Critical Current Simulation and Measurement of Second Generation, High-Temperature Superconducting Coil under External Magnetic Field

Yu, Dongmin; Liu, Huanan; Zhang, Xinhe; Gong, Taorong

doi:10.3390/ma11030339

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…at >5 T) and 4.2 K, a B − α dependence seems to be insufficient for a description of the experimental data (see dashed curve in figure 7) at 77 K and a broader field range: it fits only below 1 T [17,18]. Some earlier attempts [19][20][21] to propose 'universal' approximations at low and medium fields, did not result in a sufficient, wide-field 'tool' for I c (B) modeling. The most successful physical models (e.g.…”

Section: Critical Current Nand α-Valuesmentioning

confidence: 93%

Current–voltage characteristics of double disordered REBCO coated conductors exposed to magnetic fields with edge gradients

Gnilsen

Usoskin

Eisterer

et al. 2019

Supercond. Sci. Technol.

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A study of HTS-coated tapes which are exposed to a low and medium field with a gradient in the flux density is performed in order to enable relevant and accurate tape characterization as well as to determine the relevant information for applications, where a magnetic field gradient occurs. In particular, the study is focused on ultra-high-magnet-field YBCO-coated tapes. Such tapes based on double disordered YBCO layer with intrinsic and extrinsic precipitations exhibit a ‘champion’ performance in ultra-high (31 T) magnetic fields. Alternative measurement techniques, based on miniature permanent magnets or a pulsed electro-magnet was developed to characterize the critical current, I c , in 0.5 and 3 T fields at 77 K, B//c, respectively. For the field dependence of the critical current, an ‘extended alpha approximation’ is suggested, which enables a sufficiently accurate description of the tape behavior in the low and medium field range, i.e. from 0 to 6 T. Local and integral voltage response in the tapes are analyzed and compared with experimental results. Observations of the effect that gains the influence of local I c -inhomogeneities exposed to a spatially confined magnetic field are described and discussed. The effects of local heating and cooling are shown to be limited via lowering the transport currents and finally a reduced power dissipation in the tape exposed to a localized magnetic field with two gradient zones was demonstrated. Correction factors needed to determine the critical current from the field dependence of the integral voltage response are derived and discussed.

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Section: Critical Current Nand α-Valuesmentioning

confidence: 93%

Current–voltage characteristics of double disordered REBCO coated conductors exposed to magnetic fields with edge gradients

Gnilsen

Usoskin

Eisterer

et al. 2019

Supercond. Sci. Technol.

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“…A FEM model of superconducting coil considering E-J power law and Kim law is established in Comsol based on H formulation and the magnetic field distribution in the superconducting region is calculated [22,23], which is shown in Figure 9. The maximum magnetic density in the superconducting region is about 2.6 T. The maximum magnetic density in the superconducting region is about 2.6 T. Under this magnetic field condition, it is possible to realize a currentcarrying capacity of 400 A for 10 mm width high-performance superconducting strips at about 50 K.…”

Section: Design Of a Superconducting Magnetic Eddy Current Heatermentioning

confidence: 99%

Application and analysis of superconducting magnetic eddy current heater used in wind thermal power generation system

Zhang,

Chen,

Liu

et al. 2024

IET Electric Power Appl

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In order to cope with the grid fluctuation caused by large‐scale wind power connected to the grid, the wind thermal power generation system has been proposed and extensively studied. The wind thermal power generation system uses a wind turbine to drive a heat generation device to heat the heat storage medium, which is further exchanged to drive a turbine to generate electricity. A superconducting magnetic eddy current heater (SMH) is proposed for the characteristics of wind thermal power generation system, which uses non‐resistive, large current‐carrying superconducting coils for excitation, and has high output efficiency and power density. The working principle of magnetic eddy current heating is analysed, and the structure of SMH with no ferromagnetic material and two heating screens inside and outside is proposed according to the characteristics of SMH. An analytical model of the SMH is established, and the influence of the structure and materials of the SMH on the magnetic field distribution is analysed. Based on this, a 22‐pole SMH was designed and analysed for output power at 10–20 rpm. A three‐dimensional magnetism‐stress combined analysis model of SMH is established, and the strain and stress characteristics of SMH are simulated under the condition of maximum output power, which verifies the feasibility of the mechanical properties of existing superconducting materials for application in SMH.

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“…The main technological applications range from superconducting fault current limiter for use in electric power system to wireless power transfer for use in electric vehicle. A plethora of features have been investigated such as transport current and magnetization losses [12,13]; charging, discharging and overcurrent [14][15][16]; turn-to-turn contact resistance [17]; interfacial stress and critical current degradation [18,19]; axial levitation force [20]; bifilar coil and transformer magnetic shield for superconducting fault current limiter [21,22]. Although there are many works on the subject, the study on the nonlinearity of the inductance is scarce.…”

Section: Introductionmentioning

confidence: 99%

Superconducting pancake coil FEM analysis for very low frequency levitated gravity accelerometers

Paula¹,

Moody²,

Norton³

et al. 2022

Supercond. Sci. Technol.

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State-of-the-art detectors are necessary to measure very tiny variations of gravity produced by spiraling neutron stars, merging black holes, moving tectonic plates. We are developing a superconducting gravity gradiometer and aim to achieve 0.1 mE Hz^{-1/2} in the frequency band of 0.1 mHz to 0.1 Hz. The superconducting test masses are levitated by a superconducting current-carrying monolayer pancake coil, which is one of the key components of the instrument. However, the nonlinear aspect of the magnetic field trapped between the test mass and the pancake coil imposes one of the main constraints to achieve that such low frequencies. In this paper, we investigated the causes of that nonlinearity by finite element method using COMSOL Multiphysics® simulation software. First, inductances were measured with an experimental setup where a gap spacing, created by a pancake coil and a niobium plate, could be adjustable. The inductances computed with a 2D axis-symmetric model satisfactorily agreed to the experimental data. Finally, we extensively studied several mechanisms for cancelling the nonlinearity of the inductance. A solenoid next to the pancake coil is the most effective and practical way to mitigate it. Furthermore, our approach can also be useful for those seeking a simple and effective model to study magnetostatic problems in a superconductor

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Critical Current Simulation and Measurement of Second Generation, High-Temperature Superconducting Coil under External Magnetic Field

Cited by 9 publications

References 23 publications

Current–voltage characteristics of double disordered REBCO coated conductors exposed to magnetic fields with edge gradients

Current–voltage characteristics of double disordered REBCO coated conductors exposed to magnetic fields with edge gradients

Application and analysis of superconducting magnetic eddy current heater used in wind thermal power generation system

Superconducting pancake coil FEM analysis for very low frequency levitated gravity accelerometers

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