Patent ID: 8242657

Claim:
A superconductive rotor disposed to be rotated in a stator for generating a rotating magnetic field, comprising: a superconductive squirrel-cage winding formed by rotor bars and end rings, the rotor bars including one or more superconductive wires having a plurality of superconductive wires covered with a highly conductive metal; a normally conductive squirrel-cage winding formed by rotor bars and end rings, which are made of a normally conductive material; a cylindrical rotor core having a plurality of slots for accommodating the rotor bars of both of the squirrel-cage windings; and a rotor shaft coaxially provided to the rotor core, wherein, when the superconductive squirrel-cage winding is in a non-superconductive state, rotations are mainly made by an induced torque generated on the normally conductive squirrel-cage winding due to a rotating magnetic field and, when the superconductive squirrel-cage winding is in a superconductive state, rotations are mainly made by a synchronous torque generated by the superconductive squirrel-cage winding trapping magnetic flux of the rotating magnetic field.