High temperature superconducting multilayer multichip module: fabrication and high speed characterization

1999 ◽  
Vol 9 (2) ◽  
pp. 4099-4102
Author(s):  
P.R. Anderson ◽  
A.W. Lindner ◽  
P.M. Chau ◽  
A.D. Smith
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Multichip Module ◽  
High Temperature Superconducting

Analysis of the Permanent Magnet Guideway of High Temperature Superconducting Maglev

2013 ◽  
Vol 745-746 ◽  
pp. 197-202 ◽  
Author(s):  
Chang Qing Ye ◽  
Zi Gang Deng ◽  
Jia Su Wang
Keyword(s):  
High Temperature ◽  
Permanent Magnet ◽  
High Speed ◽  
Optimization Design ◽  
Optimization Methods ◽  
High Temperature Superconducting ◽  
Practical Engineering ◽  
Hts Maglev ◽  
Ndfeb Permanent Magnet ◽  
The Cost

t was theoretically and experimentally proved that High Temperature Superconducting (HTS) Maglev had huge potential employment in rail transportation and high speed launch system. This had attracted great research interests in practical engineering. The optimization design was one of the most important works in the application of the HTS Maglev. As the NdFeB permanent magnet and HTS materials prices increased constantly, the design optimization of the permanent guideway (PMG) of HTS maglev became one of the indispensable works to decrease the cost of the application. This paper first reviewed four types of PMGs used by the HTS Maglev, then disucssed their structures and magnetic fields. Finally, the optimization methods of these four PMGs were compared. It was suggested that with better optimization methods, the levitation performance within a limit cost got better. That would be helpful to the future numerical optimization of the PMG of the HTS maglev.

scholarly journals High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1980
Author(s):  
Li Lu ◽  
Wei Wu ◽  
Xin Yu ◽  
Zhijian Jin
Keyword(s):  
High Temperature ◽  
Liquid Helium ◽  
High Speed ◽  
Closed Loop ◽  
Permanent Magnets ◽  
Superconducting Magnets ◽  
Current Mode ◽  
Persistent Current ◽  
Magnetomotive Force ◽  
High Temperature Superconducting

The null-flux electro-dynamic suspension (EDS) system is a feasible high-speed maglev system with speeds of above 600 km/h. Owing to their greater current-carrying capacity, superconducting magnets can provide a super-magnetomotive force that is required for the null-flux EDS system, which cannot be provided by electromagnets and permanent magnets. Relatively mature high-speed maglev technology currently exists using low-temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T ⩽ 4.2 K). Second-generation (2G) high-temperature superconducting (HTS) magnets wound by REBa2Cu3O7−δ (REBCO, RE = rare earth) tapes work above the 20 K region and do not rely on liquid helium, which is rare on Earth. In this study, the HTS non-insulation closed-loop coils module was designed for an EDS system and excited with a persistent current switch (PCS). The HTS coils module can work in the persistent current mode and exhibit premier thermal quenching self-protection. In addition, a full-size double-pancake (DP) module was designed and manufactured in this study, and it was tested in a liquid nitrogen (LN2) environment. The critical current of the DP module was approximately 54 A, and it could work in the persistent current mode with an average decay rate measured over 12 h of 0.58%/day.

Development of a Superconducting Transformer for Rolling Stock

2006 ◽  
Vol 47 ◽  
pp. 204-211
Author(s):  
Hiroyuki Fujimoto ◽  
Hiroshi Hata ◽  
Hiroki Kamijo ◽  
Ken Nagashima ◽  
Kazuya Ikeda ◽  
...  
Keyword(s):  
High Temperature ◽  
Liquid Nitrogen ◽  
High Speed ◽  
Rolling Stock ◽  
Maximum Output ◽  
Superconducting Wire ◽  
High Temperature Superconducting ◽  
Highly Efficient ◽  
Liquid Nitrogen Cooling

Having undertaken studies into a lightweight and highly efficient superconducting transformer for rolling stock, we developed a prototype with a primary winding, four secondary windings and a tertiary winding using Bi-2223 high temperature superconducting wire. Its primary voltage is 25kV, which is widely adopted as the catenary voltage on the world's high-speed lines. We adopted liquid nitrogen cooling, the weight being 1.71t excluding the refrigerator. The maximum output available to maintain superconductivity is 3.5MVA. We also introduce railways in Japan.

scholarly journals High Temperature Superconducting Non-insulation Closed-loop Coils for Electro-dynamic Suspension System

2021 ◽  
Author(s):  
Li Lu ◽  
Wei Wu ◽  
Xin Yu ◽  
Zhijian Jin
Keyword(s):  
High Temperature ◽  
Liquid Helium ◽  
High Speed ◽  
Closed Loop ◽  
Permanent Magnets ◽  
Current Model ◽  
Persistent Current ◽  
Magnetomotive Force ◽  
High Temperature Superconducting ◽  
Double Pancake

Null-flux Electro-dynamic suspension (EDS) system promises to be one of the feasible high-speed maglev systems above 600 km/h. On account of its greater current-carrying capacity, superconducting magnet can provide super-magnetomotive force that is required for null-flux EDS system and cannot be provided by electromagnets and permanent magnets. There is already a relatively mature high-speed maglev technology with low temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T≤4.2 K). 2-Generation high temperature superconducting (HTS) magnet winded by REBa2Cu3O7−δ (REBCO, RE=rare earth) tapes works above 20 K region and do not need to count on liquid helium which is rare on earth. This paper designed HTS no-insulation closed-loop coils applied for EDS system and energized with persistent current switch. The coils can work at persistent current model and has premier thermal quench self-protection. Besides, a full size double-pancake module was designed and manufactured in this paper, and it was tested in liquid nitrogen. The double-pancake module’s critical current is about 54 A and it is capable of working at persistent current model, whose average decay rate measured in 12 hours is 0.58%/day.

A SUPERHIGH SPEED HTS MAGLEV VEHICLE

2005 ◽  
Vol 19 (01n03) ◽  
pp. 399-401 ◽  
Author(s):  
JIASU WANG ◽  
SUYU WANG ◽  
CHANGYAN DENG ◽  
YOUWEN ZENG ◽  
HONGHAI SONG ◽  
...  
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Aerodynamic Resistance ◽  
Pressure Tube ◽  
Speed Limit ◽  
High Temperature Superconducting ◽  
Maglev Vehicle ◽  
Hts Maglev ◽  
Evacuated Tube Transport ◽  
Evacuated Tube

When the velocity of the normal ground traffic transportation is higher than 350 km/h of the speed limit, not only the running noise of the ground traffic vehicle is higher, but also the 90% driving power is dissipated in the aerodynamic resistance. The high speed may be realized when a high temperature superconducting (HTS) Maglev vehicle runs in low-pressure tube or evacuated tube transport (ETT). Its speed is over 3000 km/h. As a new ground transportation system the HTS Maglev vehicle is presented after the experiment results of HTS Maglev vehicle are discussed in this paper.

scholarly journals Design and Test of a High-Speed Double-Winding High Temperature Superconducting Synchronous Motor

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 77470-77481
Author(s):  
Cao Jiwei ◽  
Han Zhengnan ◽  
Song Yuchen ◽  
Li Liyi
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Synchronous Motor ◽  
High Temperature Superconducting
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