Superconducting rotating machine

A superconducting rotating machine, comprising:

• a stator that includes a cylindrical stator iron core and a stator winding that is toroidally wound around the stator iron core and formed of a superconducting material, and generates a rotating magnetic field at an inner circumferential side and an outer circumferential side of the stator;
• an inner rotor rotatably held at the inner circumferential side of the stator;
• and
• an outer rotor rotatably held at the outer circumferential side of the stator,
• wherein the inner rotor and the outer rotor each include:
• at least one rotor winding selected from a superconducting squirrel cage winding including a single or a plurality of rotor bars and end rings that are formed of a superconducting material, and a normal conducting squirrel cage winding including a single or a plurality of rotor bars and end rings that are formed of a normal conducting material, and
• a rotor iron core including a plurality of slots that accommodate the respective rotor bars of the rotor winding.