Superconducting field winding assemblage for an electrical machine

A field winding assemblage for an electrical machine, said field winding assemblage comprising a plurality of pole assemblies each including:

• a) a direction of motion;
• b) a solid core;
• c) a superconductive coil assembly generally surrounding said solid core and having a generally longitudinally extending axis disposed generally perpendicular to said direction of motion, an epoxy-impregnated, generally racetrack-shaped superconductive coil having a minor axis disposed generally parallel to said direction of motion, a thermal shield generally surrounding and spaced apart from said superconductive coil, and a vacuum enclosure surrounding and spaced apart from said thermal shield;
• d) a single-loop, generally racetrack-shaped, first cooling conduit generally coaxially aligned with said longitudinally extending axis, generally concentric with said superconductive coil, containing a gaseous cryogen, and disposed in thermal contact with said superconductive coil;
• and
• e) a single-loop, generally racetrack-shaped, second cooling conduit generally coaxially aligned with said longitudinally extending axis, generally concentric with said superconductive coil, containing a gaseous cryogen, and disposed in thermal contact with said thermal shield.