Patent ID: 8330321

Claim:
A turbogenerator comprising: a rotor and a stator, wherein the rotor comprises a cylindrical rotor body formed of at least one non-laminated, forged, and/or powder-metallurgically-produced piece and having two end sections ending at shaft ends and defining a rotor axis, and a middle section including an electromagnetically active region of the rotor; wherein the rotor body comprises a plurality of separate rotor parts joined together and arranged in series on the rotor axis; wherein the rotor body in the active region is formed of a first material which is easily magnetizable during operation of the turbogenerator, and the end sections of the rotor body located outside the active region and the shaft ends are formed of a second material with reduced magnetizability or of a non-magnetic material; and wherein the rotor end sections are at least partially outside of the stator.