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

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.

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

Electronics ◽

10.3390/electronics10161980 ◽

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.

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Analysis of the Permanent Magnet Guideway of High Temperature Superconducting Maglev

Materials Science Forum ◽

10.4028/www.scientific.net/msf.745-746.197 ◽

2013 ◽

Vol 745-746 ◽

pp. 197-202 ◽

Cited By ~ 2

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.

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High Speed, High Temperature, Fault Tolerant Operation of a Combination Magnetic-Hydrostatic Bearing Rotor Support System for Turbomachinery

Volume 6: Turbo Expo 2004 ◽

10.1115/gt2004-53321 ◽

2004 ◽

Cited By ~ 3

Author(s):

Mark Jansen ◽

Gerald Montague ◽

Andrew Provenza ◽

Alan Palazzolo

Keyword(s):

High Temperature ◽

High Speed ◽

Closed Loop ◽

Fault Tolerant ◽

Active Vibration Control ◽

Control Algorithms ◽

Displacement Sensors ◽

Rotor Support ◽

Active Vibration ◽

Speed Computer

Closed loop operation of a single, high temperature magnetic radial bearing to 30,000 RPM (2.25 million DN) and 540°C (1,000°F) is discussed. Also, high temperature, fault tolerant operation for the three axis system is examined. A novel, hydrostatic backup bearing system was employed to attain high speed, high temperature, lubrication free support of the entire rotor system. The hydrostatic bearings were made of a high lubricity material and acted as journal-type backup bearings. New, high temperature displacement sensors were successfully employed to monitor shaft position throughout the entire temperature range and are described in this paper. Control of the system was accomplished through a stand alone, high speed computer controller and it was used to run both the fault-tolerant PID and active vibration control algorithms.

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Development of a Superconducting Transformer for Rolling Stock

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.47.204 ◽

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.

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High-speed bit-error-rate measurement system for high-temperature superconducting digital circuits

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2003.820509 ◽

2003 ◽

Vol 13 (4) ◽

pp. 3833-3838 ◽

Cited By ~ 2

Author(s):

M. Horibe ◽

Y. Tarutani ◽

K. Tanabe

Keyword(s):

High Temperature ◽

Measurement System ◽

Bit Error Rate ◽

Error Rate ◽

High Speed ◽

Digital Circuits ◽

Rate Measurement ◽

High Temperature Superconducting

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Study Status of Giant Magnetostrictive Material Applied in Measurement Field

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.716-717.98 ◽

2014 ◽

Vol 716-717 ◽

pp. 98-101

Author(s):

Hui Fang Liu ◽

Jian Chun Zhang ◽

Ke Ran Li ◽

Ye Li

Keyword(s):

Rare Earth ◽

High Temperature ◽

Permanent Magnets ◽

Hot Spot ◽

Luminescent Material ◽

Functional Material ◽

Magnetostrictive Material ◽

High Temperature Superconducting ◽

Giant Magnetostrictive Material ◽

New Type

Giant Magnetostrictive material is a new type of rare earth functional material which is after the rare earth permanent magnets, rare earth luminescent material and rare earth high temperature superconducting material. At present, giant magnetostrictive material has become a domestic research hot spot, and made great achievements. In this paper, research and application status on giant magnetostrictive material has been summarized. It mainly includes two aspects: giant magnetostrictive sensors and self-sensing actuator.

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