Improvement of magnetic and cryogenic energy preservation performances in a feeding-power-free superconducting magnet system for maglevs

Dong, Fangliang; Huang, Zhen; Xu, Xiaoyong; Hao, Luning; Shao, Nan; Jin, Zhijian

doi:10.1016/j.energy.2019.116403

Cited by 21 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the simulation and experiment on the eddy current losses in the magnet were also conducted under the electromagnetic vibration originating from the ground coils, proving that the eddy current loss is negligible in comparison to the static heat load in this magnet [16]. More recently, a no-insulation REBCO magnet was manufactured [17] and tested [18,19] under the application conditions of EDS train. Likewise, neither mechanical nor electrical damage was found upon the no-insulation onboard magnet.…”

Section: Introductionmentioning

confidence: 87%

Design, fabrication and testing of a coated conductor magnet for electrodynamic suspension

Gong

Wang

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Coated conductor magnet, as the onboard magnet of the electrodynamic suspension (EDS) train, is deemed promising due to its relatively high operating temperature, low cooling cost, and good mechanical tolerance, making the liquid-helium-free high-temperature superconducting (HTS) EDS train possible. In order to promote the progress of the HTS EDS train, this work aims at designing, fabricating and testing a coated conductor magnet as the onboard magnet of EDS train. The HTS magnet is designed with the comprehensive considerations of the electromagnetic calculation, thermal-mechanical coupling analysis, as well as the heat load estimation. The magnet is conduction-cooled without any coolant. A radiation shield was used to reduce the heat leakage, enabling the cryogenic system to provide a better low-temperature environment for the magnet. Through a deliberate design, the magnet was fabricated, including two HTS coils and the tailored cryogenic system. Afterwards, the electromagnetic and thermal performances of this magnet were tested and analysed in detail. It was proven that the magnet can be cooled to below 15 K; besides, the magnet has been successfully charged to 240 A. Further increase in the current is possible because of the high safe margin of the critical currents for both the HTS magnet and its current lead, although a slight performance degradation was observed on two double-pancake coils inside the magnet. The present study will provide useful implications for the design and application of onboard HTS magnets in EDS train.

show abstract

Section: Introductionmentioning

confidence: 87%

Design, fabrication and testing of a coated conductor magnet for electrodynamic suspension

Gong

Wang

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Due to most of the designed operating temperatures of the on-board HTS magnet being lower than 40 K [4][5][6][7][8], compared with traditional magnets stepped magnets can improve electrical performance by 25% to 45%, which is supposed to greatly boost the suspension performance of the EDS system.…”

Section: Operating Temperaturementioning

confidence: 99%

“…This makes it possible to use HTS as an alternative to LTS for EDS trains. To verify the feasibility of the replacement, a number of HTS magnets were manufactured and tested [4][5][6][7][8]. Thanks to the relatively high operating temperature, it was confirmed that the HTS magnet is able to operate at 40 K to achieve the engineered current density of NbTi magnets at 4.2 K [9].…”

Section: Introductionmentioning

confidence: 98%

Design optimization of a stepped HTS magnet for electrodynamic suspension train

Li,

Liu,

Zhou

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

High-temperature superconducting (HTS) magnets are promising candidates for transportation and power systems, such as the electrodynamic suspension (EDS) train, ultra-high field magnet and magnetic resonance imaging, because of its large current-carrying capacity and low power loss. The critical current depending on magnetic flux density is an essential factor assessing the application performance of HTS magnet. The existing HTS magnet is wound with rectangular cross-section as usual, which results in magnetic field concentration inside winding. In this paper, we proposed a novel HTS magnet structure with stepped cross-section to alleviate the magnetic field concentration, and resultantly improve the critical current. From this point, this paper is aimed to design and optimize a stepped HTS magnet with the critical current maximized. Firstly, the structure design of the stepped HTS magnet is performed with a consideration of the application scenario of EDS train. Then, the critical current of the HTS magnet is estimated with a homogenized self-consistent model. Afterwards, an HTS magnet with stepped cross-section is optimized, fabricated and finally tested. The critical current was experimentally measured to verify the simulation results, followed by the electromagnetic investigations of the stepped HTS magnet in the EDS train.

show abstract

“…However, only static tests were carried out, and there are no dynamic performance data reported. Zheng Huang et al proposed a design method for an on-board persistent-current superconducting magnet system with cooling-free operation, especially for superconducting maglevs [20], [21]. The structural dynamics of the HTS magnets were evaluated by simulation considering electromagnetic and thermal stress [22].…”

Section: Introductionmentioning

confidence: 99%

Design, Fabrication and Test of a High- Temperature Superconducting Linear Synchronous Motor Mover Magnet Prototype for High-Speed Maglev

Zhang

Mao

2022

IEEE Access

View full text Add to dashboard Cite

High-temperature superconducting linear synchronous motors (HTS-LSMs) have many advantages, such as high thrust density, high efficiency, large electromagnetic gap, and liquid-heliumfree refrigeration, because of the high operating temperature and good mechanical tolerance of high-temperature superconductors. Therefore, HTS-LSMs have broad application prospects in the field of high-speed maglev propulsion system. To study the dynamic stability of an HTS-LSM, this work aims at designing, fabricating and testing an HTS magnet as the mover magnet of an HTS-LSM. The HTS mover magnet is a monopole HTS magnet, and it is designed according to electromagnetic, structural, and thermal properties and the measurement system. A thermal model and structural dynamics model were constructed to analyze the dynamic refrigeration performance and structural dynamics characteristics of the HTS magnet. The validation of these models was verified by experimental results. The HTS coils in the HTS mover magnet were fabricated using epoxy impregnation with primary and secondary curing processes. Static tests and dynamic tests were performed to comprehensively study the characteristics of the HTS magnet. The magnet could be cooled to below 20 K and could be excited to 246 A with a certain temperature margin. An electromagnetic simulator was designed and manufactured to realize the off-line simulation of the actual operation of the HTS-LSM. The dynamic experimental results show that the HTS magnet could withstand a vibration environment of up to 18 gRMS without quenching and structural damage. This study provides useful information for the design and application of an HTS-LSM.INDEX TERMS Maglev, high-temperature superconducting linear synchronous motor (HTS-LSM), design, fabrication, test.

show abstract

Improvement of magnetic and cryogenic energy preservation performances in a feeding-power-free superconducting magnet system for maglevs

Cited by 21 publications

References 23 publications

Design, fabrication and testing of a coated conductor magnet for electrodynamic suspension

Design, fabrication and testing of a coated conductor magnet for electrodynamic suspension

Design optimization of a stepped HTS magnet for electrodynamic suspension train

Design, Fabrication and Test of a High- Temperature Superconducting Linear Synchronous Motor Mover Magnet Prototype for High-Speed Maglev

Contact Info

Product

Resources

About