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Levitation Force Relaxation of HTS Bulk above NdFeB Guideways at Different Approaching Speeds

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Abstract

The zero-field cooling levitation force relaxation of the YBCO bulk above two types of NdFeB guideways, which were used in the high-temperature superconducting maglev vehicle system, was studied experimentally when the bulk moved towards the guideways at different speeds. In this experiment, a sample with the diameter of 50 mm and thickness of 15 mm was used; the time range in the relaxation measurements was from 0 s to 200 s. As a result, a nearly linear logarithmic decay of the levitation forces with time was observed. It was found that the influence of the approaching speeds on the levitation force relaxation is different, and that the levitation force decay is closely related to the guideway structures. Based on the monopole peak PMG, the approaching speeds will influence more the levitation force decay than the multipole Halbach. So the maglev vehicle above mutipole Halbach structure PMG will work more stably than that above the monopole peak PMG.

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Authors and Affiliations

  1. Applied Superconductivity Laboratory, Southwest Jiaotong University, P.O. Box 152, Chengdu, Sichuan, 610031, P.R. China

    Yujie Qin, Yiyun Lu, Suyu Wang & Jiasu Wang

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  1. Yujie Qin
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  2. Yiyun Lu
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  3. Suyu Wang
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  4. Jiasu Wang
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Correspondence to Yujie Qin.

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Qin, Y., Lu, Y., Wang, S. et al. Levitation Force Relaxation of HTS Bulk above NdFeB Guideways at Different Approaching Speeds. J Supercond Nov Magn 22, 511–516 (2009). https://doi.org/10.1007/s10948-009-0449-x

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  • DOI: https://doi.org/10.1007/s10948-009-0449-x

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