| 主权项 |
1. A direct-drive electric generator with superconducting coils for a wind turbine, the generator (3) comprising
a stator assembly (5, 8, 9, 11, 12) comprising air-gap stator windings (11), an air-gap windings frame (12), an annular stator back yoke (8) and a stator frame (9); a rotor assembly (2, 6, 7, 14) rotatable within the stator assembly (5, 8, 9, 11, 12), wherein the rotor assembly comprises a rotor back iron (7) with protruding iron poles (6) there-from; a plurality of superconducting coils (24) positioned on the rotor assembly (2, 6, 7, 14); a cooling system (15, 16, 17, 18) comprising a compressor (15), a feedthrough (16), transmission lines (17) and cryocooler cold-heads (18) for cooling the superconducting coils (24) down to a suitable cryogenic temperature; the cold heads (18) being connected through the lines (17) to the compressor such that coolant can be delivered and recovered from the cold heads (18); and a modular cryostat (10) comprising a plurality of cryostat modules, wherein each cryostat module houses a superconducting coil (24) for optimal thermal insulation of the same (24), wherein the modular cryostat (10) is adapted to rotate synchronously with the rotor and is positioned on the outer surface of the rotor back iron (7), has a round-ladder like geometry comprising a plurality of central openings adapted to host the protruding rotor iron poles, is free of cooling fluid and is adapted to keep the cryogenic temperatures by means of connections to the plurality of cold heads (18) through heat transmission circuits (45, 46). |
