Journal of Radio Electronics. eISSN 1684-1719. 2025. №11

Full text in Russian (pdf)

DOI: https://doi.org/10.30898/1684-1719.2025.11.48

INFLUENCE OF FIELD COOLING HEIGHT
ON THE LEVITATION CHARACTERISTICS OF AN HTS TAPE STACK

I.V. Martirosian, D.A. Aleksandrov, A.S. Starikovskii, M.A. Osipov, S.V. Pokrovsky

National Research Nuclear University, Moscow Engineering Physics Institute,
115409, Russia, Moscow, Kashirskoye Shosse, 31

The paper was received October 30, 2025.

Abstract. Contactless magnetic suspensions based on high-temperature superconductors (HTS) are of particular interest due to their ability to provide stable levitation without active control systems. One of the key factors affecting the performance of such systems is the field cooling height (FCH), which determines the distribution of the trapped magnetic flux and, consequently, the magnitude and stability of the levitation forces. The aim of this work is to experimentally and numerically investigate the effect of FCH on the vertical and lateral characteristics of a simple HTS suspension. The object of study is a basic configuration of an HTS suspension consisting of a stack of composite YBCO HTS tapes and a stack of cylindrical NdFeB permanent magnets. Experiments were carried out during cooling with liquid nitrogen for various FCH values in the range of 6–60 mm. Numerical simulations were performed using the finite element method in the A–T formulation with identical geometric parameters. Vertical and lateral load characteristics of the HTS suspension were obtained. It was found that the maximum vertical levitation force increases nonlinearly with FCH, while the maximum restoring force under lateral displacement decreases. A pronounced inverse correlation between these forces was observed. The identified dependencies reflect the balance between the load-bearing capacity and stability of the suspension, determined by the interaction of the superconductor with the non-uniform magnetic field. The obtained results can be used to optimize the parameters of HTS bearings, supports, and transport platforms, as well as to develop new methods for controlling their levitation characteristics.

Key words: levitation force, HTS tape stacks, HTS bearing, HTS suspension, HTS composites, field cooling height, FCH.

Financing: This study was supported by the Russian Science Foundation, project No. 23-19-00394, https://rscf.ru/project/23-19-00394/

Corresponding author: Martirosian Irina Valerievna, mephizic@gmail.com

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For citation:

Martirosian I.V., Aleksandrov D.A., Starikovskii A.S., Osipov M.A., Pokrovsky S.V. Influence of field cooling height on the levitation characteristics of an HTS tape stack. // Journal of Radio Electronics. – 2025. – №. 11. https://doi.org/10.30898/1684-1719.2025.11.48 (In Russian)