Article
Physics, Applied
Liuyuan Yu, Mengdie Niu, Huadong Yong, Youhe Zhou
Summary: This paper uses a 3D coupled electromagnetic-mechanical model to analyze the electromagnetic and mechanical behaviors of HTS racetrack coils, considering coil deformation and the strain dependence of critical current. The validity of the coupled model is verified by comparing numerical results with experimental data. The influences of various parameters on the electromagnetic and mechanical responses of the HTS racetrack coil are also investigated.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
J. Zhao, S. Y. Gao, B. H. Wu, X. S. Yang, B. Shen, W. Chen, Y. Zhao
Summary: This article investigates transport AC losses in a circular HTS conductor coil bent by a conductor on round core (CORC) type cable through experiments and numerical simulations. The effect of different winding methods was also studied. Both experiments and simulations showed that reducing the tape-to-tape frontal area could decrease the transport AC loss, with the optimum winding angle for the HTS CORC coil being 24.15 degrees. The modeling and experiments provide useful optimization strategies for designing high-performance CORC coils/magnets.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Automation & Control Systems
Tsong-Shing Lee, Shyh-Jier Huang, Shuo-Huei Dai
Summary: This article proposes a contactless power transfer technology for rail-guided vehicles with considerations of power equalization and efficiency improvement. By designing a method for evenly distributing power and developing a tracking compensation technique, power output equalization and efficiency improvement are achieved. The experimental results of the hardware circuit show that the maximum efficiency of the system is 90.3%.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Industrial
Limeng Du, Liangyu Xia, Xian Li, Li Qiu, Zhipeng Lai, Qi Chen, Quanliang Cao, Xiaotao Han, Liang Li
Summary: Introducing a resistor in the discharge circuit to adjust the current waveform can significantly reduce Joule heating in the working coil while maintaining the forming depth of workpieces. It has been found that further reducing the line resistance may increase Joule heating in the coil, without significant improvement in forming efficiency. This method shows potential in improving electromagnetic forming processes.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Physics, Applied
Wenxin Li, Tianhui Yang, Ying Xin
Summary: The interaction behavior between superconductor coils and magnet or magnetic field differs fundamentally from that between conventional conductor and magnet. The theory of this electromagnetic interaction remains to be fully developed. This study conducted experiments to investigate the characteristics of interactions between HTS coils and permanent magnets, which can provide valuable insights into the electromagnetic interaction between superconductor and magnetic field, particularly type II superconductors.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Engineering, Electrical & Electronic
Barbara Maria Oliveira Santos, Gabriel dos Santos, Frederic Sirois, Roberto Brambilla, Rubens de Andrade Junior, Felipe Sass, Guilherme Goncalves Sotelo, Francesco Grilli
Summary: This article explains how to model HTS coils with different coupling scenarios in COMSOL Multiphysics using the T-A formulation. It compares and discusses the current density distributions and AC losses of coils in different coupling scenarios, while also pointing out the limits of applicability of the presented approach.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Yoh Nagasaki, Satoshi Sasaki, Masaki Maruyama, Daisuke Miyagi, Makoto Tsuda, Hideaki Miura, Shoichi Yokoyama
Summary: This study experimentally found that Rare Earth Barium-Copper-Oxide (REBCO) coils undergo irreversible deterioration when subjected to axial compressive stress greater than 100 MPa, while reversible reduction of critical current occurs under stress less than 100 MPa. Applying a stress of 100 MPa leads to a reversible decrease of critical current by about 15%.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Thermodynamics
Yoon Seok Chae, Huu Luong Quach, Hyung-Wook Kim, Young-Sik Jo, Ho Min Kim, Ji Hyung Kim, Yong Soo Yoon
Summary: The operational characteristics of a contactless superconducting field exciter (CSFE) for high-temperature superconducting (HTS) synchronous machines are investigated. An improved CSFE is developed using active rotating-type PMs to enhance control of the field winding in HTS synchronous machines. Experimental analysis shows that the new function of the CSFE effectively controls the noncontact charging current, facilitating its application in electric propulsion systems using superconducting motors.
Article
Chemistry, Physical
Longyu Hu, Meenakshi Ranasinghe, Yadong Zhou, George Chumanov, Jeffrey N. Anker, Apparao M. Rao
Summary: This study reports the assembly of linear and circular nanoparticle chains using atomic force microscopy, and investigates their plasmonic properties. Assembly of nanoparticles into chains alters their plasmon resonance modes, which can be excited and imaged using a polarizer and dark-field microscopy. Discrete dipole simulations and the study of the incident light angle in dark-field microscopy confirm the accuracy of the experimental results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Stavros P. Filippidis, Aggelos S. Bouhouras, Nikolaos Poulakis, Theodoros Theodoulidis, Georgios C. Christoforidis
Summary: This article provides a narrative and systematic review of the literature on electromagnetic optimization of superconducting solenoidal magnets and coils. It focuses on the evolution of techniques used to achieve field homogeneity, field intensity, stored energy, and secondary aspects. The review is organized in chronological order and categorized in tables based on the optimization targets. The article also discusses the existing literature gaps and the optimization techniques used in magnetic resonance imaging and superconducting magnetic energy storage devices, highlighting the less frequent use of modern techniques compared to older ones.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Automation & Control Systems
Bangcheng Han, Jianzhi Yang, Xu Zhang, Minxia Shi, Shuai Yuan, Ling Wang
Summary: A new method for magnetic compensation is introduced in this article, which uses biplanar coils to design and fabricate a magnetic compensation system to effectively compensate the background field inside the MSR and avoid coupling effects.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Sheng Liu, Yue Feng, Wanying Weng, Jinghui Chen, Jiande Wu, Xiangning He
Summary: This article proposes a novel online mutual inductance measurement method using a sandwich structure detection coil. The method accurately measures the mutual inductance and receiver current by measuring the induced voltage of the sandwich coil and the output voltage of the inverter. Experimental results show that the method provides stable and accurate measurements.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
K. Takahashi, A. Badel, T. Okada, S. Awaji, H. Miyazaki, S. Hanai, S. Ioka
Summary: This article describes the plan to upgrade the 25T cryogen-free superconducting magnet to a 30T magnet at the High Field Laboratory for Superconducting Materials, Tohoku University. A robust coil concept with REBCO coils was adopted and tested for its effectiveness through stress tests and performance evaluation.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Zhuyong Li, Yingying Lv, Meiying Yin, Changxia Liu, Jian Li, Kun Liang, Junjie Jiang, K. Ryu, Zhiyong Hong, Zhijian Jin
Summary: Effective quench detection technologies are crucial for protecting high temperature superconducting applications. An OF-tape with distributed temperature sensing technology was proposed for quench detection, and the experiment showed accurate temperature measurement and the highest temperature occurring at the middle turn of the OF-coil after quench. Additionally, a trade-off between response time and noise signal should be considered for efficient quench detection.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Computer Science, Information Systems
Taehwa Lee, Daniel Hashemi, Kenichi Yatsugi, Michio Yasunishi, Hiroshi Yoshimoto, Hideo Iizuka
Summary: A magnetically coupled three-coil system with one transmitting coil and two receiving coils was studied, showing that the position of the transmitting coil can be estimated under certain conditions by the ratio of received wave amplitudes and its angular derivative. A coupled mode theory was developed to explain the midrange position sensing mechanism, where the ratio of received wave amplitudes is inversely proportional to the coupling strengths of each receiving coil to the transmitting coil at the intrinsic resonance frequency of the receiving coils.
