The Difficulty of Modeling Ripple Field Losses in Superconductors Using the Eddy Current Model

被引：23
作者：
Lahtinen, Valtteri [1 ]
Stenvall, Antti [1 ]
机构：
[1] Tampere Univ Technol, FIN-33101 Tampere, Finland
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2013年 / 23卷 / 03期
基金：
芬兰科学院;
关键词：
AC losses; eddy current model; ripple fields; superconducting motors; AC LOSS;
D O I：
10.1109/TASC.2012.2233842
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The eddy current (EC) model is a widely used tool for simulating hysteresis losses in superconductors. It is a reliable way to estimate losses in 50 Hz transport current, applied field or AC-AC cases. However, in some applications, such as synchronous electric motors with superconducting field windings, a small multifrequency external magnetic field is present while a superconducting coil carries a DC current. In such cases, the use of the EC model becomes challenging. In this paper, we investigate the challenges confronted in such cases by using the EC model in their simulation. It is observed that the EC model using the power law resistivity leads to current density profile homogenization even when no changes happen in the driving quantities. Also, modeling uncoupled cases in which a DC bias current flows in the conductor is troublesome.
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