A modified model to estimate the screening current-induced magnetic field of a REBCO magnet

Tang, Yunkai; Liu, Donghui; Li, Dongke; Yong, Huadong; Zhou, Youhe

doi:10.1088/1361-6668/ac4c85

Cited by 6 publications

(2 citation statements)

References 47 publications

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“…The schematic view and equivalent circuit model are shown in figure 1, and the serial number of each turn is defined according to the direction of the transport current. In each independent circuit network, the governing equation is obtained by Kirchhoff's voltage law [34,[44][45][46]: where the subscripts k (1 ⩽ k ⩽ 152) and j (1 ⩽ j ⩽ 133) both represent the turn number. M j,k is the mutual inductance between the jth and kth turns when j and k are not equal, and the self-inductance of the jth turn when subscripts j and k are equal.…”

Section: Numerical Model Descriptionmentioning

confidence: 99%

Numerical analysis of the contact resistance in a no-insulation layer-wound coil with a simplified electromagnetic–mechanical model

Li¹,

Tang²,

Liu³

et al. 2022

Supercond. Sci. Technol.

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The increase in contact resistance of no-insulation (NI) high-temperature superconducting (HTS) coil was observed in the high-field test, which may be related to the mechanical deformation and the separation between adjacent turns in the coil. The large electromagnetic force generated in the high magnetic field can cause the separation between adjacent turns of the NI coil, which can affect the contact resistance of the magnet. An electromagnetic-mechanical model is built to study the effect of separation on the contact resistance and field delay time of an NI layer-wound coil. The numerical results show that the large electromagnetic force generated in the high field leads to the local separation between adjacent turns and the increase of contact resistance of the NI layer-wound coil. Moreover, a higher external field or target current can result in a larger area of separation region, a higher contact resistance and a shorter characteristic field delay time. The overband can restraint the mechanical deformation and separation between turns of the NI coil in the high field, which suppresses the increase of turn-to-turn contact resistance.

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Section: Numerical Model Descriptionmentioning

confidence: 99%

Numerical analysis of the contact resistance in a no-insulation layer-wound coil with a simplified electromagnetic–mechanical model

Li¹,

Tang²,

Liu³

et al. 2022

Supercond. Sci. Technol.

Self Cite

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“…The cables and coils are the important components of these HTS devices, which are used for electrical power transmission or to generate a high magnetic field. Thus, it is vital to calculate their electromagnetic responses during the operation [10][11][12][13][14][15]. The heat generated in HTS is related to the alternate current (AC) losses [13].…”

Section: Introductionmentioning

confidence: 99%

Calculations of the AC losses in superconducting cables and coils: Neumann boundary conditions of the T–A formulation

Wang¹,

Yong²,

Zhou³

2022

Supercond. Sci. Technol.

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Numerical techniques play an important role in the design of high-temperature superconductor (HTS) systems. In the superconductivity community, the T–A formulation of Maxwell’s equations and its homogeneous technique have become popular in recent years. The T–A formulation has the capability of simulating HTS systems and high computational efficiency. However, it is still difficult for the T–A formulation to solve some special problems. For instance, the net current is not explicitly known in each HTS tape. In the present work, the contributions of the Neumann boundary condition are studied, which represent a coupling effect between the T and the A formulations. This paper firstly describes the Neumann boundary condition in detail. Then, based on the T–A formulation and its Neumann boundary condition, the non-uniform current distribution in the cables and the current decay in the closed-loop coils are respectively analyzed. This method can solve the difficulties of the T–A formulation in calculating some specific problems, and extend the application range of the T–A formulation. Furthermore, the above supplement is also applicable to the homogeneous and the three-dimensional (3D) models.

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A modified J model for efficiently calculating the electromagnetic fields of ReBCO no-insulation pancake coils using an explicit–implicit hybrid algorithm

Tang,

Liu,

Shan

et al. 2024

Cryogenics

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A modified model to estimate the screening current-induced magnetic field of a REBCO magnet

Cited by 6 publications

References 47 publications

Numerical analysis of the contact resistance in a no-insulation layer-wound coil with a simplified electromagnetic–mechanical model

Numerical analysis of the contact resistance in a no-insulation layer-wound coil with a simplified electromagnetic–mechanical model

Calculations of the AC losses in superconducting cables and coils: Neumann boundary conditions of the T–A formulation

A modified J model for efficiently calculating the electromagnetic fields of ReBCO no-insulation pancake coils using an explicit–implicit hybrid algorithm

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