2D Modeling of HTS Coils with $T$-$A$ Formulation: How to Handle Different Coupling Scenarios
Bárbara Maria Oliveira Santos, Gabriel Dos Santos, Frédéric Sirois, Roberto Brambilla, Rubens de Andrade Junior, Felipe Sass, Guilherme Goncalves Sotelo, Francesco Grilli
Numerical models based on the finite-element method (FEM) are popular tools for investigating the macroscopic electromagnetic behavior of high-temperature superconductor (HTS) applications. This article explains how to use the $T$-$A$ formulation for modeling HTS coils in 2D with different coupling scenarios between the turns. First we consider a racetrack coil wound from one piece of superconducting tape. Then we consider a coil obtained by winding a cable composed of different HTS tapes. In the latter case, the tape turns are either electrically connected along their entire length or just at the two ends of the coil: in the model, these two different types of electrical connection are implemented with the help of the electrical circuit module. The current density distributions and the AC losses of the coils in the different coupling scenarios are compared and discussed. The limits of applicability of the presented approach are pointed out. The model is developed for the straight section of racetrack coils, but can be easily adapted to axisymmetric geometries.
Simulation of Stacks of High Temperature Superconducting Coated Conductors Magnetized by Pulsed Field Magnetization Using Controlled Magnetic Density Distribution Coils
Local electromagnetic properties and hysteresis losses in Non-Uniformly wound 2G-HTS Racetrack Coils
一个值得注意的物理依赖性的磁滞损耗与轴向绕组的商业\textcolor{black}{Second Generation High Temperature Superconducting (2G-HTS)}磁带的超导跑道线圈的错位的报告。全面研究了匝间不对准因子对单个匝的局部电磁特性的影响，考虑了六种不同的线圈布置和十个施加的交变传输电流$I_{a}$的振幅，以及实验确定的临界电流密度$J_{c}(B,θ)$的磁角各向异性特性的函数。已经发现，对于中等到低的施加电流$I_{a} \leq 0.6~I_{c0}$，其中$I_{c0}$是各个带的自场临界电流，在极端绕组变形下所产生的滞后损耗可以导致能量损耗的增加高达由完美缠绕的线圈产生的损耗的$25\%$。高层次的网格的考虑已被应用，以获得一个现实的帐户的局部和全局的电磁性能的跑道线圈，…我们的研究结果可以作为一个实际的基准，以确定任何2G-HTS赛道线圈应用的相对损耗，揭示可能的线圈绕组错位可以推断的物理指纹。
Explicit Turn Resolution with Anisotropic Homogenisation for Efficient 3D Magneto-Thermal Finite-Element Simulation of Large-Scale No-Insulation HTS Magnets
