Decay of Trapped Magnetic Field in Stacks of YBCO Coated Conductors Subjected to Traveling Magnetic Waves

Li, Xiang; Li, Jing; Zhou, Pengbo; Liu, Kun; Han, Le; Song, Xuliang; Ma, Guangtong

doi:10.1109/tasc.2019.2914053

Cited by 8 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although uncoupled stacks (and coils) and fully coupled stacks have been well studied by many researchers before, the case of an intermediate finite resistance ('partial coupling') has not been previously studied for stacks of tapes. Previous studies focused on AC loss under perpendicular magnetic field [20][21][22][23][24][25][26][27][28], AC loss under transport current [29][30][31][32][33], ac loss with consideration of ferromagnetic material [34][35][36][37], dynamic resistance under time-varying applied field [38][39][40][41], magnetization and decay of trapped magnetic field [42][43][44][45][46][47][48][49], multifilamentary calculations [20,50], among other topics.…”

Section: Introductionmentioning

confidence: 99%

Coupling loss at the end connections of REBCO stacks: 2D modelling and measurement

Kováč

Pardo

2020

Supercond. Sci. Technol.

View full text Add to dashboard Cite

In high power density superconducting motors, superconducting tapes are usually stacked and connected together at terminals to improve the current capacity. When a parallel sinusoidal magnetic field is applied on this partially coupled stack, the coupling current is induced and causes additional coupling loss. Usually 3D modeling is needed to calculate the coupling loss but it takes too much computing resource and time. In this paper, a numerical 2D modeling by minimum electromagnetic entropy production (MEMEP) method is developed to speed up the calculation. The presented MEMEP model shows good accuracy and the capability to take the realistic resistance between tapes into account for coupling loss calculation with a high number of mesh element, which agrees to measurements.Thanks to the model, a systemic study of coupling loss on amplitude-dependence, frequency-dependence, resistance-dependence, and length-dependence, is presented and discussed. The results reveal the features of coupling loss which is very helpful devices with multi-tape conductors, such as the stator or rotor windings of motors.

show abstract

Section: Introductionmentioning

confidence: 99%

Coupling loss at the end connections of REBCO stacks: 2D modelling and measurement

Kováč

Pardo

2020

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In 2015, the Yamanashi Maglev Test Line (YMTL) set a world record of 603 km/h for a crewed vehicle equipped with LTS closed-loop coils. In addition, 2G HTS magnets wound with REBCO tapes can operate at above 20 K. Compared with the LTS magnets, the cooling cost of the HTS magnets is considerably reduced, and liquid helium is not required, which is a non-renewable and scarce resource on Earth [10][11][12]. The HTS Open-loop magnets based on conduction cooling have been developed, but the 2G HTS closed-loop magnets are not yet practical, mainly owing to the immaturity of superconducting PCS technology, joint technology, and quenching protection.…”

Section: Introductionmentioning

confidence: 99%

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

Yu³

et al. 2021

Electronics

View full text Add to dashboard Cite

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.

show abstract

“…In 2015, the Yamanashi Maglev Test Line (YMTL) set a world record of 603 km/h for the manned vehicle equipped with LTS closedloop coils. In addition, the 2G high temperature superconducting (HTS) magnets wound with REBCO tapes can operate at temperatures above 20 K. Compared with LTS magnets, the HTS magnets cooling cost is considerably cut, and China do not need to rely on liquid helium, a non-renewable and scarce strategic resource on earth [10][11][12] . Open-loop superconducting magnets based on conduction cooling have been developed, but 2G HTS closed-loop magnets still have a long way to be practical, mainly owing to the immaturity of superconducting persistent current switch (PCS) technology, joint technology and quench protection.…”

Section: Introductionmentioning

confidence: 99%

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

Lu¹,

Wu²,

Yu³

et al. 2021

Preprint

View full text Add to dashboard Cite

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.

show abstract

Decay of Trapped Magnetic Field in Stacks of YBCO Coated Conductors Subjected to Traveling Magnetic Waves

Cited by 8 publications

References 28 publications

Coupling loss at the end connections of REBCO stacks: 2D modelling and measurement

Coupling loss at the end connections of REBCO stacks: 2D modelling and measurement

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

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

Contact Info

Product

Resources

About