Comparison of 2D simulation models to estimate the critical current of a coated superconducting coil

Yingzhen Liu, Jing Ou, Francesco Grilli, Fabian Schreiner, Victor Manuel Rodriguez Zermeno, Min Zhang, Mathias Noe

Research output: Contribution to journalArticle

10 Citations (Scopus)
21 Downloads (Pure)

Abstract

Superconductors have been being applied to a variety of large-scale power applications, including magnets, electric machines, and fault current limiters, because they can enable a compact, lightweight and high efficiency design. In applications such as those mentioned above, superconducting coils are always a key component. For example, in a superconducting electric machine, the superconducting coils are used to generate the main flux density in the air gap, which is significantly important for the energy conversion. It is the performance of the superconducting coils that plays an essential role in determining the performance of the device. However, the performance of a superconducting coil is limited by its critical current, which is determined by temperature and the magnitude and orientation of the magnetic field inside the superconductors. Hence, in-depth investigations to estimate the critical current of the superconducting coils are necessary before manufacturing. Available transient simulation models to estimate the critical current are through the H- and T-A formulations of Maxwell's equations. Both methods consider the same current ramp-up process occurring in experiments. Besides these transient models, static simulations can also be used: a modified load-line method and the so-called P-model, which is based on the asymptotic limit of Faraday's equation when time approaches infinity. To find the best way to calculate the critical current, the four methods are used to estimate the critical current of a double pancake superconducting coils and results are compared with experiments. As a conclusion, T-A formulation, P-model, and the modified load-line methods are recommended for estimating the critical current of the superconducting coils.

Original languageEnglish
Article number014001
Number of pages12
JournalSuperconductor Science and Technology
Volume32
Issue number1
Early online date28 Nov 2018
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • 2D numerical model
  • critical current
  • N-value
  • superconducting coil
  • tape anisotropy

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