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ISSN: 2772-8307
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cited:12
Pulsed field magnetization of multiple bulks used as field pole of a high-temperature superconducting rotating machine
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Article Number:Article 100041
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Abstract
Corresponding email:acau001@kaiyodai.ac.jp
An array of three GdBa2Cu3O7-δ bulk high-temperature superconductors (HTS) that mimic the field pole of a high-power superconducting motor had been magnetized by pulsed field magnetization (PFM) while cooled by liquid nitrogen. The bulk array was magnetized by a passive PFM technique using three vortex-type coils placed over each individual bulk and connected in series. The trapped magnetic flux density distribution was comparable to the distribution obtained with more traditional quasi-static magnetization such as field-cooling. This suggests that the use of PFM technique on arrays of HTS bulks is possible. PFM has also been performed using each coil individually, to magnetize each bulk sequentially. The magnetization sequences showed a maximum reduction of the peak trapped magnetic flux density of 12% due to the demagnetization effect of the magnetization sequence, while the trapped magnetization distribution was improved.
cited:31
Mechanical characterization of a 10-MJ HTS SMES magnet wound by quasi-isotropic strands and directly stacked tape conductors
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Article Number:Article 100042
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Abstract
Corresponding email:yswang@ncepu.edu.cn
A 10-MJ-class superconducting magnetic energy storage (SMES) magnet is designed and optimized in this study using quasi-isotropic strands and stacked-tape conductors. In order to ensure the stable operation of SMES systems, it is necessary to evaluate the mechanical properties risk caused by the Lorentz force. Therefore, in this study, the magnetic stress caused by the Lorentz force is analyzed using the finite element method. The results show that the tapes near the inner diameter of the magnet are subjected to a higher stress and require considerable support. Although the maximum stress is increased by two times due to the presence of the screening current, it is within the safety range. The screening current does not vanish after the discharge process. After discharge, the coil is still subjected to a stress on the other of a few MPa.
cited:4
Erratum to “Preparation of Bi-2212/YBCO heterostructure and their interfacial characters” [Superconductivity 4 (2022) 100030]
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Article Number:Article 100035
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Review