Development of a YBCO Racetrack Coil for HTS Machine Applications

A YBCO racetrack coil was developed for HTS machine applications. The coil was constructed as step-type to fit in the limited space of the machine rotor. Two double-pancake (DB) windings were fabricated for the whole coil that has used 388 m of YBCO wires purchased from American Superconductor Corporation (AMSC). A finite-element method (FEM) software was used to model the coil and the critical currents for each DB winding were estimated. It was found out during the winding process that by using AMSC wires the coils can be wound in a rather simple way. The coils show no degradation even after a few accidents occurred during the winding process.