AC loss of HTS magnet for AMR refrigerator using magnetic field formulation and edge element in cylindrical coordinates

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AMR (Active Magnetic Regenerative) refrigerators require the large variation of the magnetic field and a HTS magnet can be used. The amount of AC loss is very important considering the overall efficiency of the AMR refrigerator. However, it is very hard to estimate the precise loss of the HTS magnet because the magnetic field distribution around the conductor itself depends on the coil configuration and the neighboring HTS wires interact each other through the distorted magnetic field by the screening current Therefore, the AC loss of HTS magnet should be calculated using the whole configuration of the HTS magnet with superconducting characteristic. This paper describes the AC loss of the HTS magnet by an appropriate FEM approach, which uses the non-linear characteristic of HTS conductor. The analysis model is based on the 2-D FEM model, called as 'magnetic field formulation and edge-element model', for whole coil configuration in cylindrical coordinates. The effects of transport current and stacked conductors on the AC loss are investigated considering the field-dependent critical current. The PDE model of 'Comsol multiphysics' is used for the FEM analysis with properly implemented equations for axisymmetric model.
Publisher
Korea Institute of Applied Superconductivity and Cryogenics
Issue Date
2013
Language
English
Citation

JOURNAL OF THE KOREA INSTITUTE OF APPLIED SUPERCONDUCTIVITY AND CRYOGENICS, v.15, no.1, pp.29 - 34

ISSN
1229-3008
URI
http://hdl.handle.net/10203/189880
Appears in Collection
ME-Journal Papers(저널논문)
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