Rotor with superconducting rotor winding and the rotor winding surrounding uniform shell

A rotor (3) for an electrical machine (1), in particular a synchronous machine (1) has a rotor axis (6) which defines a rotor shaft (4). The rotor (3) has a winding carrier (7), rotationally fixed on the rotor shaft (4) is arranged so as the rotor shaft (4), relative to the rotor axis (6), in a central portion surrounding (8). The winding support (7) carries a superconducting rotor winding (9). The rotor (3) has a casing (10) which, relative to the rotor axis (6), the winding support (7) and the rotor winding (9) surrounds at least radially. The sheath (10) consists at least in the region (10 ') in which it encloses the winding support (7) and the superconducting rotor winding (9) extending radially, uniformly from a metal alloy which is non-magnetic, at 20 ° C, an electrical conductivity of at least 60% of the electrical conductivity of copper, at 200 ° C, a mechanical tensile strength of at least 250 N / mm