Superconducting Magnets

Hull, J.R.; Wilson, M.N.; Bottura, L.; Rossi, L.; Green, Michael A.; Iwasa, Y.; Hahn, Seungyong; Duchateau, J.L.; Kalsi, S.S.

doi:10.1002/9783527670635.ch4

Cited by 4 publications

(3 citation statements)

References 259 publications

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“…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%

“…However, at high frequencies, the coupling loss between filaments will increase rapidly and begin to dominate. 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].…”

Section: Roebel Rutherford-type and Corc ® Cablesmentioning

confidence: 99%

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Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

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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.

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Section: Roebel Rutherford-type and Corc ® Cablesmentioning

confidence: 99%

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

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“…These include low magnetic field systems like cables, transformers, and motors, qubits for quantum computers and, more significantly, high field devices for medical diagnostic, accelerators in particle physics and plasma confinement for fusion technology. [1,2] Hundreds of superconducting material families have been discovered, among which the copper-oxides [3] with critical temperatures (T c ) exceeding 100 K, MgB 2 with T c =39 K, [4] the ferro-pnictides reaching a T c of 55 K, [5,6] and more recently the high pressure hydrides, [7][8][9][10] with critical temperatures close to room values.…”

Section: Introductionmentioning

confidence: 99%

Sampling the Materials Space for Conventional Superconducting Compounds

Cerqueira,

Sanna,

Marques

2023

Advanced Materials

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It performs a large scale study of conventional superconducting materials using a machine‐learning accelerated high‐throughput workflow. It starts by creating a comprehensive dataset of around 7000 electron–phonon calculations performed with reasonable convergence parameters. This dataset is then used to train a robust machine learning model capable of predicting the electron–phonon and superconducting properties based on structural, compositional, and electronic ground‐state properties. Using this machine, it evaluates the transition temperature (Tc) of approximately 200 000 metallic compounds, all of which are on the convex hull of thermodynamic stability (or close to it) to maximize the probability of synthesizability. Compounds predicted to have Tc values exceeding 5 K are further validated using density‐functional perturbation theory. As a result, it identifies 541 compounds with Tc values surpassing 10 K, encompassing a variety of crystal structures and chemical compositions. This work is complemented with a detailed examination of several interesting materials, including nitrides, hydrides, and intermetallic compounds. Particularly noteworthy is LiMoN2, which it predicts to be superconducting in the stoichiometric trigonal phase, with a Tc exceeding 38 K. LiMoN2 is previously synthesized in this phase, further heightening its potential for practical applications.

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Recent Advances in Direct-Drive Power Take-Off (DDPTO) Systems for Wave Energy Converters Based on Switched Reluctance Machines (SRM)

Blanco

Torres

Santos-Herrán

et al. 2021

Ocean Engineering &Amp; Oceanography

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This chapter is focused on Power Take-Off (PTO) systems for wave energy converters (WEC), being one of the most important elements since PTOs are responsible to transform the mechanical power captured from the waves into electricity. It presents Direct-Drive PTO (DDPTO) as one of the most reliable solutions to be adapted to some particular types of WEC, such as point absorbers. A discussion about modularity and adaptability, together with intrinsic characteristics of direct-drive PTOs, is also included. Among the different technologies of electric machines that can be used in direct-drive linear PTOs, switched reluctance machines (SRM) are described in further detail. In particular, the Azimuthal Multi-translator SRM is presented as a suitable solution in order to increase power density and reduce costs. Not only the electric machine, but also the associated power electronics are described in detail. The description includes the different configurations and topologies of power converters and the most appropriate control strategies. Finally, a superconducting linear generator solution is described, presenting it as a reliable alternative for the application of direct-drive PTOs. An example of concept and preliminary design is included in order to highlight the main challenges to be faced during this process.

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Superconducting Magnets

Cited by 4 publications

References 259 publications

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Sampling the Materials Space for Conventional Superconducting Compounds

Recent Advances in Direct-Drive Power Take-Off (DDPTO) Systems for Wave Energy Converters Based on Switched Reluctance Machines (SRM)

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