Engineering-based design and fabrication procedure for mid-temperature REBCO magnets accommodating the strong Ic anisotropy

Zhang, Zili; Zhou, Benzhe; Liu, Jianhua; Wang, Lei; Wang, Qiuliang

doi:10.1016/j.supcon.2022.100005

Cited by 16 publications

(8 citation statements)

References 29 publications

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“…High-temperature superconductor (HTS) (RE)Ba 2 Cu 3 O x (ReBCO) machines have superior power density, which is a promising candidate for motors/generators of electrical aircraft. However, quench protection has always been a concern for HTS machines due to the low quench propagation velocity of ReBCO tapes [4][5][6][7][8]. The no-insulation (NI) coil shows a great advantage on enhanced thermal stability since the transport current can bypass the normal zone during a local quench [9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba₂Cu₃O _x coil under AC axial background magnetic fields

Xue¹,

Fu²,

Lu³

et al. 2022

Supercond. Sci. Technol.

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No-insulation (NI) high temperature superconductor (HTS) coil shows a great advantage on enhanced thermal stability during quenches. It is inevitably exposed to ripple AC magnetic fields in some applications, such as synchronous machines, tokamak magnets and maglev trains. The AC applied fields can induce an eddy current in NI coils due to the absence of turn-to-turn insulation. This eddy current may cause considerable maximum DC operating current degradation and additional magnetization loss in NI coils, which are still unclear. This paper is to study this issue by both experiments and simulations. An experimental platform is built to measure the maximum operating current of HTS coils exposed to AC axial applied fields, and the results show that the axial AC applied fields can lead to a significant maximum operating current degradation (22.9 % in this study) on the NI HTS coil due to the eddy current induced even though the field is parallel to tape’s ab-plane and has a very low amplitude and frequency (26.88 mT/50 Hz). Meanwhile, this low applied field has little effect on the critical current of insulated HTS coils. A numerical model is applied to elucidate the underlying physical mechanism of this phenomenon, and the magnetization loss induced by additional transport current is analyzed using this model. The influence of grading turn-to-turn resistivity technique is also investigated, and the results show that this technique can effectively prevent the maximum operating current degradation and reduce the magnetization loss of NI HTS coils exposed to AC axial applied fields.

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Section: Introductionmentioning

confidence: 99%

Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba₂Cu₃O _x coil under AC axial background magnetic fields

Xue¹,

Fu²,

Lu³

et al. 2022

Supercond. Sci. Technol.

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“…Secondly, the complex current distribution leads to a loss of symmetry in the study problem [18]. Experiments indicates that it is not accurate to estimate the electromangetic response of superconductingwires by only considering parallel component or perpendicular component of oblique magnetic field [19,20]. Similar findings can be found in [21][22][23][24].…”

Section: Introductionmentioning

confidence: 76%

Fast time-varying current triggering flux jumps of multi-filamentary Nb₃Sn wire exposed to oblique magnetic field

Li¹,

Xue²

2023

Phys. Scr.

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Due to the oblique magnetic field and rapid time-varying current, the electromagnetic response and thermomagnetic instabilities of high-field superconducting dipole magnets are quite different from the solenoid coils. In this work, we theoretically investigate the flux jump of composite multi-filamentary Nb3Sn wire with high critical current density exposed to an oblique magnetic field and fast transport current. The thermomagnetic stability/instability regions are obtained with respect to flux creep factor and oblique ratios of magnetic field. It is found that the parallel component of the oblique magnetic field can suppress the flux jump. Unlike slow current, it is interesting to find that the fast variations of self-field by high ramp current can trigger flux jumps in Nb3Sn wire. The fast current triggering flux jumps can be tuned by the static oblique magnetic field. Furthermore, we demonstrate that current-like distribution is more likely to trigger quenches, while the magnetic field-like distribution is more likely to trigger flux jumps. The findings of this work are helpful for the optimization of the superconducting coils exposed to oblique magnetic field and fast time-varying current.

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“…Superconducting materials have high potential and irreplaceable applications in power transmission, energy storage, fusion energy control, and other scenarios, owing to their unique physical properties [1,2]. The commercialization of high temperature superconducting (HTS) REBa 2 Ca 3 O 7−x tapes provides a feasible foundation for the development of superconducting power applications [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A prediction method for the screening current induced field in HTS magnets based on time series models

Wang

Meng

Cai

et al. 2023

Supercond. Sci. Technol.

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Due to the special electromagnetic properties, high temperature superconducting (HTS) conductors become the potential solution for ultra-high field magnet and energy storage applications. However, screening current induced field (SCIF) have been demonstrated to be the main limitation to high field HTS magnets in actual applications. Based on time series models, this paper presents a prediction method of SCIF to support the design and application of HTS magnets. First, we analyze the data characteristic of SCIF hysteresis loop. The simulated dataset is prepared for two typical magnet structures: single pancake and solenoid. Then, time series models are proposed for the SCIF prediction. Through the intuitive analysis and the evaluation metrics, the training performance of time series models is confirmed. After discussion on hyper-parameters and dimension reduction, the optimized prediction performance is obtained for the SCIF hysteresis loop. In conjunction with the iterative prediction mode, it finally achieves the feasible and effective prediction method of SCIF for HTS magnets. It will provide a tool and research strategy to support the general finite element method.

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Engineering-based design and fabrication procedure for mid-temperature REBCO magnets accommodating the strong Ic anisotropy

Cited by 16 publications

References 29 publications

Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba₂Cu₃O _x coil under AC axial background magnetic fields

Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba₂Cu₃O _x coil under AC axial background magnetic fields

Fast time-varying current triggering flux jumps of multi-filamentary Nb₃Sn wire exposed to oblique magnetic field

A prediction method for the screening current induced field in HTS magnets based on time series models

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Engineering-based design and fabrication procedure for mid-temperature REBCO magnets accommodating the strong Ic anisotropy

Cited by 16 publications

References 29 publications

Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba2Cu3O x coil under AC axial background magnetic fields

Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba2Cu3O x coil under AC axial background magnetic fields

Fast time-varying current triggering flux jumps of multi-filamentary Nb3Sn wire exposed to oblique magnetic field

A prediction method for the screening current induced field in HTS magnets based on time series models

Contact Info

Product

Resources

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Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba₂Cu₃O _x coil under AC axial background magnetic fields

Maximum DC operating current degradation and magnetization loss of no-insulation (RE)Ba₂Cu₃O _x coil under AC axial background magnetic fields

Fast time-varying current triggering flux jumps of multi-filamentary Nb₃Sn wire exposed to oblique magnetic field