ac losses in a YBa2Cu3O7−x coil

Polák, M.; Demenčík, E.; Janšák, L.; Mozola, P.; Aized, D.; Thieme, C.L.H.; Levin, Gilbert V.; Barnes, Paul N.

doi:10.1063/1.2207837

Cited by 25 publications

(23 citation statements)

References 13 publications

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“…As a consequence, the measured signals were practically sinusoidal, different from the triangular signals reported by Polak et al for a coil with a small radius [11]. Actually, for an accurate analysis of the voltage signal it is necessary to appropriately remove the inductive signal.…”

Section: A Voltage Signalmentioning

confidence: 78%

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AC Loss and Voltage Signal in a Pancake Coil Made of Coated Conductor With Ferromagnetic Substrate

Pardo

Šouc

Vojenčiak

et al. 2009

IEEE Trans. Appl. Supercond.

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The voltage signal and the AC loss in a pancake coil made of a coated conductor tape with magnetic substrate is measured. The experimental data have been analyzed with the help of numerical calculations. It is found that while for a single tape the AC loss is dominated by the substrate, for the coil it is dominated by the superconducting layer. Moreover, the substrate increases the AC loss generated in the superconducting material, making it similar to a slab. A compensation method for the voltage signal is also described, thanks to which the contribution from the substrate and the superconducting layer can be distinguished.

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Section: A Voltage Signalmentioning

confidence: 78%

“…A remarkable experimental work has been published by Polak. et al [11]. However, in that article there are several questions left open, like the contribution of the AC loss from the ferromagnetic material and the anomalous shape of the voltage signal.…”

Section: Introductionmentioning

confidence: 95%

AC Loss and Voltage Signal in a Pancake Coil Made of Coated Conductor With Ferromagnetic Substrate

Pardo

Šouc

Vojenčiak

et al. 2009

IEEE Trans. Appl. Supercond.

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“…In addition, measurements must be made on long conductors and windings and must be made at higher field sweep rates, or higher magnetic fields and frequencies. Some initial measurements have been made on small coils, but where the ac current is applied as opposed to being induced by an alternating magnetic field 27 . In this case, the properties were measured of a small pancake coil made with a 10 mm wide copper‐stabilized YBCO‐coated conductor.…”

Section: Ybco Conductor Developmentmentioning

confidence: 99%

“…Some initial measurements have been made on small coils, but where the ac current is applied as opposed to being induced by an alternating magnetic field. 27 In this case, the properties were measured of a small pancake coil made with a 10 mm wide copperstabilized YBCO-coated conductor. When the radial component of the magnetic field was mapped at the coil edge, it differed from that determined from a uniform current distribution.…”

Section: Ac Lossmentioning

confidence: 99%

Advancing YBCO‐Coated Conductors for Use on Air Platforms

Barnes

2007

Int J Applied Ceramic Tech

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With progress of the YBCO‐coated conductor to longer lengths, application of the conductor is nearing. An overview of a couple of current U.S. Air Force application programs is presented. A discussion is then made of where research and development of the YBCO‐coated conductor should progress and examples in the U.S. Air Force program. These areas include magnetic flux pinning in YBCO thin films, reduction of the ac losses experienced in the YBCO conductor, and stability and quench issues when implementing the YBCO‐coated conductor.

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“…Besides improving the single RACC cable current performance, we are also focusing on other equally important aspects: extending the cable length, reducing the AC losses, and assembling coils for possible applications. Pancake coils from coated conductors have been A. Kario, F. Grilli studied by several groups [5][6][7][8][9], but until now only one pancake coil with Roebel cable was successfully made by Jiang et al [10]. That coil was made from a 5 m-long Roebel cable with 9 strands, each 2 mm wide, with a 5.44 mm distance between the turns.…”

Section: Introductionmentioning

confidence: 99%

DC and AC Characterization of Pancake Coils Made From Roebel-Assembled Coated Conductor Cable

Kario¹,

Vojenčiak²,

Grilli³

et al. 2015

IEEE Trans. Appl. Supercond.

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Abstract-Roebel cables made of HTS coated conductors cancarry high currents with a compact design and reduced AC losses. They are therefore good candidates for manufacturing coils for HTS applications such as motors and generators. In this paper we present the experimental DC and AC characterization of several coils assembled from a 5 meter long Roebel cable built at KIT, which differ in the number of turns and turn-to-turn spacing. Our experiments, supported by finiteelement method (FEM) calculations, show that a more tightly wound Roebel coil, despite having a lower critical (and therefore operating) current, can produce a higher magnetic field than a loosely wound one. For a given magnetic field produced at the coil's center, all the coils have similar AC losses, with the exception of the most loosely wound one, which has much higher losses due to the relatively large current needed to produce the desired field. The experiments presented in this paper are carried out on the geometry of pancake coils made of Roebel cables, but they are exemplary of a more general strategy that, coupling experiments and numerical simulations, can be used to optimize the coil design with respect to different parameters, such as tape quantity, size, or AC loss -the relative importance of which is dictated by the specific application.

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ac losses in a YBa2Cu3O7−x coil

Cited by 25 publications

References 13 publications

AC Loss and Voltage Signal in a Pancake Coil Made of Coated Conductor With Ferromagnetic Substrate

AC Loss and Voltage Signal in a Pancake Coil Made of Coated Conductor With Ferromagnetic Substrate

Advancing YBCO‐Coated Conductors for Use on Air Platforms

DC and AC Characterization of Pancake Coils Made From Roebel-Assembled Coated Conductor Cable

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