Abstract
AC losses in superconductors are essential for the design of cooling system for large scale power applications. Magnesium diboride (MgB2 ) superconducting wires have been investigated and manufactured over the last decade due to cheap raw materials and flexibility for coil design. In addition, multifilamentary MgB2 wires have been manufactured to reduce ac losses. In this paper, self-field ac losses of multifilamentary MgB2 wires with magnetic barrier are investigated using both experimental and numerical methods. A short straight wire sample and a coil sample are tested under various temperatures and frequencies between 16-and 128-Hz. The test results show that the transportation loss is independent of the operating temperature. On basis of both theoretical and numerical study, it is found that hysteresis loss in superconductor accounts only for a small fraction of the transportation losses, ferromagnetic hysteresis loss in the magnetic barrier dominates when the transport current is low, whereas eddy current loss dominates when the transport current is close to the critical current.
Original language | English |
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Article number | 8201205 |
Number of pages | 5 |
Journal | IEEE Transactions on Applied Superconductivity |
Volume | 29 |
Issue number | 5 |
Early online date | 8 Mar 2019 |
DOIs | |
Publication status | Published - 31 Aug 2019 |
Funding
Manuscript received October 25, 2018; accepted February 27, 2019. Date of publication March 8, 2019; date of current version April 1, 2019. This work was funded as part of the UK EPSRC, Developing Superconducting Fault Current Limiters (SFCLs) for Distributed Electric Propulsion Aircraft: EP/S000720/1. (Corresponding author: Xiaoze Pei.) J. Xi and X. Pei are with the Department of Electronic and Electrical Engineering, University of Bath, Bath, BA2 7AY, U.K. (e-mail:,[email protected]; [email protected]).
Keywords
- AC losses
- eddy current loss
- ferromagnetic loss
- hysteresis loss
- magnesium diboride (MgB2)
- multifilamentary superconductor