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ISSN: 2772-8307
Copyright © 2026 Shanghai Jiaotong University. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
cited:12
A superconducting wireless energiser based on electromechanical energy conversion
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Article Number:Article 100057
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Abstract
Corresponding email:hongye.zhang@manchester.ac.uk; yang_tianhui@tju.edu.cn
A superconducting magnet (SM) can produce high magnetic fields up to a dozen times stronger than those generated by an electromagnet made of normal conductors or a permanent magnet (PM), and thus has attracted increasing research efforts in many domains including medical devices, large scientific equipment, transport, energy storage, power systems, and electric machines. Wireless energisers, e.g., high temperature superconducting (HTS) flux pumps, can eliminate the thermal load from current leads and arc erosion of slip rings, and are thus considered a promising energisation tool for SMs. However, the time-averaged DC output voltage in existing HTS flux pumps is generated by dynamic resistance: the dynamic loss is unavoidable, and the total AC loss will become significant at high frequencies. This study introduces a highly efficient superconducting wireless energizer (SWE) designed specifically for SMs. The SWE takes advantage of the inherent properties of a superconducting loop, including flux conservation and zero DC resistivity. Extensive theoretical analysis, numerical modelling exploiting the H-ϕ formulation, and experimental measurements were conducted to demonstrate the efficiency and efficacy of the novel SWE design. The electromechanical performance and loss characteristics of the SWE system have also been investigated. Compared to conventional HTS flux pumps, the proposed SWE has lower excitation loss, in the order of 10−1 mW, and thus can achieve a high system efficiency of no less than 95%. Furthermore, it has a simpler structure with higher reliability, considered ready for further industrial development. In addition to deepening the understating of the intricate electromechanical dynamics between magnetic dipoles and superconducting circuits, this article provides a novel wireless energisation technique for SMs and opens the way to step changes in future electric transport and energy sectors.
cited:19
Magnetic bearings with double crossed loops modelled with T-A formulation and electric circuits
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Article Number:Article 100058
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Abstract
Corresponding email:barbara.santos@eng.uerj.br
The application of High-Temperature Superconductor (HTS) coils made of coated conductors has been investigated for many years. A possible configuration for such coils is the jointless loop, also known as the ring coil. The double crossed loop coil (DCLC) has been successfully applied in superconducting magnetic bearings (SMBs). The design of SMBs with DCLCs requires flexible modelling to allow all parts of the device to be represented. This work proposes the T-A formulation with a thin-film approximation for modelling SMB with DCLCs in the finite element analysis framework. A 2D representation of the system is coupled with an external electric circuit to model the continuity of the lines that represent the parts of each jointless loop. To couple the T-A formulation and the circuit, an average of the total electric field, with both resistive and inductive components, is applied to the circuit. The total current computed by the circuit is applied to the T-A formulation. The proposed methodology was validated by comparison with levitation force experimental data. Two types of tests were simulated: five levitation force tests and three guidance force tests. It is shown that there is a limit to the behaviour of the levitation force related to the high-loss state. Below this limit, the stack of DCLCs behaves as an equivalent bulk. Beyond this limit, a high-loss state appears as a linear growth of the levitation force. It is also shown that this high-loss state in vertical displacement influences the lateral force.
cited:1
The event and skepticism for the electrical conductor LK-99 at ambient temperature and pressure
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Article Number:Article 100059
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cited:13
Charging process simulation of a coil by a self-regulating high-Tc superconducting flux pump
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Article Number:Article 100061
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Abstract
Corresponding email:pengbo.zhou@kit.edu
Self-regulating high-temperature superconducting (HTS) flux pumps enable direct current injection into a closed-loop superconducting coil without any electrical contact. In this work, the process of charging a coil by a self-regulating HTS flux pump is examined in detail by numerical modeling. The proposed model combines an -formulation finite element method (FEM) model with an electrical circuit, enabling a comprehensive evaluation of the overall performance of self-regulating HTS flux pumps while accurately capturing local effects. The results indicate that the proposed model can capture all the critical features of a self-regulating HTS flux pump, including superconducting properties and the impact of the secondary resistance. When the numerical results are compared to the experimental data, the presented model is found to be acceptable both qualitatively and quantitatively. Based on this model, we have demonstrated how the addition of a milliohm range, normal-conducting secondary resistance in series with the charging loop can improve the charging process. In addition, its impact on the charging performance is revealed, including the maximum achievable current, charging speed, and the generated losses. The modeling approach employed in this study can be generalized to the optimization and design of various types of flux pumps, potentially expediting their practical application.
cited:5
Hope and challenge of ternary hydrogen-based superconductors under pressure
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Article Number:Article 100046
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cited:28
Concept design of an HTS linear power generator for wave energy conversion
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Article Number:Article 100043
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Abstract
Corresponding email:pkambo3@gmail.com
We show a conceptual structure for a wave energy converter, which features a direct-drive linear power generator with REBaCuO high-temperature superconducting (HTS) bulk field poles and driven by a heaving buoy. A dual translator power generation system of the proposed concept structure is a linear generator in which both the HTS bulks and armature copper coils move in opposite directions simultaneously. A performance analysis of our linear generator was conducted using a finite-element electromagnetic field analysis method. The results of the analysis were compared between the HTS dual translator linear power generator and the HTS single translator linear power generator. The maximum electromagnetic force and the average output power of the HTS dual translator are around 5 % and 11 % higher than that of the HTS single translator. We further present the results of the analysis regarding the influence of reducing the stroke length of the linear generator translator on the output power, where the output power for the HTS dual translator system increased up to a factor of two, in comparison to the HTS single translator counterpart, for the same reduction of stroke length.
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