Superconducting device with a cooling unit for cooling a rotating superconducting winding

The supraconductor device (2) contains a rotor (5), which can rotate about a rotational axis (A), with a supraconductive coil (10) in a heat conducting coil support (9). The coil support (9) comprises a central cylindrical cavity (12). A cooling head (16), which is located outside of the rotor (5), of a cooling unit is connected in a heat conductive manner to a heat transfer body (18), which projects into the cavity (12) of the coil support (9) while remaining stationary. An annular gap (19) located between the coil support (9) and the heat transfer body (18) is filled with a heat conducting contact gas (21).