2D Numerical Analysis of the Influence of Coated Conductor Structure on HTS Dynamo Characteristics
張 志宇, 寺尾 悠, 大崎 博之 （東大）
Abstract:Compared with traditional electric machines, the superconducting rotating machines have the merits of high-power density, which is considered energy-saving and cost-effective. However, the current leads loss is an obstacle to hinder the increase of machine’s efficiency. The high-Tc superconducting (HTS) flux pump or dynamo enables the injection of DC currents into the machine’s field windings without the requirement of current leads, which has been confirmed more power-saving by some groups with experimental results. However, both in experiment and simulation process, the expected linear relationship between frequency and DC output voltage becomes nonlinear under different experiment conditions and the value of transition frequency changes accordingly as well. There are no available literature explaining this phenomenon, so in this work, we attempt to investigate the influence of HTS tape’s structure on the transition frequency based on 2D numerical modeling considering H-A formulation and two different tapes provided by Shanghai Superconductor and SuperPower.