Abstract: The present invention facilitates the placement of laminations 10 onto keybars 6 of stator generators frames 2. Laminations need to be tightly fit onto keybars 6, however, the same need for tightness makes stacking laminations onto keybars particularly onerous. This is magnified when donuts, which are preassembled groups of laminations, are attempted to be stacked onto the keybars 6. The present invention provides for enlarged grooves 12 that more easily accept the keybars. This makes stacking laminations, both individually and in donuts, much easier. The laminations are then held in position by the insertion of a wedge 16. The wedge may be placed to disperse forces 20 transferred to the laminations in a circumferential manner 22.

Abstract: A stator assembly method is disclosed for constructing a generator stator in the field. For stator assembly, the method includes the steps of positioning a stator frame on an assembly site; inserting a plurality of stator core modules into the stator frame; clamping the stator core modules together to form a stator core, attaching the stator core to the stator frame; and, winding a plurality of coil windings into the stator core. The stator may be positioned substantially vertically or horizontally at various steps in the method. The stator assembly method may also employ an assembly base to facilitate construction of the stator in the field.

Abstract: An improved stator core and process for manufacturing the core are accomplished by a modular stator core design. The stator core is comprised of a series of equally sized and shaped stator core modules that are manufactured via a vacuum pressure impregnation process. The prefabricated modules can then be assembled into a stator core in an efficient way, saving several days of stator core assembly time. Moreover, a variety of stator core lengths can be accommodated by only inserting the required number of modules into the stator frame.

Abstract: A support system for an electric generator having a tapered spring bar connected between the stator core and stator frame, where the spring bar has a continuously tapered cross-sectional area along its length. The tapered cross-section provides a larger cross-sectional area at points having high bending moment and a smaller cross-sectional area at points having low bending moment. By eliminating material in areas of low bending force, a robust support system having increased flexibility is provided. The spring bar may further be formed from a plurality of thinner laminations, thereby providing the support system designer with an additional degree of flexibility for independently controlling the natural frequency of the supports in the radial and tangential directions.

Abstract: A support system for an electric generator having a spring bar connected between the stator frame and a vertical spring plate mounted on a foundation. The spring bar provides flexibility in the tangential direction to minimize the magnitude of torque loads transmitted to the foundation during short circuit operating conditions. The spring plate provides flexibility in the radial direction to minimize the magnitude of vibration loads transmitted to the foundation during normal operating conditions. The combination of a spring bar with a spring plate allows the support system designer to optimize the natural frequency of the support system in both the tangential and radial directions.

Abstract: In an electrodynamic apparatus, a method of securing a coil basket of the type that includes a plurality of top coils and a plurality of bottom coils to a bracing assembly that includes a plurality of support braces includes steps of banding the top coil, the bottom coil and the support brace to each other; positioning a number of inflatable bladders, respectively, between the top coils and the bottom coils in the location of the bandings; and simultaneously inflating the bladders to a predetermined pressure that is sufficient to tension the bandings to a predetermined force, whereby forces that are transmitted to the coil basket from such inflation are imparted evenly throughout the coil basket and at the same time. An improved end winding region support system is also described.

Abstract: An improved stator core and process for manufacturing the core are accomplished by a modular stator core design. The stator core is comprised of a series of equally sized and shaped stator core modules that are manufactured via a vacuum pressure impregnation process. The prefabricated modules can then be assembled into a stator core in an efficient way, saving several days of stator core assembly time. Moreover, a variety of stator core lengths can be accommodated by only inserting the required number of modules into the stator frame.

Abstract: A fluted stator frame for an electric generator is provided. The fluted stator frame has a frame shell, a plurality of flat plates, a plurality of inner frame rings and a plurality of revised axial spring bars. A stator core is connected to the inner frame rings by means of the revised axial spring bars. The inner frame rings are connected to the frame shell by means of the flat plates. Each flat plate is slanted so that the plurality of flat plates are arranged in a truss formation. The spaces between the flat plates and the frame shell define gas flow ducts. The gas flow ducts provide a path for a flow of cooling gas to remove heat from the stator core of the generator.

Abstract: A remote frequency adjustment system for controlling the vibrational frequency of the coils of a stator of a turbine generator. The system includes a top coil and a bottom coil supported by a coil support brace and a frequency adjustment system that allows for remote adjustment of the characteristic frequency of the coils.

Abstract: In an electrodynamic apparatus, a method of securing a coil basket of the type that includes a plurality of top coils and a plurality of bottom coils to a bracing assembly that includes a plurality of support braces includes steps of banding the top coil, the bottom coil and the support brace to each other; positioning a number of inflatable bladders, respectively, between the top coils and the bottom coils in the location of the bandings; and simultaneously inflating the bladders to a predetermined pressure that is sufficient to tension the bandings to a predetermined force, whereby forces that are transmitted to the coil basket from such inflation are imparted evenly throughout the coil basket and at the same time.