153 (2010)
Terao, Y., Sekino, M., Ohsaki, H., Teshima, H., Morita, M.: Magnetic shielding characteristics of multiple bulk superconductors for higher field applications. IEEE Trans. Appl. Supercond. 21(3), 1584–1587 (2011)
Sirois, F., Grilli, F.: Numerical considerations about using FEM to compute AC losses in HTS. IEEE Trans. Appl. Supercond. 18(3), 1733–1742 (2008)
Babu, N.H., Withnell, T.D., Iida, K., Cardwell, D.A.: Strongly coupled artificial bulk HTS grain boundaries with high critical current densities. IEEE Trans. Appl. Supercond. 17(2), 2949–2952 (2007)
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This work was supported in part by the Direction Générale de l’Armement (DGA).
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Douine, B., Male, G., Lubin, T. et al. Improvement of YBCO Superconductor Magnetic Shielding by Using Multiple Bulks. J Supercond Nov Magn 27, 903–907 (2014). https://doi.org/10.1007/s10948-013-2460-5
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DOI: https://doi.org/10.1007/s10948-013-2460-5