Parallel magnetic field dependence of AC losses in periodically arranged superconductors with ferromagnetic substrates

Jiang, Lu; Xue, Cun; Zhou, Youhe

doi:10.1016/j.physc.2019.1353521

Cited by 7 publications

(4 citation statements)

References 63 publications

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“…Although our model assumes constant susceptibility and sheet critical current density, qualitatively, presented results for the AC current and applied field agree well with experiments and previous simulations [13][14][15]32]. VI.…”

supporting

confidence: 86%

“…For problems with a finite magnetic permeability of a substrate and different current-voltage relations characterizing the superconductor, various two-dimensional (2d) formulations have served a basis for the finite element approximation and numerical solution [4,6,[8][9][10][11][12]. The h-formulation, employed in [6,10,13] and often realized in a commercial finite element software, can be not the optimal choice because of a very high width-to-thickness ratio of a Manuscript receipt and submission dates will be inserted here. L. Prigozhin is with Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sde Boqer Campus 84990 Israel (leonid@bgu.ac.il).…”

Section: Introductionmentioning

confidence: 99%

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Thin Shell Model of a Coated Conductor With a Ferromagnetic Substrate

Prigozhin

2023

IEEE Trans. Appl. Supercond.

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supporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Thin Shell Model of a Coated Conductor With a Ferromagnetic Substrate

Prigozhin

2023

IEEE Trans. Appl. Supercond.

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“…For clarity, the curvature and the real aspect ratio are not presented. A similar structure can be found in [68][69][70][71]. However, the thickness of the superconducting layer was artificially expanded to 7 µm, making the total thickness of both superconducting layer and substrate layer equal to the thickness of a single tape.…”

Section: Machine Model With One Superconducting Stackmentioning

confidence: 87%

Magnetisation and demagnetisation of trapped field stacks in a superconducting machine for electric aircraft

Wang,

Zhang,

Hao

et al. 2023

Supercond. Sci. Technol.

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This research presents a comprehensive and innovative approach to investigating the magnetisation and cross-field demagnetisation behaviour of high-temperature superconducting (HTS) coated conductors (CCs) in practical superconducting machines. This study introduces several novel contributions, including the operation of the machine in propulsion energy conversion mode, the exploration of harmonics interaction in a real electric machine environment involving CCs, and the extraction of these harmonics as cross-field components. A 2D electromagnetic-thermal coupled numerical model employing the finite element method (FEM) has been developed and validated against experimental data to simulate a partially superconducting machine. Upon magnetisation, the HTS stacks effectively operate as trapped field magnets (TFMs), generating rotor fields for motor operation. With a peak magnetic flux density of 462 mT of the trapped field stacks (TFSs) in the air gap, the average values of the fundamental and fifth harmonics of the tangential magnetic flux density experienced by the TFSs were observed to be 25 mT and 1.75 mT, respectively. The research has thoroughly examined the impact of cross-field demagnetisation parameters including amplitude and frequency on the demagnetisation of TFSs. Furthermore, the study has also investigated the magnetisation losses occurring in various layers of HTS tapes, encompassing the HTS layer, magnetic substrate layer, and silver stabiliser at different amplitudes and frequencies. Two tape structures, namely a semi-homogenised model and a multi-layered model, have been analysed in terms of magnetisation loss. Additionally, insights into the shielding effect and skin effect at high frequencies were obtained, offering valuable information on the performance of HTS TFSs exposed to high frequency scenarios, especially in high-speed machines for electric aircraft. The research outcomes are anticipated to provide valuable knowledge for the design and optimisation of HTS rotors employing TFSs in superconducting machines, contributing to the advancement of superconducting machine technology.

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“…The magneto-optical imaging (MOI) technique was used to visualize the magnetic flux density to obtain the real magnetic field distribution in HTS tapes, and the horizontal arrangement of HTS tapes has been studied [9,10], but the magnetic field distribution of the vertical arrangement could not be completely observed due to the limitations of MOI technique [11]. Alternatively, simulations based on the finite element method (FEM) are applied widely in superconductivity research [12][13][14][15], FEM analyses have been carried out on the current density of a single tape and the AC losses in the horizontal and vertical arrangements [16][17][18][19][20]. With only two or three tapes, these basic FEM models cannot simulate the real magnetic field and current distribution of periodically arranged HTS tapes in practice, and they also can not verify or modify the analytical models, which are often used for loss estimation.…”

Section: Introductionmentioning

confidence: 99%

Modelling analysis of periodically arranged high-temperature superconducting tapes

Jin

Zhang

Lin

et al. 2020

Physica C: Superconductivity and its Applications

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The operation of a high-temperature superconducting (HTS) device is strongly related to its electromagnetic fields and conditions. It is necessary to study the electromagnetic interaction of proximity HTS tapes integrated such as placed in the horizontal or vertical direction, which is important for the design and optimization of HTS devices. This paper presents a numerical model of periodically arranged HTS tapes using the finite element method (FEM). The numerical method has been developed to build the equivalent periodical arrangement of infinite HTS tapes and applied to simulate two basic arrangements, horizontal and vertical periodical arrangements. The magnetic field and current distributions of HTS tapes by periodical arrangements have been investigated. The effects on critical current with different arrangements have been illustrated. It is found that the Y-stack can reduce the current carrying capacity while the X-array can increase that in comparison to a single tape. The differences between the FEM results and analytical models have been analysed and also compared with the Norris model. The two mathematical models derived for AC loss prediction have shown higher accuracy than the existing analytical models. This study presents an effective method to optimize the electromagnetic fields, estimate the AC loss, and shows the phenomenon of central tapes in an HTS array, which could be potentially used in performance analysis of superconducting devices, e.g. HTS transformers.

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Parallel magnetic field dependence of AC losses in periodically arranged superconductors with ferromagnetic substrates

Cited by 7 publications

References 63 publications

Thin Shell Model of a Coated Conductor With a Ferromagnetic Substrate

Thin Shell Model of a Coated Conductor With a Ferromagnetic Substrate

Magnetisation and demagnetisation of trapped field stacks in a superconducting machine for electric aircraft

Modelling analysis of periodically arranged high-temperature superconducting tapes

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