| 摘要 |
1,134,327. Dynamo-electric machines having superconducting windings. SIEMENS-SCHUCKERTWERKE A.G. 3 Feb., 1966 [6 Feb., 1965], No. 4889/66. Heading H2A. The superconducting winding 2 of the rotor 1 of a dynamo-electric machine, e.g. synchronous turbo-generator is held in place by ties 6, and centrifugal forces acting on the winding during operation of the machine are compensated for by magnetic forces between the rotor iron and the winding, resulting from the medium in the slot between the winding and the rotor periphery being non-magnetic. The winding 2 is a 2- or 4-pole exciter winding of superconducting wire in a Cu U-shaped bar 21 in 2-part good heat-conducting supporting bodies 3 around which are wound cooling coils 20 which convey cooling liquid; alternatively, coolant may pass through the bodies 3. Surrounding the coils is pressure-sensitive heatinsulation 5, e.g. crinkled foils disposed in slot bars 4 of which the radially outer and inner parts 19, 18 are respectively non-magnetic and of high saturation induction, e.g. cobaltiron whereby excitation of the winding creates magnetic forces which act radially inwards to provide the compensation. The ties 6 may be secured to the rotor laminated iron at the centre, and accelerating and gravitational forces may be taken up by further ties 23 of nylon filament or stainless steel bar and by distance pieces 39. In other embodiments, Figs. 5 ... 7 (not shown), the ties instead of being radial are disposed polygonally around the axis. The coolant is supplied to and discharged from fixed pipes through labyrinth packings (29, 30), Fig. 8, to concentric shaft cavities 27, 28 having crinkled foil heat insulation 31 and through which pass cables 34, 35 to slip rings 32, 32 cooled by interruption of the heat insulation. The rotor may have a damping winding, and the excitation may be dependent upon the machine speed or the tensile force of the ties and may embody a voltage regulator. |
