Experimental and numerical studies of the effect of phase difference between transport current and perpendicular applied magnetic field on total ac loss in Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox tape

Nguyen, Doan N.; Pamidi, Sastry; Knoll, D.C.; Zhang, Guomin; Schwartz, J.

doi:10.1063/1.2064314

Cited by 14 publications

(10 citation statements)

References 12 publications

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“…Latter facts agree with the analytical approaches for the slab 60 and strip 61 geometries. Also, in further agreement with the experimental evidences, [43][44][45] within our statement we predict that as long as a phase shifting occurs, at least a minimal reduction of the ac loss should be observed.…”

Section: -12supporting

confidence: 91%

“…Moreover, remarkable experimental differences between the ac loss measured for superconducting wires or tapes with synchronous and asynchronous oscillating transport current and perpendicular magnetic field have been already reported by several authors. [43][44][45] In what follows we will address the effects related to the consideration of asynchronous excitations, in which, both sources may be out of phase and apply at different frequencies. However, given the enormous number of possibilities to analyze, we will focus on the influence of double frequency effects over the actual estimation of the ac losses in a superconducting wire, when any of the electromagnetic sources is plugged to some power grid with a double frequency than the other.…”

Section: Asynchronous Excitationsmentioning

confidence: 99%

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Exotic magnetic response of superconducting wires subject to synchronous and asynchronous oscillating excitations

Badía-Majós

2013

Journal of Applied Physics

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The time-dependent local electromagnetic properties of a type-II superconducting wire subject to the concomitant action of an ac transport current and an oscillating transverse magnetic field in synchronous and asynchronous regimes are thoroughly studied under the critical state approach. Relative double frequency effects between the electromagnetic excitations have been explored for the asynchronous cases. Outstandingly, the occurrence of this event can drastically alter the efficiency of the superconducting wire by increasing the ac losses, contrary to the prediction of a reduction in the ac losses when a relative phase shifting is considered. Likewise, striking magnetization loops and remarkable differences to the ac losses predicted by simplified analytical approaches are reported. For cyclic regime, the time-dependent distribution of local current density, the density of power dissipation, and the components of the magnetic flux density are shown in a wide number of cases. Multiply connected domains are revealed for the flux front profiles via the time-dependent consumption of the magnetization currents by effect of the injected transport current lines. Finally, we have shown that the strong localization of the power density and the recently envisaged low pass filtering effect in the wire's magnetic response is only affordable when both electromagnetic excitations evolve synchronous. V C 2013 AIP Publishing LLC. [http://dx.

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Section: -12supporting

confidence: 91%

Section: Asynchronous Excitationsmentioning

confidence: 99%

Exotic magnetic response of superconducting wires subject to synchronous and asynchronous oscillating excitations

Badía-Majós

2013

Journal of Applied Physics

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“…These calculations predict that the ac loss maximum is when the alternating current and field are in phase with each other. However, simulations for slabs [139] and elliptical wires [140], [75] show that for large applied fields, the ac loss maximum is at intermediate phase shifts for both a powerlaw E(J) relation and the critical-state model. Experiments confirm this [140], [75].…”

Section: Solutions For Particular Casesmentioning

confidence: 96%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

312

272

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Numerical modeling of superconductors is widely recognized as a powerful tool for interpreting experimental results, understanding physical mechanisms and predicting the performance of high-temperature superconductor (HTS) tapes, wires and devices. This is especially true for ac loss calculation, since a sufficiently low ac loss value is imperative to make these materials attractive for commercialization. In recent years, a large variety of numerical models, based on different techniques and implementations, have been proposed by researchers around the world, with the purpose of being able to estimate ac losses in HTSs quickly and accurately. This article presents a literature review of the methods for computing ac losses in HTS tapes, wires and devices. Technical superconductors have a relatively complex geometry (filaments, which might be twisted or transposed, or layers) and consist of different materials. As a result, different loss contributions exist. In this paper, we describe the ways of computing such loss contributions, which include hysteresis losses, eddy current losses, coupling losses, and losses in ferromagnetic materials. We also provide an estimation of the losses occurring in a variety of power applications.

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“…Previous studies based on HTS tapes showed that total AC loss of HTS tapes increased when transport current or external magnetic field was increased [25,26], and it is influenced by the phase shift between the current and the external magnetic field [14,[15][16][17][18][19]. These result indicated that the total AC loss of machine AC windings depends not only on the magnitudes of the magnetic field and transport current, but also on the interaction between the magnetic field and the current.…”

Section: Introductionmentioning

confidence: 92%

Total AC loss study of 2G HTS coils for fully HTS machine applications

Zhang

Yuan

Kvitkovič

et al. 2015

Supercond. Sci. Technol.

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The application of HTS coils for fully HTS machines has become a new research focus. In the stator of an electrical machine, HTS coils are subjected to a combination of an AC applied current and AC external magnetic field. There is a phase shift between the AC current and AC magnetic field. In order to understand and estimate the total AC loss of HTS coils for electrical machines, we designed and performed a calorimetric measurement for a 2G HTS racetrack coil. Our measurement indicates that the total AC loss is greatly influenced by the phase shift between the applied current and the external magnetic field when the magnetic field is perpendicular to the tape surface. When the applied current and the external magnetic field are in phase, the total AC loss is the highest. When there is a 90 degree phase difference, the total AC loss is the lowest. In order to explain this phenomenon, we employ H formulation and finite element method to model the 2G HTS racetrack coil. Our calculation agrees well with experimental measurements. Two parameters are defined to describe the modulation of the total AC loss in terms of phase difference. The calculation further reveals that the influence of phase difference varies with magnetic field direction. The greatest influence of phase difference is in the perpendicular direction. The study provides key information for large-scale 2G HTS applications, e.g. fully HTS machines and superconducting magnetic energy storage, where the total AC loss subjected to both applied currents and external magnetic fields is a critical parameter for the design.

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Experimental and numerical studies of the effect of phase difference between transport current and perpendicular applied magnetic field on total ac loss in Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox tape

Cited by 14 publications

References 12 publications

Exotic magnetic response of superconducting wires subject to synchronous and asynchronous oscillating excitations

Exotic magnetic response of superconducting wires subject to synchronous and asynchronous oscillating excitations

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Total AC loss study of 2G HTS coils for fully HTS machine applications

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