A Simulation on Levitation Force and Guidance Force of the HTSC Bulk Under the Permanent Magnetic Guideway’s Stochastic Excitation

• Published in: Journal of superconductivity and novel magnetism Vol. 34; no. 12; pp. 3099 - 3114
• Main Authors: Yang, Jungang, Chi, Maoru, Wu, Xingwen, Ji, Yuang, Liang, Shulin
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2021
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconductivity; Guidance force; Levitation force; Lateral excitation; Vertical excitation; HTSC
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-021-05969-w

In the actual operation of the high temperature superconducting (HTSC) maglev, due to the irregularity of the permanent magnetic guideway (PMG), the superconducting bulk always fluctuates in a small range. In order to explore this influence on the levitation force and guidance force, this paper considers that the superconducting bulk drops from the field cooling height (FCH) to the working height (WH), then maintains for a while and returns to the FCH, during the whole process of which the PMG has been subjected to the stochastic lateral and vertical excitations. Two E-J’s constitutive relations are used in COMSOL Multiphysics 5.6, and compared with the model without excitations. The results show that for the levitation force, the lateral excitation mainly affects its amplitude, while the vertical excitation mainly affects its overall trend and position of the peak value. The more intense the excitation’s fluctuation, the weaker the effect of the magnetic flux flow. For the guidance force, the lateral excitation mainly affects its amplitude and fluctuation’s intensity, while the vertical excitation’s influence is so small that can be neglected. When the superconducting bulk moves near the peak value, the effect of magnetic flux flow is particularly obvious, while near the equilibrium position, the effect is weak. On the whole, the magnetic flux flow has a distinct impact on the vertical excitation than on the lateral excitation. When without excitations, the magnetic flux flow is relatively obvious. These results reveal the rules providing the reference for the design of the HTSC maglev.