The HOLMES experiment will perform a precise calorimetric measurement of the end point of the Electron Capture (EC) decay spectrum of Ho in order to extract information on neutrino mass with a sensitivity below 2 eV. In its final configuration, HOLMES will deploy 1000 detectors of low temperature microcalorimeters with implanted Ho nuclei. The baseline sensors for HOLMES are Mo/Cu TESs (Transition

This paper investigates modified flux-coupling-type superconducting fault current limiters (SFCLs) for enhancing the transient stability of a multi-machine power system (MMPS). The clustering architecture of the MMPS with the modified SFCLs is presented, and the transient energy function (TEF) of the MMPS is established. Through clarifying the potential influence of the modified SFCLs, theoretical

The linear-motor type flux pump is a wireless DC power source for high-temperature superconducting coils, which is compact in size, efficient in energy use, fast in output control, etc. It consists of three major parts: DC windings, phase windings and iron circuit, which generates a DC-bias AC travelling wave in its airgap. In theory, there are three controllable parameters such as DC-bias field, amplitude

This paper proposes an improved flux-coupling-type superconducting fault current limiter (FC-SFCL) with multiple working modes, and investigates the efficacy of the improved FC-SFCL in guarding a medium-voltage wind turbine generation system (WTGS). The improved FC-SFCL is mainly consisting of a coupling inductance with superconducting and conventional coils, two high-speed switches, a shunt resistance

A linear-rotary motion permanent magnet (PM) generator is investigated with six axial modular E-shaped stator sections arranged circumferentially, which can meet the requirement of wave and tidal energies generation. The PM pole is magnetized in radial direction, and the adjacent PM poles with opposite magnetized directions are interlaced by half mover pole pitch both in circumferential and axial directions

Aiming to study the stray losses and temperature distribution of power transformer ascending flange, a 1:1 test model is built, and the corresponding three-dimensional (3D) finite-element analysis (FEA) model is established. Then the influence of shielding on stray losses distribution is simulated by surface impedance method, and the 4mm copper shielding is selected as the optimized one. Besides, a

In order to accurately analyze the effect of combined magnetic shielding on stray load losses of converter transformer, a three-dimensional (3D) finite-element analysis (FEA) model is established. The total losses can be gotten by summing the simulated losses of each harmonic. The effectiveness of the presented simulation method is verified by comparing the simulated and tested stray load losses of

Due to the low electrical losses and low charging power requirements, the application of superconducting inductors in the inductive pulsed power supply (IPPS) for Electromagnetic Launch (EML) has great potential. In our previous studies, a repetitive IPPS circuit was proposed based on a high temperature superconducting pulsed power transformer (HTSPPT), which can recover the residual energy of the

Magnetic levitation vehicles are means of transport that move without touching the ground by the action of magnetic forces. The electrodynamic levitation technique uses the repulsive forces that arise from the interaction between any variable magnetic field and a good electrical conductor. This work aims to organize in a didactic manner the main topics involving electrodynamic suspension applied to

The traditional permanent magnet electrodynamic suspension (PMEDS) structure has a high cost and low lift to drag ratio caused by sizeable magnetic resistance, which limits its widespread use. Hence, an annular Halbach structure of permanent magnet electrodynamic wheel (EDW) is studied in this paper, which is able to convert the magnetic resistance into the thrust force and avoid extra energy consumption

In this paper, a five-degree-of-freedom (5-DOF) DC hybrid magnetic bearing (HMB) for supporting the high-speed motor is proposed. The rotor in the novel HMB is easy to achieve 5-DOF stable levitation, of which the decoupling and levitation performance are enhanced. The equivalent magnetic circuit method (EMCM) and finite element analysis (FEA) are employed to verify its reliability and rationality

A prototype of the high temperature superconducting (HTS) Maglev system for the electromagnetic launch was built in our laboratory. To meet the higher carrying capacity requirement of this practical application, multi-pole permanent-magnet guideways (PMGs) with different flux concentration methods and various arrangement schemes of HTS bulks have been proposed. The magnetic field distribution of these

In 2017,The Institute of Plasma Physics Chinese Academy of Sciences (ASIPP) has announced a project to develop a 14 T MRI for the research of brain science and neurology. A type of conductor like 11.7 T MRI Magnet is developed for main coil of 14T MRI, which is called Rutherford cable in channel (RIC). Conductor of 14 T MRI magnet is subjected to huge electromagnetic loads and mechanical load during

The High-temperature Superconducting (HTS) magnet is one of the most promising technologies to accommodate various high field applications. With the high magnetic field, the quench problem of HTS material should be considered with extra care, and the specific quench protection scheme should be projected. In this article, the modeling of the quench protection of an HTS magnet for the MRI system is presented

Superconducting DC energy pipeline combines long-distanceelectricity and liquified natural gas transmission, which could improve the overall efficiency of the pipeline system and save construction space. The characteristics of superconducting DC energy pipelines with bipolar coaxial, double-core and partitioned structural layouts are analyzed and compared in this paper, which are significant for the

Superconducting energy pipelines (SEPs) which can simultaneously transmit liquefied natural gas (LNG) and electricity over long distances are proposed these years. SEPs combining LNG pipelines and high-temperature superconducting (HTS) cables together have higher transmission efficiency. The stable and reliable operation of SEPs during short-circuit faults is important. The HTS cable generating heat

The engineering design of the China Fusion Engineering Test Reactor (CFETR) has been completed in 2020. A largescale R&D project for CFETR named the comprehensive research facility for fusion technology (CRAFT) was initiated in Sep. 2019. As a sub-task of the CRAFT, a superconducting experiment testing platform (Super-X for short) is planned to be constructed for evaluating the future superconducting

The high on-state loss of cryogenic solid-state circuit breakers makes it a heavy burden in realizing the High-Temperature Superconducting (HTS) electrical system. Due to the ability to work in cryogenic circumstances and extremely low on-state loss, the LN 2 switch shows excellent application potential in the HTS electrical system. However, the effect of the magnetic fields on the arcing process in

In this paper, a new hybrid-excited doubly salient dual-PM machine (HE-DSDPMM) with dc-biased sinusoidal current is proposed. The HE-DSDPMM employs yoke-PM and slot-PM simultaneously to introduce parallel dual-PM flux to increase the torque production. In addition, the dc-biased sinusoidal current is used in HE-DSDPMM to achieve the flux regulation without field windings. The configuration and working

The multi-disc axial flux permanent magnet synchronous machine (AFPMSM) can provide high fault tolerance capability in applications requiring high reliability. Firstly, a topological structure of coreless AFPMSM is proposed, the magnetic circuit and the air-gap flux intensity are discussed in detail to improve stable operation of machine in this paper. The relationship between air-gap flux density

The flux-modulated machine based on air-gap magnetic flux modulation theory has become a focus in low speed and high torque density applications. In this paper, the optimal design of a large scale flux modulation (FM) permanent magnet (PM) generator with high temperature superconducting (HTS) bucks for wind energy conversion systems is presented. Firstly, the working performances of the generator with

Electrification of rural islands is still a major challenge for many countries due to the inadequate and inchoate distribution of fossil fuels in conventional grid system. Even if these problems are eliminated, the high electricity cost makes rural people ineligible for electricity services. In addition to tackling environmental pollution, microgrids (MG) could be the appropriate solution to reduce

This paper proposes the two-stage optimization of superconducting magnetic energy storage (SMES) integrated into hybrid wind/photovoltaic (PV) generators considering the state of charge (SOC) control for stabilizing voltage and power fluctuations. The first stage aims to achieve the minimal coil inductance of SMES that guarantees the stored energy for system stabilization. In the second stage, the

The high temperature superconducting (HTS) cable can be used as a low-voltage tie line between substations for its characteristic of high currentdensity. In this way, the remaining capacity on the low-voltage side of the transformer can be fully utilized. Moreover, The HTS cable can run in parallel with the original tie line, forming an electromagnetic ring network, to ensure the power supply of important

This paper presents the loss analysis on the saturated iron-core superconducting fault current limiter (SISFCL) for a VSC-HVDC transmission system. The numerical model of SISFCL as well as its loss calculation on superconducting parts were carried out by the finite-element method (FEM) using the H -formulation merged into the commercial package COMSOL. The SISFCL model was established for a practical

The doubly fed induction generator (DFIG) has been required to operate continuously when confronted with faults. For improving its fault ride through capability (FRT), a novel modified bridge-resistive-type superconducting fault current limiter (MBR-SFCL) is put forward in this paper. Compared with the conventional SFCL, the steady-state operating loss is reduced, and the resistance value can be controlled

HTS stack has high current carrying capacity which is widely used in motors or generators. Usually, the HTS tapes are stacked and soldered together at ends. Although the HTS tapes are insulated and have low loss, the soldering parts are conventional conductors with resistance. When the HTS stack is subject to a parallel ac magnetic field, the coupling currents are induced because of the soldered parts

MgB 2 superconducting materials have important application potential in the 20K temperature region, which is a significant advantage compared with other low-temperature superconductors (such as Nb-Ti and Nb3Sn). However, there is a big gap between its superconducting current-carrying capacity and Ni-Ti and Nb 3 Sn, which is due to the weak magnetic flux pinning force and the poor connection between

FeSe superconducting bulks with different Fe contents were prepared by high energy ball milling aided sintering process followed by a post annealing process in low oxygen atmosphere. The influences of Fe content, annealing temperature and oxygen partial pressure have been systematically studied. It was found that both the critical temperature and superconducting phase volume ratio have been obviously

In this paper, the effect of harmonic voltage on partial discharge properties of LN 2 /PPLP (Liquid nitrogen/ Polypropylene-Laminated-Paper) insulation system for high-temperature superconducting (HTS) DC cable is studied. The harmonic components with a frequency from 50 to 350 Hz are superimposed on the DC voltage to analyze the mechanism of the harmonic amplitude and order on partial discharge (PD)

The magnetic property measurementfor grain oriented (GO) silicon steel sheet under non-sinusoidal excitations (DC bias and harmonic) were conducted based on the experimental platform. Based on the Preisach model, the static hysteresis and loss properties were accurately simulated. Furthermore, an improved loss model was proposed by adjusting the statistical parameter of abnormal loss, which depends

Processing tolerance is unavoidable and easy to affect the magnetic performance consistency of magnetic release. The impact of tolerance on magnetic performance of magnetic release is researched in this paper. The main influencing factors of magnetic performance are analyzed by magnetic circuit method, including contact area between yoke and armature, yoke thickness and yoke notch size. And an orthogonal

In the wireless charging process of electric vehicles, unmanned aerial vehicles (UAVs), inspection robots and other electrical equipment, coil misalignment is inevitable due to human factors, external factors such as airflow during landing and other positioning problems, which severely limits its application. Accurate localization of the receiver coil can effectively reduce or even avoid the misalignment

Thermal design of large oil-immersed transformer is the key to guarantee its safe operation. However, the thermal design is a coupled problem including electromagnetic, oil flow and thermal performance of the transformer. Consequently, thermal design is a comprehensive multi-physics fields design process. In this paper, the comprehensive thermal analysis of the structure parts and winding area are

The harmonic interference during the operation of rolling stock or EMU is an important interference source of signal system, especially the running track circuit. The harmonic currents in the signal band exceed the limit, which will affect the reliable operation of the track circuit. Analysis of harmonic characteristics based on traction current and the principle of harmonic suppression, a method of

For the mechanical vacuum circuit breaker, the particle composition group of the metal vapor arc varies with different operating conditions, which will lead to the discontinuous variation of the electrical conductivity between electrodes. The change of mixed metal vapor arc macroscopic electrical characteristics results from the space-time change of microscopic arc plasma characteristics. For the vacuum

In order to improve the transmission performance of the wireless power transfer (WPT) system under misaligned conditions, a novel type of dual-channel DDP type transmitter coil is proposed inspired by the traditional LCC compensation circuit and DD coil. The proposed DDP coil is a combination of DD coil and P coil, which jointly establishes the main flux for magnetic coupling and power transmission

Thermoplastic composites has attracted extensive attention in industrial process with excellent properties. As one of the most important parameters, electric conductivity is difficult to detect due to its inhomogeneity and anisotropy. In this paper, a novel method for measuring volume electric conductivity of composites based on eddy current loss has been introduced by using both experimental and numerical

Accurate prediction of wind power generation is complex due to stochastic component, but can play a significant role in minimizing operating costs, and improving reliability and security of a power system. This paper proposes a hybrid deep learning model to accurately forecast the very-short-term (5-min and 10-min) wind power generation of the Boco Rock Wind Farm in Australia. The model consists of

The mathematical model of electromagnetic repulsion operating mechanism of fast vacuum transfer switch (FVTS) for 400 V/630 A/12.5 kA dual power supply system is proposed, and two-dimensional rotational symmetry model of electromagnetic field simulation is established in this paper. Taking the repulsion peak value, velocity characteristics and starting time as the design goals, through analysis and

A new HTS maglev vehicle called “KENYON” that can carry 8 passengers was successfully developed in December 2019. The vehicle adopted the bogie structure of independent running gear, which brings the improvement of curve passing performance. In order to further optimize vehicle curve passing performance in view of the small radius curve of the ring test line, corresponding experimental research was

With the merits of the excellent self-stabilization, the high-temperature superconducting (HTS) magnetic levitation (maglev) system is relatively appropriate for high-speed railway transportation. The suspension force and guidance force are mainly produced by the interaction between the HTS bulks and the permanent magnet guideway (PMG). Before the HTS bulks turn into the superconducting state, it will

Based on the evacuated tube high- T c superconducting (HTS) side-suspension (SS)-maglev circular track system which reached the maximum running speed of 160km/h, we studied the dynamical magnetic resistance of the maglev vehicle moving along the magnetic track. Different magnetic field gradients are formed by stacking silicon steel sheets on the surface of permanent magnet guideway (PMG) in this work

The tube structure is an important guarantee for the dynamic stability of the high temperature superconducting maglev-evacuated tube transport (HTS Maglev-ETT) system, it is necessary to conduct relevant research on it. Based on simulation calculations with the FLUENT software, this paper studied the influences of different tube section forms on the aerodynamic drag of maglev train in tube, as well

This article presents a novel all-superconducting propulsion and protection system for the high-temperature superconducting (HTS) Maglev. The HTS magnet is the key component in the HTS Maglev, as it is in charge of the most crucial works, the propulsion and levitation of the train, to realize the zero-friction and ultra-high-speed just above the ground. The HTS magnet can conduct massive electric current

Virtual synchronous generator (VSG) techniques are friendly applied in inverter interfaced renewable energy sources (IIRESs), and that enables to recover the rotor inertia and provide the damping support. However, the VSG generally owns weak overcurrent ability, and its transient angle stability (TAS) under faults may be destroyed. For solving the issue, This paper puts forward a coordination method

The creating of the ideal turnout switch for a highly branched Maglev system is still a challenging task, because the turnout is one of the most important and indispensable devices involved in the Maglev system. The unmovable electromagnetic turnout can easily move the Maglev vehicles running one way to another, by replacing the permanent magnets (PMs) with electromagnets. But there is still a difference

HL-2M tokamak is one of largest magnetic confinement fusion devices designed and constructed by Southwestern Institute of Physics (SWIP), China National Nuclear Corporation (CNNC), the first plasma was obtained on December, 4 th , 2020. The magnets system which plays an important role for the plasma confinement consists of 20 toroidal field (TF) coils and 18 poloidal field (PF) coils. The magnets system

The Institute of Plasma Physics Chinese Academy of Sciences (ASIPP) has announced a project to design and manufacture a high field MRI magnet with a 900 mm warm bore and comprised of Nb 3 Sn Rutherford cables in 2017. The maximum magnetic induction of magnet system is 14.3 T and magnetic field homogeneity in a spherical volume with 22 cm diameter is better than 0.5 ppm. The high performance Nb 3 Sn

The design of a 14 T MRI system was recently announced by the Institute of the Plasma Physics Chinese Academy of Sciences. Thissystem is operating at 4.5 K and 1848 A to produce a magnetic field of 14 T. Because of the high magnetic field and high working current of the system, the 14 T MRI magnet is subjected to huge electromagnetic load and mechanical load during the operational period. The preload

The High Temperature Superconducting (HTS) Conductor on Round Core (CORC) cables have been widely utilized to fabricate various superconducting applications for power transmission, fusion, and magnets with high current density. Understanding the AC loss behavior of CORC cables during the cable design process is essential for analyzing its electromagnetic performance and evaluating its future industry

The HTSConductor on Round Core (CORC) Cables have been widely recognized as the proper candidate for superconducting applications such as the high-field magnets and power transmission cables. This article presents the modeling of HTS CORC cables using the FEM H -formulation model merged into the package COMSOL Multi-physics. The 2D and 3D H -formulation models of HTS CORC cables were compared and analyzed

The parallel hybrid permanent magnet (PM) magnetic circuit used for the constant and variable magnetization state application of PM machines, possesses the disadvantages of the severe cross-coupling effect and complicated magnetic pole structure. To deal with this issue, the series hybrid PM magnetic circuit has been presented to offer a promising solution. Based on 3-D finite element analysis, the

The so-called ring-shape superconducting trapped field magnet has been proved as a potential candidate to replace commercial permanent magnets in practical industrial applications on account of its jointless structure. In this paper, a circuit method based on Bean model, E-J power law and Faraday law has been built to investigate the magnetization mechanism of ring-shape magnet. The field dependent

This paper proposes a method for saving the optimized calculating time and maximizing the energy storage density of the superconducting magnet coil. The size of the coil is taken as the optimal objective. The genetic algorithm (GA) and the traditional particle swarm optimization (PSO) are analyzed to compare with the proposed PSO. Simulation results show that the improved PSO has faster convergence

To deal with the coupling between the levitation force and torque, a new bearingless switched reluctance motor (BSRM) is presented in the paper, in which the torque flux is separated with the levitation flux. In addition, due to the low cost and power of the three-phase power converter, the radial levitation of the proposed BSRM is driven by a three-phase power converter. The structure of the proposed

For rope-less elevator applications, a novel high temperature superconducting (HTS) flux modulation linear motor (LM) using Halbach permanent magnet (PM) arrays is investigated in this paper. The flux modulation structure with iron segments can serve simultaneously and regulate the magnetic field. The HTS bulks are filled between the iron segments to further improve the flux modulation effect based

The eddy-current loss of switched reluctance motor (SRM) is studied and analyzed in this paper. As a significant part of core loss, eddy-current loss has a great influence on motor performance. First, the average magnetic flux waveforms in every distributed region are derived from the magnetic equivalent circuit (MEC) model. Based on this, each harmonic of magnetic density is obtained by adopting the

In this article, the hindrance effect of multiple-stage synchronous induction coil launcher (MSICL) during the emission procedure is analyzed. Considering the direction of the coil emission current and induced current, a new method to restrain the hindrance effect is proposed in this work, which can reduce the current operating time and increase the armature exiting speed. Based on this method, an

The hybrid magnetic bearing (HMB) with six poles possesses the characteristic of symmetrical structure. Thus, direct current and alternating current control can be selected to generate two degrees of freedom levitation forces. In this paper, Firstly, the winding connection modes and the generation mechanisms of levitation force under two control methods are analyzed, and the corresponding equivalent