Patent ID: 7272938

Claim:
A superconducting device comprising: a rotor which is mounted to rotate about a rotation axis extending in an axial direction, the rotor comprising: a thermally conductive winding mount; a cylindrical, central cavity which extends in the axial direction, the central cavity being connected to a lateral cavity which rotates with the rotor and which leads out of the winding mount; and a superconducting winding having conductors arranged in the winding mount; and a refrigeration unit having a cold head which is thermally coupled to the winding mount, the refrigeration unit being located outside the rotor such that the rotor rotates with respect to the refrigeration unit, the refrigeration unit having a condenser unit to condense a refrigerant; and a stationary heat pipe coupled to the condenser unit, which heat pipe projects axially into the lateral cavity and is radially sealed to the lateral cavity, wherein the heat pipe, the lateral cavity and the central cavity are filled with the refrigerant, with condensed refrigerant being passed through a thermosyphon effect to the central cavity via the heat pipe and the lateral cavity, and with vaporized refrigerant being passed from the central cavity to the consenser unit via the lateral cavity and the heat pipe, and the refrigerant is a mixture of at least two refrigerant components with different condensation temperatures.