Modeling of AC Loss in Coils Made of Thin Tapes Under DC Bias Current

Pardo, Enric

doi:10.1109/tasc.2013.2282495

Cited by 18 publications

(17 citation statements)

References 30 publications

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“…ynamic resistance occurs when a superconducting wire carries DC transport current whilst experiencing an alternating magnetic field [1,2]. In HTS applications such as rotating machines, magnets, and SMES (Superconducting Energy Storage Systems), dynamic resistance plays an important role [3][4][5][6]. In HTS flux pumps, dynamic resistance within the HTS stator determines the maximum available output current [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Dynamic resistance measurements in a GdBCO-coated conductor

Jiang¹,

Toyomoto²,

Amemiya³

et al. 2021

Preprint

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Dynamic resistance is a phenomenon which occurs when a superconducting wire carries dc transport current whilst experiencing an alternating magnetic field. This situation occurs in a range of HTS machinery applications, where dynamic resistance can lead to large parasitic heat loads and potential quench events. Here, we present dynamic resistance measurements of a 5-mm-wide Fujikura coated conductor wire at 77 K. We report experimental values obtain through varying the field angle (the angle between magnetic field and normal vector of the conductor wide-face), the dc current levels, and the magnetic field amplitude, and frequency. We show that the dynamic resistance in perpendicular magnetic field can be predicted by using a simple analytical equation. We also show that across the range of field angles measured here the dynamic resistance is dominated by the perpendicular component of the applied magnetic field. © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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Section: Introductionmentioning

confidence: 99%

Dynamic resistance measurements in a GdBCO-coated conductor

Jiang¹,

Toyomoto²,

Amemiya³

et al. 2021

Preprint

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“…Dynamic resistance measurement in stacks carrying dc current super-imposed with ac current will be our next target [3].…”

Section: Resultsmentioning

confidence: 99%

Dynamic Resistance Measurement of a Four-Tape YBCO Stack in a Perpendicular Magnetic Field

Jiang¹,

Zhou²,

Bumby³

et al. 2021

Preprint

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Dynamic resistance occurs when HTS (high-temperature superconductor) coated conductors carry dc current under ac magnetic field. This dissipative effect can play a critical role in many HTS applications. Here, we report on dynamic resistance measurements of a four-tape YBCO stack comprising 4-mm-wide coated conductors, which experience an applied ac perpendicular magnetic field with an amplitude of up to 100 mT. Each tape within the stack carries the same dc current. The magnetic field amplitude, the frequency of the magnetic field, and the dc current magnitude are varied to investigate the influence of these parameters on the dynamic resistance. We find that the threshold field of the stack is significantly larger than that of a single tape when dc current is small, which we attribute to coherent shielding effects from circulating currents present in each wire in the stack. © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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“…The numerical model was developed using the T formulation, which is based upon the current vector potential, T [24][25][26]. Unlike the modelling of bulk superconductors [27][28][29] The thin-strip approximation of the superconducting layer has been applied, since the HTS coated conductor comprises a thin film (typically ~1µm) of superconducting material, which results in a very high aspect ratio (w/t s ) in an order of 10 3 and the thickness can be neglected [30][31][32][33][34]. The governing equation of the electromagnetic field in a coated conductor is derived from Faraday's law as:…”

Section: Numerical Modellingmentioning

confidence: 99%

Numerical Modeling of Dynamic Loss in HTS-Coated Conductors Under Perpendicular Magnetic Fields

Li¹,

Yao²,

Jiang³

et al. 2021

Preprint

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© 2017 IEEE. High-Tc superconducting (HTS)-coated conductors are a promising option for the next-generation power devices. However, their thin-film geometry incurs dynamic loss when exposed to a perpendicular external ac magnetic field, which is difficult to predicate and estimate. In this paper, we propose and verify a numerical simulation model to predict the dynamic loss in HTS-thin-coated conductors by taking into account their Jc-B dependence and I-V characteristics. The model has been tested on a SuperPower YBCO-coated conductor, and we observed a linear increase of dynamic loss along the increasing field amplitude after the threshold field. Our simulation results agree closely with experimental measurements as well as an analytical model. Furthermore, the model can predict the nonlinear increase of dynamic loss at high current, while the analytical model deviates from the measurement results and still shows a linear correlation between the dynamic loss and the external magnetic field. In addition, we have used this model to simulate the distributions of magnetic field and current density when dynamic loss occurs. Results clearly show the flux traversing the coated conductor, which causes dynamic loss. These distributions have also been used to analyze the change of dynamic loss when either the transport current or the magnetic field increase individually, while the other factor remains constant. The simulation analysis on dynamic loss is done for the first time in this paper, and our results clearly demonstrate how dynamic loss changes as well as its dependence on transport current and magnetic field. © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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Modeling of AC Loss in Coils Made of Thin Tapes Under DC Bias Current

Cited by 18 publications

References 30 publications

Dynamic resistance measurements in a GdBCO-coated conductor

Dynamic resistance measurements in a GdBCO-coated conductor

Dynamic Resistance Measurement of a Four-Tape YBCO Stack in a Perpendicular Magnetic Field

Numerical Modeling of Dynamic Loss in HTS-Coated Conductors Under Perpendicular Magnetic Fields

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