Journal ArticleDOI
Superconductor bearings, flywheels and transportation
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In this article, the authors present the present status of high temperature superconductors (HTS) and of bulk superconducting magnet devices, their use in bearings, in flywheel energy storage systems (FESS) and linear transport magnetic levitation (Maglev) systems.Abstract:
This paper describes the present status of high temperature superconductors (HTS) and of bulk superconducting magnet devices, their use in bearings, in flywheel energy storage systems (FESS) and linear transport magnetic levitation (Maglev) systems. We report and review the concepts of multi-seeded REBCO bulk superconductor fabrication. The multi-grain bulks increase the averaged trapped magnetic flux density up to 40% compared to single-grain assembly in large-scale applications. HTS magnetic bearings with permanent magnet (PM) excitation were studied and scaled up to maximum forces of 10 kN axially and 4.5 kN radially. We examine the technology of the high-gradient magnetic bearing concept and verify it experimentally. A large HTS bearing is tested for stabilizing a 600 kg rotor of a 5 kWh/250 kW flywheel system. The flywheel rotor tests show the requirement for additional damping. Our compact flywheel system is compared with similar HTS–FESS projects. A small-scale compact YBCO bearing with in situ Stirling cryocooler is constructed and investigated for mobile applications. Next we show a successfully developed modular linear Maglev system for magnetic train operation. Each module levitates 0.25t at 10 mm distance during one-day operation without refilling LN2. More than 30 vacuum cryostats containing multi-seeded YBCO blocks are fabricated and are tested now in Germany, China and Brazil.read more
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Journal ArticleDOI
Review of Flywheel Energy Storage Systems structures and applications in power systems and microgrids
TL;DR: The Flywheel Energy Storage System (FESS) as mentioned in this paper is an electromechanical energy storage system which can exchange electrical power with the electric network, it consists of an electrical machine, back-to-back converter, DC link capacitor and a massive disk.
Journal ArticleDOI
A High-Temperature Superconducting Maglev Ring Test Line Developed in Chengdu, China
Zigang Deng,Weihua Zhang,Jun Zheng,Yu Ren,Donghui Jiang,Zheng Xinxin,Zhang Jianghua,Pengfei Gao,Qunxu Lin,Bo Song,Changyan Deng +10 more
TL;DR: In this article, the second-generation HTS Maglev vehicle system is highlighted by the cost-performance and the wireless multiparameter onboard monitoring function, which can display parameters of levitation weight, levitation height, running speed, acceleration, lateral offset, online position, and total running distance.
Journal ArticleDOI
A High-Temperature Superconducting Maglev-Evacuated Tube Transport (HTS Maglev-ETT) Test System
TL;DR: In this article, the authors developed the first proof-of-principle prototype of a 45m-long high-temperature superconducting Maglev evacuated tube transport (HTS Maglev-ETT) test system, called the “Super-Maglev,” based on the passive self-stable HTS MAGLEVER conceived in our group in 2000.
Journal ArticleDOI
A Full Scale Superconducting Magnetic Levitation (MagLev) Vehicle Operational Line
Guilherme Gonçalves Sotelo,R. A. H. de Oliveira,F. Costa,D. H. N. Dias,R. de Andrade,Richard M. Stephan +5 more
TL;DR: In this paper, the authors describe the construction and main components of a full-scale superconducting magnetic levitation vehicle, comprising four 1.5-m-long wagons, which will travel a short test line of 200 meters, connecting two buildings inside the campus of the Federal University of Rio de Janeiro.
Journal ArticleDOI
An overview of rotating machine systems with high-temperature bulk superconductors
TL;DR: A review of recent advancements in rotating machines with bulk high-temperature superconductors (HTS) can be found in this article, where the key issues of bulk HTS machines, including material progress of bulk HSTS, in-situ magnetization, and cooling together with AC loss at lowtemperature operation are discussed.
References
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Journal ArticleDOI
High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K
Masaru Tomita,Masato Murakami +1 more
TL;DR: A post-fabrication treatment is presented that improves the mechanical properties as well as thermal conductivity of a bulk Y-Ba-Cu-O magnet, thereby increasing its field-trapping capacity and thermal stability and internal mechanical strength.
Journal ArticleDOI
The first man-loading high temperature superconducting Maglev test vehicle in the world
Jiasu Wang,Suyu Wang,Youwen Zeng,Haiyu Huang,Fang Luo,Zhipei Xu,Qixue Tang,Guobin Lin,Cuifang Zhang,Zhongyou Ren,Guomin Zhao,Degui Zhu,Shaohua Wang,He Jiang,Min Zhu,Changyan Deng,Pengfei Hu,Chaoyong Li,Fang Liu,Jisan Lian,Xiaorong Wang,Lianghui Wang,Xuming Shen,Xiaogang Dong +23 more
TL;DR: The first man-loading high temperature superconducting Maglev test vehicle in the world is reported in this paper, where the onboard superconductors are melt-textured YBaCuO bulks.
Journal ArticleDOI
Superconductively levitated transport system - the SupraTrans project
Ludwig Schultz,O. de Haas,P. Verges,C. Beyer,S. Rohlig,H. Olsen,Lars Kuhn,Dietmar Berger,U. Noteboom,U. Funk +9 more
TL;DR: SupraTrans as discussed by the authors is an innovative transportation concept based on the principle of superconductive magnetic levitation, which uses the flux pinning in high temperature superconductors (HTS) to stabilize the lateral and vertical position of the vehicle on the magnetic track.
Journal ArticleDOI
Vertical and lateral forces between a permanent magnet and a high-temperature superconductor
John R. Hull,Ahmet Cansiz +1 more
TL;DR: In this paper, the vertical and horizontal forces and associated stiffnesses on a permanent magnet (PM) above a high-temperature superconductor (HTS) were measured during vertical traverses in zero-field cooling (ZFC) and in field cooling (FC).