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Transport AC Loss Measurements of a Triangular, Epoxy-Impregnated High Temperature Superconducting (HTS) Coil

Accepted version
Peer-reviewed

Type

Article

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Authors

Ainslie, MD 
Hu, D 
Kvitkovic, J 
Kim, J 
Kim, C 

Abstract

In this paper, the transport AC losses in a triangular, epoxy-impregnated high temperature superconducting (HTS) coil made from YBCO coated conductor, intended for use in a prototype axial flux HTS electric machine, are measured using two different electrical techniques at 77 K. The first set of AC loss measurements of the coil are carried out at the University of Cambridge using a technique based on a lock-in amplifier. The coil is then measured at the Center for Advanced Power Systems (CAPS), Florida State University, using a technique based on a high accuracy data acquisition (DAQ) measurement system. The two different methods show consistent results, validating the accuracy of these two techniques for transport AC loss measurements of superconducting coils. Multiple voltage taps are utilized within the coil to study the details and distribution of the AC loss in different sections of the coil. Losses are also measured with a flux diverter made of ferromagnetic material to analyze its effect on the AC losses.

Description

Keywords

AC loss, critical current density (superconductivity), high-temperature superconductors, superconducting oils, transport ac loss

Journal Title

IEEE Transactions on Applied Superconductivity

Conference Name

Journal ISSN

1051-8223
1558-2515

Volume Title

27

Publisher

Institute of Electrical and Electronics Engineers
Sponsorship
Royal Academy of Engineering (RAEng) (10216/113)
EPSRC (1355873)
The work of D. Hu was supported by Churchill College, the China Scholarship Council, and the Cambridge Commonwealth, European and International Trust. The work of M. D. Ainslie was supported by a Royal Academy of Engineering Research Fellowship.