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
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