Patent ID: 7049717

Claim:
A machine device including a closed pipeline system, comprising: a rotor, mounted to rotate about a rotation axis, with at least one superconducting winding formed of conductors coupled in a thermally conductive manner to a rotor cavity, having a substantially cylindrical shape, located centrally within said rotor and extending in an axial direction to the closed pipeline system to receive a refrigerant circulating by a thermosiphon effect, where liquid refrigerant passes into the rotor cavity at an entry end, and gaseous refrigerant emerges from the rotor cavity, the rotor cavity having at least one of a helical and a spiral feed path running from the entry end of the refrigerant into the rotor cavity axially toward an opposite end; and rotating means for rotating said rotor in a non-operating state to feed the liquid refrigerant from an entry end to an opposed end of the rotor cavity in the non-operative state.