Demagnetization; High-temperature superconductors; Magnetic noise; Magnetic shielding; Magnetization; Superconducting films; Superconducting magnets; transverse magnetic field; superconducting stacked tapes; superconducting motor; superconducting machines
Abstract :
[en] This paper investigates the practical effectiveness of employing superconducting stacked tapes to superconducting electric machinery. The use of superconducting bulks in various practical applications has been addressed extensively in the literature. However, in practice, dramatic decrease in magnetization would occur on superconducting bulks due to the crossed field effect. In our study, we employed the superconducting stacked tapes in a synchronous superconducting motor, which was designed and fabricated in our laboratory, aiming to lessen demagnetization due to crossed field effect in comparison with superconducting bulks. Applying the transverse AC field, the effects of frequency, amplitude, and number of cycles of the transverse magnetic field are discussed. Furthermore, a stack of 16 layers of superconducting tapes is modelled and the consequences of applying the crossed magnetic field on the sample are evaluated. The confrontation between experiments and simulation allows us to thoroughly understand the crossed field effects on stacked tapes. At the end, a preventive treatment, based on the shielding characteristic of superconductor and materials with high permeability, i.e. $mu$-metal and metalic glass, is suggested. On the other hand, the shielding feature of aforementioned materials will hinder the penetration of magnetic field and, consequently, reduction of the demagnetization will be attained.
Baghdadi, M.; University of Cambridge > Department of Engineering > Electric Engineering Division
Ruiz, H. S.; University of Cambridge > Department of Engineering > Electric Engineering Division
Fagnard, Jean-François ; Université de Liège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Zhang, M.; University of Cambridge > Department of Engineering > Electric Engineering Division
Wang, W.; University of Cambridge > Department of Engineering > Electric Engineering Division
Coombs, T. A.; University of Cambridge > Department of Engineering > Electric Engineering Division
Language :
English
Title :
Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field
M. Tomita and M. Murakami, "High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K," Nature, vol. 421, no. 6922, pp. 517-520, Jan. 2003.
G. Krabbes et al., "16 T trapped fields in modified YBaCuO: materials aspects," Phys. C, Supercond., vol. 378-381, pt. 1, pp. 636-640, Oct. 2002.
M. Miki et al., "Development of a synchronous motor with GdBaCuO bulk superconductors as pole-field magnets for propulsion system," Supercond. Sci. Technol., vol. 19, no. 7, pp. S494-S499, Jul. 2006.
C. K. McMichael et al., "Practical adaptation in bulk superconducting magnetic bearing," Appl. Phys. Lett., vol. 60, no. 15, pp. 1893-1895, Feb. 1992.
H. Fujimoto, "Technical issues of a high-Tc superconducting bulk magnet," Supercond. Sci. Technol., vol. 13, no. 6, p. 827, Feb. 2000.
P. Vanderbemden et al., "Remagnetization of bulk high-temperature superconductors subjected to crossed and rotating magnetic fields," Supercond. Sci. Technol., vol. 20, no. 9, p. S174, Aug. 2007.
Z. Hong et al., "Numerical analysis of the demagnetization effect in a superconducting machine with bulk HTS material on the rotor," IEEE Trans. Appl. Supercond., vol. 19, no. 3, pp. 2897-2900, Jun. 2009.
M. Baghdadi, H. S. Ruiz, and T. A. Coombs, "Crossed-magnetic-field experiments on stacked second generation superconducting tapes: Reduction of the demagnetization effects," Appl. Phys. Lett., vol. 104, no. 23, Jun. 2014, Art. ID. 232602.
A. Patel, K. Filar, V. I. Nizhankovskii, S. C. Hopkins, and B. A. Glowacki, "Trapped fields greater than 7 T in a 12 mm square stack of commercial high-temperature superconducting tape," Appl. Phys. Lett., vol. 102, no. 10, Mar. 2013, Art. ID. 102601.
K. Selva and G. Majkic, "Trapped magnetic field profiles of arrays of (Gd,Y)Ba2Cu3Ox superconductor tape in different stacking configurations," Supercond. Sci. Technol., vol. 26, no. 11, Oct. 2012, Art. ID. 115006.
Z. Huang et al., "Control and operation of a high temperature superconducting synchronous motor," IEEE Trans. Appl. Supercond., vol. 23, no. 3, Jun. 2013, Art. ID. 5200204.
E. H. Brandt, "Superconductors of finite thickness in a perpendicular magnetic field: Strips and slabs," Phys. Rev. B Condens. Matter, vol. 54, no. 6, pp. 4246-4264, Aug. 1996.
J. R. Clem, M. Weigand, J. H. Durrell, and A. M. Campbell, "Theory and experiment testing flux-line cutting physics," Supercond. Sci. Technol., vol. 24, no. 6, Mar. 2011, Art. ID. 062002.
G. P. Mikitik and E. H. Brandt, "Vortex shaking in rectangular superconducting platelets," Phys. Rev. B, vol. 69, no. 13, Apr. 2004, Art. ID. 134521.
J. F. Fagnard et al., "Use of second generation coated conductors for efficient shielding of dc magnetic fields," J. Appl. Phys., vol. 108, no. 1, Jul. 2010, Art. ID. 013910.
J. Kvitkovic, S. Pamidi, and J. Voccio, "Shielding AC magnetic fields using commercial YBa2Cu3O7-coated conductor tapes," Supercond. Sci. Technol., vol. 22, no. 12, Oct. 2009, Art. ID. 125009.
V. Serban, C. Codrean, D. Utu, and A. Ercuta, "Fe-based bulk metallic glasses used for magnetic shielding," J. Phys., Conf. Ser., vol. 144, no. 1, 2009, Art. ID. 012037.
