LAUSR

In this study, we propose a numerical method to estimate the AC loss of a 30-kW HTS synchronous generator during rated operation. As HTS armature windings are installed around the stator core in a rotating machine, it is a troublesome task to calculate the AC loss accurately in such a time-varying electromagnetic field. Additionally, the nonlinear E-J characteristics and high aspect ratio of superconducting tapes make the total work more difficult and time-consuming. To address these problems, we apply appropriate boundary conditions to connect two submodels, one for the rotating machine and the other for superconducting materials, to calculate the magnetic field and actual current distributions on the HTS armature windings. In addition, the AC loss per turn of an HTS armature winding is simulated for comparison, and it should be noted that the size of the boundary has an influence on the AC loss estimation. The closer the boundary is to the superconducting material, the more reliable the result. AC loss estimation on HTS armature windings in a machine is an inevitable and meaningful issue during a preliminary design. This study could offer an indispensable reference for this issue.