Article
Energy & Fuels
Abhinav Kumar, Seepana PraveenKumar, Ashish Agrawal, Vladimir Ivanovich Velkin
Summary: A comprehensive numerical model was established to estimate AC losses among stacked/coiled coils used in superconducting magnetic energy storage systems. By considering external fields and utilizing a homogenization approach, it was found that perpendicular fields have a significant impact on AC losses compared to parallel fields.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Tianyong Gong, Guangtong Ma, Jing Li, Zhengwei Zhao, Ruichen Wang
Summary: This study focuses on the design and optimization of high temperature superconducting (HTS) magnets and null-flux coils to enhance the overall performance of a liquid-helium-free electrodynamic suspension train. By establishing an improved load-line method and a semianalytical model, the researchers successfully achieved optimized design and demonstrated the effectiveness of the optimization methodology.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2022)
Article
Engineering, Electrical & Electronic
Roberto A. H. de Oliveira, Joao Murta-Pina, Maria Belen Rivera, Alfredo Alvarez, Stanimir Valtchev, Anabela G. Pronto, Pilar Suarez
Summary: Superconductivity is a unique state of matter that exhibits zero electrical resistivity at cryogenic temperatures. To make superconducting devices economically viable, efficient cooling systems are crucial to manage the heat generated during operation. This article focuses on predicting losses in superconducting coils due to noncharacteristic current harmonics, with results validated through experimental tests.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
H. Oya, Y. Shirai, R. Kawasaki, F. Matsumoto, Y. Maeda, G. Matsumoto, M. Shiotsu, S. Imagawa, A. Iwamoto, S. Hamaguchi, M. Tsuda, Y. Nagasaki, T. Yagai, H. Kobayashi, M. Ohya
Summary: Development of low-capacity high-temperature superconducting (HTS) coils cooled by gas helium or refrigerant in the temperature range of 15-40 K is ongoing. Liquid hydrogen, with a saturation temperature of 20.7 K, is a potential candidate for refrigerant cooling of large-capacity HTS coils. However, the handling difficulties of liquid hydrogen have limited the studies in this area.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Wenxin Li, Tianhui Yang, Ying Xin
Summary: The new methods developed in this study utilize the interaction between a permanent magnet and a superconducting coil or normal conducting ring to measure inductance and resistivity without requiring a power supply or voltmeter. The inductance of a superconducting coil can be obtained by measuring the force and induced current curves during interaction with a permanent magnet.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Electrical & Electronic
Xing Huang, Xinning Hu, Zili Zhang, Chunyan Cui, Hao Wang, Feifei Niu, Yuan Zhang, Luzhong Wang, Qiuliang Wang
Summary: This study developed an analytical computation model based on the Maxwell-London equations to investigate the temperature effect on the levitation force of a superconducting sphere. The results showed that the temperature coefficient of the levitation force depends linearly on the effective penetration depth of the superconducting sphere, and Nb coating on the sphere's surface is an effective solution to avoid the need for passive isolation.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Minghang Lu, Ruiwu Cao
Summary: LSRM and LFSM have advantages of non-adhesive thrust force and simple secondary structures, suitable for various applications; HTS-LFSM and HTS-LSRM improve power density by using high temperature superconducting coils; Despite similar structure, they have different working principles and electromagnetic performances.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Engineering, Electrical & Electronic
S. C. Richter, A. Ballarino, A. Bernhard, A. W. Grau, D. Saez de Jauregui, A. -s. Mueller
Summary: Short and high-field undulators are important for compact free-electron lasers and future colliders. This paper presents the design and manufacturing of high-temperature superconducting undulator coils at CERN, which showed safe operation at 4.2 K with high magnetic fields.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Energy & Fuels
Chao Li, Gengyao Li, Ying Xin, Wenxin Li, Tianhui Yang, Bin Li
Summary: This paper presents a high-temperature superconducting energy conversion and storage system that efficiently stores and releases electromagnetic energy without power electronic converters. The system is based on the interaction between multiple high temperature superconducting coils and a permanent magnet. Simulation and experimental tests have verified the system's working principle and performance. It shows promising application prospects in the fields of railway transportation, electromagnetic catapult, and superconducting magnetic energy storage.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Electrical & Electronic
Masazumi Noguchi, Youdai Okazaki, Takumi Takazawa, Tetsuji Okamura, Naoki Hirano
Summary: This study analyzed the cooling performance of a circulation cooling system using a room temperature compressor and cryofan as the circulation device, and using helium and hydrogen as the refrigerant. The results showed that the system with the cryofan had higher cooling capacity, and hydrogen had better cooling performance compared to helium.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Zhen Lu, Yawei Wang, Qingqing Yang, Wenbo Xue, Yutong Fu, Zhiyong Hong, Zhijian Jin
Summary: This paper investigates the effect of copper rings and plates on the fast discharging process of an insulated HTS double pancake coil. An optimized structure composed of copper rings and plates is proposed, showing promising results in accelerating energy release and reducing hot spot temperature of the coil.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Thanatheepan Balachandran, Andy Yoon, Dongsu Lee, Jianqiao Xiao, Kiruba S. Haran
Summary: Offshore wind turbines are crucial for increasing the use of green energy in the electricity market. Superconducting wind turbine generators offer higher air-gap flux density and power density. This article proposes a hybrid design approach to achieve high field and high efficiency offshore wind turbines.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Engineering, Electrical & Electronic
Philip Machura, Quan Li
Summary: This article investigates the impact of flux diverters on HTS double pancake coils operating at high frequencies up to 85 kHz. It is shown that flux diverters are a viable option to reduce coil losses, with width having the biggest impact on loss reduction. In general, flux diverters are more suitable for applications with high load factors.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Engineering, Civil
Mengxiao Song, Danfeng Zhou, Peichang Yu, Yukai Zhao, Yichuan Wang, Yiqiu Tan, Jie Li
Summary: This paper derives an analytical calculation model for electromagnetic forces in SC EDS system and verifies it using experimental data. The results of the experiment confirm the effectiveness of the proposed calculation model.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Chemistry, Multidisciplinary
Yejin Lee, Mickey Martini, Tommaso Confalone, Sanaz Shokri, Christian N. Saggau, Daniel Wolf, Genda Gu, Kenji Watanabe, Takashi Taniguchi, Domenico Montemurro, Valerii M. Vinokur, Kornelius Nielsch, Nicola Poccia
Summary: A new method of fabricating twisted van der Waals heterostructures can improve the performance of Josephson junctions in high-temperature cuprate superconductors, making them comparable to intrinsic junctions in bulk samples. The method combines cryogenic stacking and covering the interface with insulating hexagonal boron nitride crystals. The study also shows that encapsulated interfaces are more stable than unencapsulated ones.
ADVANCED MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Haoran Meng, Hao Su, Timing Qu, Liping Lei
Summary: This experimental study investigates the effect of surge and sway motions on the wake characteristics of a wind turbine model. The results show that the mean velocity profiles of the downwind wakes during the surging and swaying process are almost the same as a base-fixed turbine model. However, there are maximum mean velocity differences near the blade tips for both motions compared to the base-fixed cases. The instantaneous velocity profiles also reveal a lateral offset for the swaying turbine at the two ends of the sway motion, which gradually decreases and disappears with increasing downstream distance.
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Haoran Meng, Hao Su, Jia Guo, Timing Qu, Liping Lei
Summary: Wind tunnel experiments were conducted to investigate the power and thrust characteristics of a wind turbine model under various surge and sway motions. Results showed that while these motions minimally affected the mean power output and rotor thrust, the rotor thrust fluctuations during surging were significantly higher than during swaying motions, and increased with surge frequency and amplitude. Additionally, the rotor thrust showed periodic fluctuations corresponding to the surge and sway motions, with peak power spectral density at the motion frequency and odd multiples.
Article
Physics, Applied
Yufan Yan, Yi Li, Timing Qu
Summary: This paper reviews recent research efforts in understanding and tackling the technological issues related to screening currents in REBCO conductors. For the screening current induced magnetic field (SCF), the focus is on the latest observations in high-field experiments and various mitigation methods. For the screening current induced stress (SCS), recent studies including experimental characterizations, numerical modelling, and possible countermeasures are presented. It remains an open question to precisely predict the SCS in large-scale HTS magnets. Minimizing the influence of SCF and SCS is one of the key technical challenges for the design of future UHF magnets.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Review
Physics, Applied
Qiuliang Wang, Jianhua Liu, Jinxing Zheng, Jinggang Qin, Yanwei Ma, Qingjin Xu, Dongliang Wang, Wenge Chen, Timing Qu, Xingyi Zhang, Donghui Jiang, Yaohui Wang, Benzhe Zhou, Lang Qin, Huan Jin, Huajun Liu, Yujia Zhai, Feng Liu
Summary: This paper reports on the research status of UHF superconducting magnets in China from different perspectives, including design options, technical features, experimental progress, opportunities, and challenges.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yi Li, Siwei Chen, Mahesh Paidpilli, Rohit Jain, Chirag Goel, Venkat Selvamanickam
Summary: A reel-to-reel scanning Hall-probe microscopy system has been developed to characterize REBCO conductors. This system enables contact-free and non-destructive 2-dimensional imaging of critical current density distribution by mapping the screening-current-induced field of a magnetized conductor. The system overcomes the challenges of measuring weak screening-current-field signals in a strong background field.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Chang Liu, Shutong Deng, Shengnan Zou, Pengrong Chen, Ying Liu
Summary: Magnetic drug targeting (MDT) is a method of remotely delivering drugs to specific areas of the body using a magnetic field. A new hybrid array structure composed of permanent magnets (PMs) and electromagnets is introduced in this study, providing a convenient and energy-efficient approach for delivering magnetic drug particles.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Computer Science, Information Systems
Xiaoyi Zhou, Shengnan Zou, Shoujun Song, Wei Chen, Zhanjun Chen, Jiaojiao Xu, Ming Yan
Summary: Aircraft electrification is a growing trend, and high-temperature superconducting (HTS) electrical machines are being explored for airborne applications. In this study, a hybrid-HTS airborne synchronous generator was proposed and optimized, showing high power density and efficiency.
Article
Physics, Applied
Eduard Galstyan, Janakiram Kadiyala, Mahesh Paidpilli, Chirag Goel, Jithin Sai Sandra, Vamsi Yerraguravagari, Goran Majkic, Rohit Jain, Siwei Chen, Yi Li, Robert Schmidt, Jan Jaroszynski, Griffin Bradford, Dmytro Abraimov, Xavier Chaud, Jungbin Song, Venkat Selvamanickam
Summary: By using advanced MOCVD tapes, REBCO symmetric tape round (STAR((R))) wires with 1.5-2.5 mm diameter and 4-12 strands have been successfully fabricated. It has been demonstrated that 1.5 mm diameter wires made with just 4 advanced MOCVD tape strands can achieve the same critical current (I-c) as 2.5 mm diameter wires made with 12 commercial-grade tape strands. These results indicate that the cost of STAR((R)) wires can be reduced by using fewer high-performance advanced MOCVD tapes while maintaining superior bend performance.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Mahesh Paidpilli, Chirag Goel, Siwei Chen, Yi Li, Rohit Jain, Vinay Shyam, Mahandar Oad, Vamsi Yerraguravagari, Eduard Galstyan, Goran Majkic, Robert M. Schmidt, C. M. Rey, T. H. Carnes, Venkat Selvamanickam
Summary: REBCO tapes have great potential in next-generation electric machines. A pilot-scale A-MOCVD manufacturing tool has been developed to produce 50-meter-long REBCO tapes with film thickness over 4 μm. The composition of these tapes has been optimized for high critical current in low magnetic fields, specifically for use in an industrial motor. Several tapes with uniform critical current over 1,750 A/12 mm at 65 K, 0.25 T have been fabricated and tested for a rotor coil in a 500 HP motor.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Liangjun Shao, Xintao Zhang, Zhirong Yang, Yubin Yue, Yufan Yan, Peng Song, Yi Li, Huajun Liu, Fang Liu, Timing Qu
Summary: A 20-T/17-mm HTS magnet was developed and tested, consisting of a 15-T NI REBCO insert (Coil 1) nested in a 5-T MI REBCO coil (Coil 2). The magnet experienced multiple quenches during the charging process, leading to the degradation of Coil 1. After re-warming, Coil 1 showed a significantly lower critical current. The degradation was investigated through various examinations and probable causes were proposed.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Automation & Control Systems
Qianmei Feng, Shenglin Peng, Ying Lin, Siwei Chen, Mahesh Paidpilli, Chirag Goel, Eduard Galstyan, Venkat Selvamanickam
Summary: This study proposes a strategy for controlling the manufacturing process of HTS tapes, which improves the uniformity of the tapes through local measurement and real-time evaluation, and performs particularly well on tapes with low uniformity.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
