Westinghouse Electric Corporation

Siemens Westinghouse Power Corporation

Siemens Energy, Inc.

Siemens Power Generation, Inc.

John Barry Sargeant

Gurdev Dave Singh

Calvin L Paris

David Norwood Dorsey

Kevin Joseph Konrad

George F Dailey

James Alan Bauer

Charles M Rowe

David Thomas Allen

Lon W Montgomery

David B Berrong

Luis E Carbonell

Robert Allen Fuller

Alex Christodoulou

Robert T Hagaman

Thomas M Majernik

Lorenzo Ramirez

Derek Wayne Green

Jan W Seyler

David T Allen

David Bruce Berrong

James Alan Cook

A generator including a generator frame (, FIG.), frame rings () extending from an inside surface of the frame (), stacked laminations forming a stator core () disposed within the generator frame (), a spring bar (, FIG.) spanning a distance between at least two frame rings (), a first spring bar end attached to a first frame ring () and a second opposing spring bar end attached to a second frame ring (), at least one bracket () attached to the spring bar (); and a first and a second keybar () attached to the bracket (), each keybar () for engaging a corresponding groove within the stator core ().

Methods and apparatuses for attaching a stator core to a generator frame

The present invention provides an apparatus for the horizontal stacking of laminationsand donuts to form a stator core. A stator generator framehas multiple keybarsthat run the axial length of the frame. The laminationshave groovesthere-in that engage the keybars to provide a secure fit of the laminations to the generator frame. By extending two or more of the keybarsthese extensionsmay be used as rails on which the laminations may be horizontally inserted into the stator frame.

Horizontal assembly of stator core using keybar extensions

The present invention facilitates the placement of laminationsonto keybarsof stator generators frames. Laminations need to be tightly fit onto keybars, 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. The present invention provides for enlarged groovesthat 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. The wedge may be placed to disperse forcestransferred to the laminations in a circumferential manner

Method and apparatus for the mounting of and circumferential displacement of radial forces in a stator core assembly

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.

Method for assembly of a stator in the field

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.

Modular design and manufacture of a stator core

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.

Spring mounting for an electric generator

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.

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.

Method for securing a generator end winding system

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.

Fluted stator frame for electric generators

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.

Remote frequency control system for controlling the vibrational

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.

Generator end winding system

A rotor for an electromagnetic energy conversion device, which rotor includes a core composed of a stack of thin plates, is clamped between two end plates by means of a plurality of end clamping fingers. Each clamping finger is initially mounted on a respective end plate and is then pressed against the core by a clamping force applied via the end plates.

Rotor core structure for an electromagnetic rotating machine

An electromagnetic rotating machine having an annular stator and a rotor disposed within the stator, the stator including a frame and stator laminations secured to the frame and located radially inwardly of the frame, and the stator being mounted on a rigid foundation such that the rotor has a vertical axis of rotation, and stator shape stabilizing devices connected between the stator frame and the foundation at a plurality of spaced points around the stator frame for imposing outwardly directed radial forces on the frame at the spaced points in a manner to maintain a circular configuration for the frame.

Stator stabilizing assemblies

In a stator core for a rotating electromagnetic machine, which core has two axial ends and at least one end shield at one axial end of the core, the end shield being composed of a plurality of thin plates at least one of which is a vent plate, and a vent structure supported by the vent plate, extending axially between the vent plate and an adjacent thin plate and presenting a plurality of radial flow passages for ventilating air, the vent structure is composed of: at least two elongate positioning members extending tranversely to the radial direction of the stator core, secured to the vent plate and having an axial dimension which is smaller than the axial distance between the vent plate and the adjacent thin plate; and a plurality of vent fingers extending generally in the radial direction of the core and held in position at least partially by the positioning members, each vent finger having an axial dimension equal to the axial distance between the vent plate and the adjacent thin plate and a cross section greater than that of each positioning member.

Growing community of inventors

Oviedo, FL, United States of America

John Barry Sargeant