Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.5
2.7
Journals
Applied Sciences
Special Issues
Superconductor Technologies and Their Applications
share announcement

Superconductor Technologies and Their Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Physics General".

Deadline for manuscript submissions: closed (28 February 2021) | Viewed by 16754

Special Issue Editor

Dr. Young Jin Hwang

E-Mail Website
Guest Editor
Korea Basic Science Institute, 169-148 Gwahak-ro, Eoeun-dong, Yuseong-gu, Daejeon, Korea
Interests: superconducting synchronous machine; wireless power transfer system; nuclear magnetic resonance equipment; superconducting magnet

Special Issue Information

Dear Colleagues,

The interest in superconductor technologies and their applications is continuously increasing in the world. The superconducting electrical machine has high power density and demonstrates high efficiency. There has been increased interest in such machines due to their potential for widespread applications, such as industrial applications and applications in electric aircrafts and ships, renewable power generation, Maglev systems, etc.

This Special Issue will focus on superconducting electrical machines. Papers are invited in all different areas of superconductor technologies and their applications, as they are a multidisciplinary topic involving research areas such as electromagnetism, mechanical design, cryogenics, and material issues, as well as economic and environmental aspects. Both theoretical and experimental work, and, especially, the combination of the two, are welcomed.

Papers covering new topologies, structures, analysis methods, control strategies, and new emerging applications of superconductors are strongly welcome. Contributions dealing with advancements made in superconductor materials for electrical machines are also of interest.

Dr. Young Jin Hwang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Superconductors
  • Superconducting generator for renewable power generations
  • Superconducting motor for vehicle applications
  • Control of superconducting machine
  • Fault diagnosis and protection method of superconducting machine
  • Superconducting magnets and their applications

Published Papers (6 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

15 pages, 6728 KiB  
Article
Development of a Cryogen-Free Compact 3 T Superconducting Magnet for an Electromagnetic Property Measurement System
by Jae Young Jang, Myung Su Kim, Young Jin Hwang, Seunghyun Song, Yojong Choi and Yeon Suk Choi
Appl. Sci. 2021, 11(7), 3074; https://doi.org/10.3390/app11073074 - 30 Mar 2021
Cited by 5 | Viewed by 3059
Abstract
A cryogen-free portable 3 T high-temperature superconducting magnet for an electromagnetic property measurement system has been developed to serve as a user facility at the Korea Basic Science Institute. The metallic insulation method was adopted to reduce the charging delay without sacrificing the [...] Read more.
A cryogen-free portable 3 T high-temperature superconducting magnet for an electromagnetic property measurement system has been developed to serve as a user facility at the Korea Basic Science Institute. The metallic insulation method was adopted to reduce the charging delay without sacrificing the self-protecting feature. A genetic-algorithm-aided optimized design was carried out to minimize the superconducting tape consumption while satisfying several design constraints. After the design, the compact high-temperature superconducting magnet composed of eight double-pancake coil modules was wound with high-temperature superconducting tape and stainless steel tape, and integrated with a two-stage cryo-cooler. The 3 T magnet was successfully cooled to approximately 20 K with a cryo-cooler and reached the target field of 3 T without any problems. Long-term measurements and a range of other tests were also implemented to verity the performance of the magnet. Test results demonstrated the feasibility of a cryogen-free portable high-temperature superconducting magnet system for electromagnetic property measurement experiments. Full article
(This article belongs to the Special Issue Superconductor Technologies and Their Applications)
►▼ Show Figures

Figure 1

15 pages, 8850 KiB  
Article
Measurements and Analysis of AC Losses in HTS Windings of Electrical Machine for Different Operation Modes
by Sergey Zanegin, Nikolay Ivanov, Vasily Zubko, Konstantin Kovalev, Ivan Shishov, Dmitry Shishov and Vladimir Podguzov
Appl. Sci. 2021, 11(6), 2741; https://doi.org/10.3390/app11062741 - 18 Mar 2021
Cited by 8 | Viewed by 2126
Abstract
The article is devoted to the study of losses in devices based on high-temperature superconductors of the 2nd generation. The complexity of the devices under study increases from a single rack coil to a winding assembled from several coils, and finally to an [...] Read more.
The article is devoted to the study of losses in devices based on high-temperature superconductors of the 2nd generation. The complexity of the devices under study increases from a single rack coil to a winding assembled from several coils, and finally to an electric machine operating in generator mode. This is the way to experimentally study the behavior of 2nd generation high temperature superconductor (2G HTS) carrying a transport current in various conditions: self-field, external DC, and AC magnetic field. Attention is also paid to the losses in the winding during its operation from the inverter, which simulates the operating conditions in the motor mode of a propulsion system. Full article
(This article belongs to the Special Issue Superconductor Technologies and Their Applications)
►▼ Show Figures

Figure 1

14 pages, 8136 KiB  
Article
Design of the Cryogenic Bypass Line for the SIS100 Synchrotron
by Artur Iluk, Kazimierz Malcher, Wiktor Słomski, Maciej Chorowski, Jarosław Poliński, Thomas Eisel, Branislav Streicher and Peter Spiller
Appl. Sci. 2020, 10(22), 8311; https://doi.org/10.3390/app10228311 - 23 Nov 2020
Cited by 2 | Viewed by 2380
Abstract
This paper presents the selected aspects of a superconducting cryogenic bypass line (BPL) design, a part of the international Facility for Antiproton and Ion Research (FAIR) SIS100 cryogenic system, currently under construction in Darmstadt, Germany. Design, manufacturing, and installation of the superconducting cryogenic [...] Read more.
This paper presents the selected aspects of a superconducting cryogenic bypass line (BPL) design, a part of the international Facility for Antiproton and Ion Research (FAIR) SIS100 cryogenic system, currently under construction in Darmstadt, Germany. Design, manufacturing, and installation of the superconducting cryogenic bypass line is a part of a Polish in-kind contribution to the FAIR project, realized by the Wroclaw University of Science and Technology. The BPL is dedicated to transferring liquid helium and AC electric current between SIS100 arc sections and superconducting quadrupole magnets located in warm straight sections of the synchrotron. A main innovative feature of the cryogenic bypass line is transferring the electric current and liquid helium in one vacuum vessel, while in other similar projects, namely, the Large Hadron Collider at CERN (CH) or the Tevatron at FermiLab (USA), those functions are separated. The coexistence of superconducting busbars and liquid helium process pipes in one limited space, as well as numerous additional functional and technical requirements, was a source of the serious design and production challenges described in the paper, including two designs of the internal suspension system based on steel rods and aramid cables. Full article
(This article belongs to the Special Issue Superconductor Technologies and Their Applications)
►▼ Show Figures

Figure 1

13 pages, 5083 KiB  
Article
Performance Evaluation of Current Leads for a 5 Tesla Electromagnetic Properties Measurement System
by Myung Su Kim, Jae Young Jang, Young Jin Hwang and Yeon Suk Choi
Appl. Sci. 2020, 10(19), 6712; https://doi.org/10.3390/app10196712 - 25 Sep 2020
Cited by 5 | Viewed by 3303
Abstract
The development of the Electromagnetic Property Measurement System is underway at the Korea Basic Science Institute. The Electromagnetic Property Measurement System is used for electrical, thermal, and magnetic specimen property measurements in variable magnetic fields and temperatures with a low-temperature superconducting magnet. To [...] Read more.
The development of the Electromagnetic Property Measurement System is underway at the Korea Basic Science Institute. The Electromagnetic Property Measurement System is used for electrical, thermal, and magnetic specimen property measurements in variable magnetic fields and temperatures with a low-temperature superconducting magnet. To activate low-temperature superconducting magnet that operates with liquid helium, we propose the use of vapor-cooled current leads. The low-temperature superconducting magnet is connected to the power supply at room temperature through a pair of current leads. Accordingly, heat inflows through the current leads and represents one of the major contributory factors of the entire heat inflow. Therefore, design optimization and evaluation of the current leads is necessary to minimize heat and liquid helium consumption. Vapor-cooled, and hybrid current leads were designed and fabricated, and testing in liquid helium cryostat was conducted. The low-temperature superconducting magnet was charged with electrical current up to the operating level, and the liquid helium boil-off rate was measured with respect to the supplied electrical current level. The performances of the two current leads were accessed based on the thermal load and boil-off rate of the liquid helium. The experimental and analyzed liquid helium boil-off rates associated with the current leads were in close agreement. Full article
(This article belongs to the Special Issue Superconductor Technologies and Their Applications)
►▼ Show Figures

Figure 1

15 pages, 5534 KiB  
Communication
An Electromagnetic–Thermal Coupling Numerical Study of the Synchronous Generator with Second-Generation High-Temperature Superconducting Armatures
by Xiangyu Huang, Zhen Huang, Xiaoyong Xu, Wan Li and Zhijian Jin
Appl. Sci. 2020, 10(15), 5228; https://doi.org/10.3390/app10155228 - 29 Jul 2020
Cited by 2 | Viewed by 1951
Abstract
Generators with high-temperature superconducting armatures have an advantage in the fact that they can carry high currents. However, the AC loss of high-temperature superconducting (HTS) armatures is difficult to calculate precisely because HTS coils exist in a complex and time-varying electromagnetic environment. In [...] Read more.
Generators with high-temperature superconducting armatures have an advantage in the fact that they can carry high currents. However, the AC loss of high-temperature superconducting (HTS) armatures is difficult to calculate precisely because HTS coils exist in a complex and time-varying electromagnetic environment. In addition, when the HTS coil is carrying a short circuit fault overcurrent, an electromagnetic–thermal simulation study of this process is required to ensure that the HTS coil is not damaged. In this paper, first, a fully coupled T-A formulation model is used to calculate the AC loss of HTS armatures. Then, the current and temperature distributions are simulated, considering the intrinsic characteristic of superconducting coated conductors, when the generator suffers the worst short circuit fault accidently. It is found that the turn with the lowest critical current quenches after 0.01 s, but the temperature rise cannot damage the coil if the circuit breaker can clear the fault quickly. The effects of the copper stabilizer thickness on the thermal stability of the HTS coil during the worst short circuit fault are also investigated. A thicker copper stabilizer improves the thermal stability of the HTS coil in the event of a short circuit fault, but the use of a simulation model is needed to make trade-offs between the engineering current density and the thermal stability of the HTS tapes. The work in this paper is necessary and can provide an important reference for manufacturing superconducting generators. Full article
(This article belongs to the Special Issue Superconductor Technologies and Their Applications)
►▼ Show Figures

Figure 1

20 pages, 11696 KiB  
Article
A Flux-Controllable NI HTS Flux-Switching Machine for Electric Vehicle Applications
by Young Jin Hwang, Jae Young Jang and SangGap Lee
Appl. Sci. 2020, 10(5), 1564; https://doi.org/10.3390/app10051564 - 25 Feb 2020
Cited by 3 | Viewed by 3136
Abstract
This paper deals with a flux-controllable NI HTS flux-switching machine (FSM) for electric vehicle (EV) applications. In a variable-speed rotating machine for EVs, such as electric buses, electric aircraft and electric ships, an electric motor capable of regulating the flux offers the advantage [...] Read more.
This paper deals with a flux-controllable NI HTS flux-switching machine (FSM) for electric vehicle (EV) applications. In a variable-speed rotating machine for EVs, such as electric buses, electric aircraft and electric ships, an electric motor capable of regulating the flux offers the advantage of constant output operation. In general, conventional HTS rotating machines have excellent flux-regulation performance, because they excite an HTS field coil. However, it is difficult to ensure any flux-regulation capabilities in HTS rotating machines using HTS field coils that apply the no-insulation (NI) winding technique, due to the inherent charge and discharge delays in these machines. Nevertheless, the NI winding technique is being actively researched as a key technology for the successful development of HTS rotating machines, because it can dramatically improve the operational stability of HTS field coils. Therefore, research to implement an HTS rotating machine with flux-regulation capabilities, while improving the operating stability of the HTS field coil using the NI winding technique, is required for EV applications. In this paper, we propose an HTS rotating machine with a flux switching structure, a type of topology of a rotating machine that is being actively studied for application to the electric motors used in EVs. The proposed HTS flux-switching machine (FSM) uses NI field coils, but additional field windings are applied for flux regulation, which enables flux control. In this study, an NI HTS field coil was also fabricated and tested because the characteristic resistance value should be used for the design and characteristic analyses of machines which utilize an NI coil. The simulation model used to analyze the flux-regulation performance capabilities of the NI HTS FSM were devised based on the characteristic resistance values obtained from a charging test of the fabricated NI HTS field coil. This study can provide a good reference for further research, including work on the manufacturing of a prototype NI HTS FSM for EV applications, and it can be used as a reference for the development of other HTS rotating machines, such as those used in large-scale wind power generation, where flux-regulation capabilities are required. Full article
(This article belongs to the Special Issue Superconductor Technologies and Their Applications)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-6
Back to TopTop