Electromagnetic properties of curved HTS trapped field stacks under high-frequency cross fields for high-speed rotating machines

Zhang, Hongye; Mueller, Markus

doi:10.1088/1361-6668/abe4b6

Cited by 16 publications

(14 citation statements)

References 42 publications

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“…In [110], an A-V formulation-based numerical model has been extended from 2D to 3D for simulating the magnetization of superconductors. The electromagnetic characteristics of curved HTS TFSs exposed to high-frequency cross fields have been explored in [111] through the H-formulation-based numerical modelling. It is concluded that the 2D axisymmetric model to approximate a square TFS as a round bulk is inapplicable for studying the electromagnetic distributions of TFSs; thus, a 3D model has to be employed [111].…”

Section: Modelling Methodsmentioning

confidence: 99%

“…The electromagnetic characteristics of curved HTS TFSs exposed to high-frequency cross fields have been explored in [111] through the H-formulation-based numerical modelling. It is concluded that the 2D axisymmetric model to approximate a square TFS as a round bulk is inapplicable for studying the electromagnetic distributions of TFSs; thus, a 3D model has to be employed [111]. An H-formulation-based full 3D time-dependent numerical model for Roebel cables has been proposed in [112].…”

Section: Modelling Methodsmentioning

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: Modelling Methodsmentioning

confidence: 99%

Section: Modelling Methodsmentioning

confidence: 99%

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

Self Cite

View full text Add to dashboard Cite

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“…Additionally, a typical commercial HTS tape is composed of not only the HTS layer but also the non-superconducting overlayer, substrate as well as stabilisers. Therefore, the electromagnetic interactions between the HTS and non-superconducting layers cannot be considered in the analytical equations, especially at high frequencies [33,34]. In addition, the analytical formulae are limited to simple structures, e.g.…”

Section: Numerical Modelling Of Dynamic Resistancementioning

confidence: 99%

Dynamic resistance and dynamic loss in a ReBCO superconductor

Zhang

Shen²,

Chen³

et al. 2022

Supercond. Sci. Technol.

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Dynamic resistance is a time-averaged direct current (DC) resistance in superconducting materials, which typically occurs when a superconductor is carrying a transport DC while simultaneously subject to a time-varying magnetic field. Dynamic resistance has recently attracted increasing attention as it not only causes detrimental dynamic loss in superconducting devices such as the Nuclear Magnetic Resonance (NMR) magnets and superconducting machines, but on the other hand, the generated dynamic voltage can be exploited in many applications, e.g., high temperature superconducting (HTS) flux pumps. This article reviews the physical mechanism as well as analytical, numerical modelling, and experimental approaches for quantifying dynamic resistance during the last few decades. Analytical formulae can be conveniently used to estimate the dynamic resistance/loss of a simple superconducting topology, e.g., a single rare-earth-barium-copper-oxide (ReBCO) tape. However, in a complex superconducting device such as a superconducting machine, the prediction of dynamic resistance/loss has to rely on versatile numerical modelling methods before carrying out experiments, especially at high frequencies up to the kHz level. The advantages, accuracies, drawbacks, and challenges of different quantification approaches for dynamic resistance/loss in various scenarios are all inclusively discussed. The application of dynamic resistance in HTS flux pumps is also presented. It is believed that this review can help enhance the understanding of dynamic resistance/loss in superconducting applications, and provide a useful reference for future superconducting energy conversion systems.

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“…As the operating mode (rating) is changed the motor shaft speed also changes. Magnetic losses in the magnetic circuit of the traction motor depend on the motor shaft speed [191][192][193].…”

Section: Model Of Pulsating Current Traction Motor Taking Into Consideration Magnetic Losses In Steelmentioning

confidence: 99%

Theoretical foundations of engineering. Tasks and problems

Boiko¹,

Boiko²,

Muzyka³

et al. 2021

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All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, distributed, or transmitted, in any form or by any means, or stored in a data base or retrieval system, without the prior written permission of the publisher. The content and reliability of the articles are the responsibility of the authors. When using and borrowing materials reference to the publication is required. Collection of scientific articles published is the scientific and practical publication, which contains scientific articles of students, graduate students, Candidates and Doctors of Sciences, research workers and practitioners from Europe and Ukraine. The articles contain the study, reflecting the processes and changes in the structure of modern science.

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Electromagnetic properties of curved HTS trapped field stacks under high-frequency cross fields for high-speed rotating machines

Cited by 16 publications

References 42 publications

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Dynamic resistance and dynamic loss in a ReBCO superconductor

Theoretical foundations of engineering. Tasks and problems

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