Levitation Capability of a Bulk YBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7-x&lt;/sub&gt; with NdFeB Guideway by Two Magnetization Methods

Zheng, Jun; Li, Jing; Deng, Zigang; Song, Hong Hai; Wang, Su Yu; Wang, Jia Su

doi:10.4028/www.scientific.net/msf.546-549.2079

Cited by 10 publications

(1 citation statement)

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“…Recently, Dull et al have reported that two 25 mm diameter bulk samples of GdBaCuO HTSC reinforced with shrink-fit steel trapped a record-high field of 17.6 T at 26 K [15]. Consequently, a pre-magnetized bulk high-temperature superconducting magnet (BHTSM) with a higher trapped magnetic field could be a good candidate to improve the relevant levitation performance if it were applied in the PMG magnetic field of an HTS maglev system [16][17][18]. In contrast to the PMG material, the trapped field of the BHTSM is sustained by the supercurrent induced during the magnetizing process and is sensitive to disturbance from the applied external magnetic field from the experimental PMG.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and levitation characteristics of bulk high-temperature superconducting magnets above a permanent magnet guideway

Zheng

et al. 2016

Supercond. Sci. Technol.

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Due to the large levitation force or the large guidance force of bulk high-temperature superconducting magnets (BHTSMs) above a permanent magnet guideway (PMG), it is reasonable to employ pre-magnetized BHTSMs to replace applied-magnetic-field-cooled superconductors in a maglev system. There are two combination modes between the BHTSM and the PMG, distinguished by the different directions of the magnetization. One is the S-S pole mode, and the other is the S-N pole mode combined with a unimodal PMG segment. A multi-point magnetic field measurement platform was employed to acquire the magnetic field signals of the BHTSM surface in real time during the pre-magnetization process and the re-magnetization process. Subsequently, three experimental aspects of levitation, including the vertical movement due to the levitation force, the lateral movement due to the guidance force, and the force relaxation with time, were explored above the PMG segment. Moreover, finite element modeling by COMSOL Multiphysics has been performed to simulate the different induced currents and the potentially different temperature rises with different modes inside the BHTSM. It was found that the S-S pole mode produced higher induced current density and a higher temperature rise inside the BHTSM, which might escalate its lateral instability above the PMG. The S-N pole mode exhibits the opposite characteristics. In general, this work is instructive for understanding and connecting the magnetic flux, the inner current density, the levitation behavior, and the temperature rise of BHTSMs employed in a maglev system.

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