Numerical Evaluation of Pulsed Field Magnetization in a Bulk Superconductor Using Energy Minimization Technique

Komori, Kazuhiro; Yokoo, Ryuya; Tomachi, Kyohei; Enpuku, Keiji; Funaki, K.; Hayashi, H.; Fujishiro, Hiroyuki

doi:10.1109/tasc.2008.920532

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…The geometry of finite cylinders is more realistic to model bulk samples but it requires numerical computations. The process of the current and flux penetration has been studied for the critical state model [187] and for a power-law E(J) relation [188]. The latter work also takes into account the selfheating effects caused by the changing magnetic field.…”

Section: ) Rotating Fieldsmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

314

272

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Numerical modeling of superconductors is widely recognized as a powerful tool for interpreting experimental results, understanding physical mechanisms and predicting the performance of high-temperature superconductor (HTS) tapes, wires and devices. This is especially true for ac loss calculation, since a sufficiently low ac loss value is imperative to make these materials attractive for commercialization. In recent years, a large variety of numerical models, based on different techniques and implementations, have been proposed by researchers around the world, with the purpose of being able to estimate ac losses in HTSs quickly and accurately. This article presents a literature review of the methods for computing ac losses in HTS tapes, wires and devices. Technical superconductors have a relatively complex geometry (filaments, which might be twisted or transposed, or layers) and consist of different materials. As a result, different loss contributions exist. In this paper, we describe the ways of computing such loss contributions, which include hysteresis losses, eddy current losses, coupling losses, and losses in ferromagnetic materials. We also provide an estimation of the losses occurring in a variety of power applications.

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Section: ) Rotating Fieldsmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

314

272

View full text Add to dashboard Cite

show abstract

“…However, analytic and semi-analytic methods are still of interest to address this problem as they considerably simplify the mathematical procedures, leading to a significant reduction in the computational effort [4]. General techniques have been developed over the years [5][6][7][8][9][10] which have been found to be useful in many different fields including eddy-current tomography [11], planar PCB inductors [12], coreless printed circuit board transformers [13], force and torque calculation [14,15], electromagnetic launchers [16], plasma science [17], and superconducting magnetic levitation [18]. Still, the methods presented in these works are finally based on a numerical computation [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Accurate Computation of Mutual Inductance of Non Coaxial Pancake Coils

et al. 2021

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The computation of self and mutual inductances of coils is a classic problem of electrical engineering. The accurate modeling of coupled coils has received renewed interest with the spread of wireless power transfer systems. This problem has been quite well addressed for coplanar or perfectly coaxial coils but it is known that the misalignment conditions easily lead to a sharp decrease in the efficiency. Hence, it is crucial to take misalignment into account in order to properly design the overall wireless power transfer system. This work presents a study to compute analytically the mutual inductance of non-coaxial pancake coils with parallel axes. The accuracy of the proposed methodology is tested by comparison with the numerical results obtained using the tool Fast-Henry. Then, a wireless power transfer system, comprising a full bridge inverter is considered, showing the impact of the misalignment on the coupling between two pancake coils and, thus, between the source and the load.

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“…T HERE are two major processes for the magnetization of bulk superconductor materials, the field cooling method [1] that requires a large system to supply a stable magnetic field [2] and the pulsed field magnetization (PFM) method [3]. This latter technique uses a simple cooper coil to apply pulsed magnetic field because joule loss in the cooper coil is small [1].…”

Section: Introductionmentioning

confidence: 99%

“…These currents prevent penetration of the magnetic fluxes in the material and influence-trapped magnetic field properties. Therefore, it is necessary to study and develop a precise magnetization method [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Trapped Magnetic Field During Magnetization Process by Using SPA Method of Bulk Superconductor

et al. 2015

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Numerical Evaluation of Pulsed Field Magnetization in a Bulk Superconductor Using Energy Minimization Technique

Cited by 7 publications

References 13 publications

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Accurate Computation of Mutual Inductance of Non Coaxial Pancake Coils

Analysis of Trapped Magnetic Field During Magnetization Process by Using SPA Method of Bulk Superconductor

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