3D finite element analysis of eddy current loss of HTS tapes – External field analysis

The eddy current losses in the matrix of two twisted filaments Bi-2223 HTS tapes in applied external AC magnetic field was calculated using 3D FEM software. The highest eddy current loss in the matrix was experienced when magnetic field is applied perpendicular to the wide side of the rectangular model. Numerically calculated eddy current losses are plotted as the function of frequency, filament twist pitch, matrix conductivity and magnetic field amplitude. Longer filament twist pitch models have higher eddy current losses in transverse magnetic field. In longitudinal magnetic field shorter filament twist pitch have higher eddy current losses. Increases in the applied external field amplitude, frequency and matrix conductivity contributes to higher eddy current losses. Numerical calculation results shows that the contribution of eddy current loss at commercial frequency is not minimal. The numerical results presented are for uncoupled filaments HTS tapes.