Abstract: A non-metallic structural enclosure for a generator rotor replaces conventional containment components including rotor wedges, rotor teeth and retaining rings. The enclosure includes a non-metallic tube formed of a plurality of spaced rings or of a continuous tube including ventilation holes or slots. The simplified rotor assembly serves to restrain the winding against centrifugal forces with a more highly optimized use of space and materials. The arrangement allows more space for copper and ventilation, thereby benefiting both efficiency and the performance of the machine. The use of individual rings has the additional benefit of providing restraint against centrifugal forces without reducing the effectiveness of cross slots in the rotor body from correcting peripheral dissymmetries in rotor stiffness. The rings also provide openings for ventilation without introducing stress concentrations in the enclosure.

Abstract: Methods and systems for evaluating individual components of total indicated runout readings. The individual components include the once-per-revolution (eccentricity), twice-per-revolution (ellipticity), and thrice-per-revolution runout components. In one embodiment, the method establishes a screening value for a total indicated runout reading. If a measured total indicated runout of a circular cross-section in question is less than this screening value, then the cross-section is acceptable. Conversely, if the measured total indicated runout exceeds the screening value, then the circular cross-section may or may not be acceptable. Further evaluation of the cross section can include recording runout readings at different locations around the circular cross-section, and fitting these runout readings to a regression equation. The magnitude of the individual runout components can then be calculated using constants derived from this regression equation.

Abstract: The conventional bar by bar assembly of a generator rotor can be replaced with a solid rotor having parallel slots milled into a rotor forging so that containment components can be replaced with a simplified enclosure. A dynamic blocking restraint assembly is beneficial to control winding position, to prevent load dissymmetries against the winding enclosure, and to provide sufficient preload to obtain predictable behavior in all expected modes of operation. The blocking assembly includes a sandwich construction of a first support block, at least one spring, additional wedge-shaped spacers in the case of multiple springs, and a second support block disposed in a symmetrical arrangement substantially aligned with the quadrature axis of the rotor. The assembly serves to provide circumferential restraint and to match the structural hoop stiffness of the winding enclosure. The construction of components can be configured to accommodate any desired degree of preloading.

Abstract: An electrically conductive enclosure shield is disposed between a rotor enclosure and the rotor winding assemblies. The shield reduces transverse shear loads generated by non-uniform centrifugal radial forces in a generator rotor, while providing adequate electromagnetic shielding for the field winding. Ventilation holes in the shield enable ventilation gas discharge, and shallow ridges may be provided that serve as axial positioning guides for enclosure rings. Additionally, the enclosure shield advantageously adds axial stiffness to the rotor.

Abstract: An enclosure formed of a non-magnetic material occupies space in the non-magnetic gap between the rotor and stator. As the enclosure thickness increases, the size of the air gap, which is the non-magnetic gap minus the enclosure thickness, becomes smaller, and the resistance to the axial flow of gas coolant decreases. A non-circular shaped enclosure provides additional area between the rotor and stator for axial transfer of gas and minimizes the non-magnetic gap at the d-axis while maximizing the air gap at the q-axis. The shape of the enclosure also reduces the centrifugal force in the vicinity of the q-axis and delivers a more circular shape as a result of the deformation at operating speed.

Abstract: A holder for a lamp bulb comprises an insulating housing having a terminal receiving part and a socket for the lamp bulb. The terminal receiving part defines first, second and third terminal receiving cavities opening into a terminal receiving end of the housing. One of the cavities receives an electrical terminal having a spring contact beam projecting into the socket for engaging one contact of the lamp bulb, and a slot receiving one lead of a diode. Another of the cavities receives an electrical terminal having a slot for receiving the other lead of the diode and a further slot for receiving a first supply lead. When these two terminals have been inserted into their cavities, a third terminal is inserted into its cavity, after the leads of the diode have been securely lodged in the diode receiving slots of the first two terminals. The third terminal has a spring contact beam which projects into the socket for engaging the other contact of the bulb, and a slot for receiving a second supply lead.

Abstract: An electrical connector is shown for terminating both signal and coaxial cable. To maintain the same interface pattern, the signal pins for the coaxial cable include contact portions with angled connection sections and ground contacts for contacting the shielding braid of a cable are laterally offset. The housing includes channels to arrange the coaxial cables with the signal contact termination portions and with the ground contact termination portions.

Abstract: An electrical connector comprises as shown in FIGS. 23 to 25, an insulating housing defining a socket for an electrical lamp bulb and first and second cavities and for receiving a first terminal and a second terminal respectively. The first terminal has a contact spring in the socket, the second terminal having a contact spring in the socket. An electric lamp bulb can be inserted into the socket so that contacts of the bulb are resiliently engaged by the respective contact springs. Each terminal also has a slotted plate portion for connection to an insulated electrical lead. The top wall of the housing is formed with two spaced holes for receiving lead wires of a diode. The first terminal has, a spring socket aligned with each of the holes and. Between the spring sockets, the first terminal has a reduced cross section severable portion, which is accessible to be sheared by shearing tooling, by way of an opening in the top wall and an opening in the opposite wall of the housing.

Abstract: The dynamoelectric machine has endwindings 24 including a plurality of superposed conductor bars 22 and adjacent end turns 20. Rabbets 32 are formed along the undersides of the adjoining conductor bars and end turns to receive gussets 30 for reinforcing the joints therebetween. One or more of the conductor bars and end turns have cooling passages 36, 38 with ports 40, 42 opening to one side of the joint at locations short of the joint. A cooling block 48 is disposed on one side of the joint extending between the superposed conductor bars and superposed adjacent end turns and spaced from the joint to define a chamber 60 in communication through the ports with the passages for passing cooling gas therethrough in heat exchange relation to the joint assembly.

Abstract: Rotor slot insulation for dynamoelectric machines having rotors with subslots including two slot armors, each extending in an offset manner to the transition between the rotor slot and subslot and into the subslot a distance sufficient to eliminate the need for a subslot cover and for providing a creepage path of sufficient length as to prevent creepage between slot windings and rotor iron.

Abstract: A conductor bar in a dynamoelectric machine includes a coolant channel having a depressed portion passing under a gusset reinforcing a joint with an end turn. The end turn also includes a coolant channel with a depressed portion under the gusset and meeting the depressed portion in the conductor bar. The gusset includes a groove therein, generally congruent with the two depressed portions passing thereunder. Diagonal entry and exit portions on the underside of the gusset reduce flow turbulence of coolant entering and exiting the flow channel defined between the gusset and the two depressed portions. In a further embodiment of the invention, a diagonal portion joining the two depressed portions, matched with a congruent shape in the gusset, both reduces flow resistance and increases an area available for brazing the gusset in place.

Abstract: A ventilation system for end turn conductors spanning a pole face of a rotor of a dynamoelectric machine includes a first plurality of end turn conductors having a first plurality of longitudinally extending ducts having a respective coolant gas inlet disposed proximate the pole center and a respective coolant gas outlet disposed inboard of the end of the rotor body, and a second plurality of end turn conductors alternately stacked with, electrically insulated from and disposed in heat flow communication with the first plurality of end turn conductors. Each of the second plurality of end turn conductors includes a longitudinally extending gas coolant duct, having a coolant gas inlet proximate the winding corner and a coolant gas outlet inboard the end of the rotor body. The system is especially applicable to rotor windings wherein the conductors forming the end turns are not large enough to carry adjacent gas coolant ducts without compromising the structural and mechanical integrity of the winding.

Abstract: A rotor slot insulation system includes two L-shaped insulative armors lining a slot that is disposed in the rotor for receving a conductor. The short legs of the insulative armors, which are disposed at the bottom of the slot, face each other and preferably abut. A spacer device overlays the short legs for spacing the conductor away from the corners of the armors and for increasing the electrical path from the conductor to the rotor. The spacer device and insulative armors may be secured by disposing a member, which is affixed to the spacer device, to engage the short legs of the insulative armors and to extend into a recess in the bottom of the slot.

Abstract: A ventilation scheme for rotor windings in a dynamoelectric machine includes passages axially extending through the axial end turn conductors of the windings. Each axially extending conductor is an integral, single bar of metal having a groove thereon which defines the passages in cooperation with the turn insulation interposed between each conductor and the underlying and overlaying conductors. Circumferential end turn conductors are mechanically and electrically attached to the axial end turn conductors by reinforcing plates. Circumferential passages through the circumferential end turn conductors allow gas to flow between an end turn region and an isolated low pressure area. The centrifugal pumping action developed by the rotation of the rotor draws gas from the end turn region through the passages and to the periphery of the rotor body.

Abstract: In a gas-cooled generator or other dynamoelectric machine, wedges are provided for retention of the field windings and for introducing the cooling fluid into passages through the field windings to provide rotor cooling. In particular, the wedge of the present invention possesses pairs of bidirectionally curved inlet passages so as to smoothly convert a tangential flow of gas into a gas flow having both radially inward and longitudinal components. The wedges are particularly useful in cooling dynamoelectric machine rotors having a diagonal flow, gap pickup cooling system.