Degradation of critical current (Ic) in a high-temperature superconducting (HTS) tape under bending conditions had been previously investigated. These investigations were focused on only either bending or torsion. A rotating flux pump is used to study the charging characteristics of an HTS synchronous motor. In order to design the rotating flux pump connected in series, the elliptical winding applied together with combined bending and torsion is essential. Therefore, in this paper, the critical current considering curvature of elliptical shape is measured with regard to nine kinds of mandrels. The shapes of the mandrels are a tall prolate ellipsoid, oblate ellipsoid, and semicircle. The diameters of each shape are 20, 30, and 40 mm, respectively. The experiments are mainly composed of three conditions: straight, bending, and combined bending and torsion. Finally, the experimental observations have been compared with the theoretical predictions.
Bibliographical noteFunding Information:
Manuscript received August 28, 2017; accepted November 27, 2017. Date of publication December 11, 2017; date of current version January 19, 2018. This work was supported in part by the National Research Foundation of Korea grant funded by the Korea government (MSIP), and in part by “Human Resources Program in Energy Technology” of Korea Institute of Energy Technology Evaluation and Planning, granted financial resource from the Ministry of Trade, Industry, and Energy, Republic of Korea, under Grants 2016R1A2B4007324 and 20164030201100. (Corresponding author: Yong Soo Yoon.) S. Han, J. Lee, H. Jeon, and T. K. Ko are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 30722, South Korea.
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering