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Direct current (DC) characterization of high temperature superconducting(HTS) coils is important for HTS applications, such as electric machines,superconducting magnetic energy storage (SMES) and transformers. In this paper,DC characterization of a circular, epoxy-impregnated HTS coil made from YBCOcoated conductor for use as a prototype axial flux HTS electric machine ispresented. Multiple voltage taps were utilized within the coil duringmeasurement to help provide further detailed information on its DC behavior asa function of length. Based on the experimental results, there exist regions ofnon-uniformity along the length of superconductor in the coil, resulting innon-ideal superconducting properties of the coil. By studying thecurrent-voltage (I-V) curves across different regions, it is found that adecreasing n-value and critical current exists in the non-uniform parts of theHTS coil.

DC Characterization of a Circular, Epoxy-Impregnated High Temperature Superconducting (HTS) Coil