Abstract: An apparatus and method are provided for thermally balancing the rotor of a dynamo-electric machine by adjusting the flow of coolant through the rotor. According to one embodiment of the invention, the cooling flow is adjusted by inserted baffles into the axial coolant flow passages in the body portion of the rotor. According to another embodiment of the invention the cooling flow is adjusted by inserting adjustable orifices into the radial cooling passages in the body portion of the rotor.

Abstract: A pole face slot filler (26,28) for insertion into a pole face slot formed in a pole region (18) of a generator rotor, the filler (26,28) having a U-shaped cross section and being composed of a base portion (36) and two leg portions (38) extending from the base portion (36) and forming the legs of the U-shaped cross section, wherein the filler (26,28) is configured and dimensioned to achieve a press fit in the pole face slot.

Abstract: A method and apparatus for locking the wedges used in a dynamoelectric machine having a radically ventilated rotor keys each wedge to its respective damper bar. By inserting a solid key in a selected keyway proximate to a point midway along the length of the rotor, and inserting split keys elsewhere, accumulated axial migration of the wedges relative to their respective damper bar is limited thereby ensuring adequate ventilation through the radically extending ducts.

Abstract: A rotor end turn winding and support system is disclosed which provides support in the radial, axial and circumferential directions for the end turns of a superconducting rotor field coil. The end turn conductor stack is tilted from a purely radial position to facilitate the winding of the small, flexible conductors of a superconducting rotor.

Abstract: A support structure for unitizing coil turns into a single member and bracing each coil of a multi-coil stator dynamoelectric machine. Each stator coil includes several turns relatively concentrically disposed. Each coil turn constitutes two longitudinal conductor portions and two end turn conductor portions. One end turn portion serially connects two longitudinal portions and the remaining end turn portion serially connects one of the longitudinal portions with a longitudinal portion of a concentrically adjacent coil. Each coil preferably lies in a plane defined by a portion of a cylinder and the coils are disposed in a cylindrical arrangement having a longitudinal axis therethrough such that one longitudinal portion of the outermost coil turn lies along the outer radial extent of the cylindrical arrangement and the remaining longitudinal portion of the outermost coil turn lies radially nearer the longitudinal axis of the cylindrical arrangement.

Abstract: A method of thermal insulating a supercooled component of a superconducting apparatus is disclosed herein and includes a thermal radiation shield which is maintained at a reduced temperature relative to its ambient surroundings for more efficiently shielding its associated inner cooled component. The shield is cooled, preferably internally, by the direct application of a fluid refrigerant, specifically helium gas.

Abstract: A rotor is provided for an alternating current generator having a superconducting field winding. The rotor consists of a cylindrical outer member and a cylindrical inner member disposed coaxially inside the outer me mber. The inner rotor member carries a superconducting field winding and is cooled to maintain the winding temperature at superconducting temperatures during operation. The inner rotor member is rigidly attached at one end to the outer member and at the other end, which is the drive end, a connection is provided between the inner and outer members which has sufficient axial flexibility to allow large differential thermal expansion and contraction of the inner member, and which has sufficient torsional stiffness to transmit driving torque between the members. The flexible connection is preferably a laminated structure made up of thin slotted laminations having elements extending radially between the two rotor members and a driving connection to the inner member.

Abstract: The sliding support connection of the inner rotor to the rotating outer rotor and stub shaft of the generator power train is closed by a flexible diaphragm which has protruding axially therefrom a plurality of integrally attached fingers. These fingers, at an outside radial surface, bear into a complementary cylindrical cavity in the end of the stub shaft having female spline receiving concavities. The fingers on their inside dimension define a frustoconical surface which bears against a spring loaded frustoconical mandrel, preferably loaded by a Belleville spring. During thermal axial excursion incident to cool down, the fingers by sliding into and out of the spline concavities in the stub shaft accommodate relative axial movement of the inner rotor relative to the outer rotor. During on-line operation of the rotor, the fingers maintain a positive and nonsliding fit with the stub shaft so that by positive outward pressure at the fingers, slip and fretting corrosion of the fingers and stub shaft is prevented.

Abstract: In a superconducting generator rotor, inner and outer rotor structures are rigidly connected against torsional and axial relative movement at one end of the rotor. At the opposite end of the rotor a sliding support permits relative axial movement of the inner rotor relative to the outer rotor during cool down. The sliding support connection of the inner rotor to the rotating outer rotor and stub shaft of the generator power train is closed by a flexible diaphragm which has protruding axially therefrom a plurality of integrally attached fingers. These fingers, at an outside radial surface, bear into a complementary cylindrical cavity in the end of the stub shaft having female spline receiving concavities. During thermal axial excursion incident to cool down, the fingers by sliding into and out of the spline concavities in the stub shaft accommodate relative axial movement of the inner rotor relative to the outer rotor.