Conceptual approach to the ultimate low AC loss YBCO Superconductor

Oberly, C. E.; Razidlo, B.; Rodrı́guez, Francisco

doi:10.1109/tasc.2005.849219

Cited by 10 publications

(10 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is important because it is reported in the literature that the hysteresis losses will be decreased by the inverse of the number of lines (1/N a ) in comparison with a completely covered substrate [15,22]. The currently reported width for patterns is going from 30 µm up to one millimeter when using lithography or etching methods [7,8,12,11,16,19,21,22,24]. With our ink-jet printing technique we can obtain a similar lateral resolution in only one processing step.…”

Section: Discussionmentioning

confidence: 81%

“…There will always be eddy current losses associated with substrate and stabilization layers, which can be reduced by maximizing the substrate resistance and by also striating the stabilization layer. These methods, and avoiding interfilamentary bridging, also reduce coupling currents; but twisting the conductor, or ideally fully transposing the filaments, is required to minimize coupling losses [10][11][12][13][14][15][16][17][18]. This filamentary superconducting structure can be accomplished through several techniques which can be divided into two main approaches: with or without material removal.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thin YBa₂Cu₃O_7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

et al. 2013

View full text Add to dashboard Cite

In this paper, we present ink-jet printing as an attractive alternative to lithography and etching methods for the development of multi-filamentary YBa 2 Cu 3 O 7-δ coated conductors. Our research is mainly focused on the study of the influence of rheological parameters on the printability of water-based inks in order to produce superconducting patterns on SrTiO 3 and CeO 2 -La 2 Zr 2 O 7 -Ni5at%W substrates. An aqueous YBCO precursor ink with a total metal ion concentration of 1.1 mol/L with a viscosity of 6.79 mPa s and a surface tension of 67.9 mN/m is developed. Its printing behavior using several ink-jet printing devices is verified using a camera with strobed illumination to quantify droplet velocity and volume. After optimization of the deposition parameters, YBCO tracks with different dimensions could be printed on both types of substrates. Their shape and dimensions were determined using optical microscopy and noncontact profilometry, showing 100-200 nm thick and 40-200 µm wide tracks. Finally, resistivity measurements were performed on the widest tracks on SrTiO 3 showing a clear drop in the resistivity starting from 88.6 K with a ∆T c of 1.4 K.

show abstract

Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Thin YBa₂Cu₃O_7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Another method to reduce the AC loss of HTS CCs is to change their physical arrangements, e.g., the Roebel concept [217][218][219], Rutherford cable [220,221], and Conductor on Round Core (CORC ® ) wire [222][223][224]. The Roebel cable concept was proposed by Ludwig Roebel in 1914 to produce a low-loss copper cable [224].…”

Section: Roebel Rutherford-type and Corc ® Cablesmentioning

confidence: 99%

“…To minimize the high-frequency coupling loss, the Rutherford cable structure has been proposed by Wilson, which does not require complex twist geometries [220]. It has been demonstrated that the Rutherford configuration is a promising candidate to realize the ultimate low AC loss [221]. The conventional Rutherford-type cabling technique is suitable for round strands of superconductors [226], e.g., BSCCO-2212 and NbTi wires, as shown in Figure 16b.…”

Section: Roebel Rutherford-type and Corc ® Cablesmentioning

confidence: 99%

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

View full text Add to dashboard Cite

Superconductor technology has recently attracted increasing attention in power-generation- and electrical-propulsion-related domains, as it provides a solution to the limited power density seen by the core component, electrical machines. Superconducting machines, characterized by both high power density and high efficiency, can effectively reduce the size and mass compared to conventional machine designs. This opens the way to large-scale purely electrical applications, e.g., all-electrical aircrafts. The alternating current (AC) loss of superconductors caused by time-varying transport currents or magnetic fields (or both) has impaired the efficiency and reliability of superconducting machines, bringing severe challenges to the cryogenic systems, too. Although much research has been conducted in terms of the qualitative and quantitative analysis of AC loss and its reduction methods, AC loss remains a crucial problem for the design of highly efficient superconducting machines, especially for those operating at high speeds for future aviation. Given that a critical review on the research advancement regarding the AC loss of superconductors has not been reported during the last dozen years, especially combined with electrical machines, this paper aims to clarify its research status and provide a useful reference for researchers working on superconducting machines. The adopted superconducting materials, analytical formulae, modelling methods, measurement approaches, as well as reduction techniques for AC loss of low-temperature superconductors (LTSs) and high-temperature superconductors (HTSs) in both low- and high-frequency fields have been systematically analyzed and summarized. Based on the authors’ previous research on the AC loss characteristics of HTS coated conductors (CCs), stacks, and coils at high frequencies, the challenges for the existing AC loss quantification methods have been elucidated, and multiple suggestions with respect to the AC loss reduction in superconducting machines have been put forward. This article systematically reviews the qualitative and quantitative analysis methods of AC loss as well as its reduction techniques in superconductors applied to electrical machines for the first time. It is believed to help deepen the understanding of AC loss and deliver a helpful guideline for the future development of superconducting machines and applied superconductivity.

show abstract

“…However, filament patterning is still in its infancy, and many aspects still need to be ironed out. An additional aspect that needs attention is the need for filament twisting or, preferably, transposition [6]- [8]. Twisting is not really practical in a tape-shaped wire needing to be wound into compact coils of various shapes.…”

Section: Introductionmentioning

confidence: 99%

Novel 2G HTS Multifilamentary Conductor Design for AC Applications

Thieme

Aized

Chevtchenko³

2007

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

2G HTS wires need substantial development to allow ac applications with acceptable losses in ac magnetic fields perpendicular to the tape plane. Filament transposition is necessary to avoid large coupling currents and also to insure a uniform current flow through all the filaments, both of which are essential to minimize ac losses. Conductor twisting solves only the first part of the problem and is not really practical in a tape-shaped wire needing to be wound for instance into compact coils of various shapes. We set out to evaluate a new two-dimensional transposition approach for striated, multifilamentary 2G HTS wire. The new concept uses a so-called transposition zone, located along a linearly striated conductor. In this 7-10 cm long zone all filaments are transposed. The repeat distance of this transposition zone can be as short as 10 m or as long as 100 m, depending on the particular superconducting device and the anticipated ac magnetic fields. In this project a successful transposition approach with acceptable losses was developed. Both the striation method using lateral translations, and sound junction types using different materials, were demonstrated.Index Terms-AC loss, filament transposition, high temperature superconductors, YBa 2 Cu 3 O 7 x .

show abstract

Conceptual approach to the ultimate low AC loss YBCO Superconductor

Cited by 10 publications

References 7 publications

Thin YBa₂Cu₃O_7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

Thin YBa₂Cu₃O_7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Novel 2G HTS Multifilamentary Conductor Design for AC Applications

Contact Info

Product

Resources

About

Conceptual approach to the ultimate low AC loss YBCO Superconductor

Cited by 10 publications

References 7 publications

Thin YBa2Cu3O7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

Thin YBa2Cu3O7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Novel 2G HTS Multifilamentary Conductor Design for AC Applications

Contact Info

Product

Resources

About

Thin YBa₂Cu₃O_7-δpatterns by Chemical Solution Processing using Ink-Jet Printing

Thin YBa₂Cu₃O_7-δpatterns by Chemical Solution Processing using Ink-Jet Printing