Static Levitation Force and Its Thickness Dependence in HTS Tape Stack System
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ORIGINAL PAPER
Static Levitation Force and Its Thickness Dependence in HTS Tape Stack System Cheng Li 1 & Lifeng Zhao 2 & Dajin Zhou 3 & Cuihua Cheng 4 & Yong Zhao 1,2,3 Received: 16 April 2020 / Accepted: 30 May 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract High-temperature superconductors (HTS) have great potential for magnetic levitation applications. Nowadays, coated conductor (CC) tapes are playing an increasingly important role in this field. Compared with HTS bulk materials, CC tapes have a higher critical current density and can be mass-produced, easy to shape, and have other important advantages for magnetic levitation applications. In order to gain an in-depth understanding of the relevant levitation characteristics of CC tapes, we studied the static magnetic levitation force between the permanent magnet and HTS tape stack, with the number of the CC tapes in the stack being 10 to 160. The experimental results show that the magnetic levitation force increases steadily as the thickness of the CC tape stack increases, but gradually reaches saturation. Keywords High-temperature superconductors . Coated conductors tapes . Magnetic levitation . Tape stacks
1 Introduction The high-temperature superconductor (HTS) YBa2Cu3O7-x (YBCO) bulks can trap a high magnetic field over 1 T at liquid nitrogen temperature and exhibits a large levitation force when reacting with permanent magnet guideway (PMG) [1, 2]. Comprehensive studies on the levitation and guidance force, magnetic stiffness, and dynamical properties of YBCO-bulk-based HTS–PMG maglev system have been carried out in the last decade [3–8]. Although the HTS bulk materials have shown many superior properties in magnetic levitation systems, they have also some disadvantages which include a complex fabrication process, high brittleness, low thermal conductivity, and low material productivity and usage. * Yong Zhao [email protected] 1
School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
2
Key Laboratory of Magnetic Levitation Technologies and Maglev Trains, Superconductivity and New Energy Center, Southwest Jiaotong University, Chengdu 610031, China
3
College of Physics and Energy, Fujian Normal University, Fuzhou 350117, China
4
Advanced Studies, Chengdu University, Chengdu 6101060, China
In the recent decade, significant progress has been made in material fabrication and performance improvement for the second generation REBa2Cu3O7-x (REBCO, RE is rareearth) coated conductors tapes (CC tapes). Related applications, including Roebel [9] or stranded stacked tape cable conductor [10], magnetized stacks [11], and large magnetic coil [12–14], are rapidly being developed. Compared with HTS bulk materials, HTS CC tapes with flexible geometrical characteristics, high critical current density and light weight have great research value, and large-scale production of HTS tapes has been commercialized. The HTS tapes provide more choices for the applications of magnetic levitation by
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