Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-01-26
2001-11-06
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S216006, C310S216055, C310S216055
Reexamination Certificate
active
06313561
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to generators and, more particularly, to a blocking restraint for rotor field windings in an enclosure for a generator rotor.
In a conventional generator having a rotor and a stator, the rotor is provided with field windings that excite the generator while receiving a current from an exciting current source. The stator is provided with armature windings from which electrical power is output. Typical rotor construction requires that a field winding be assembled bar by bar, into radial slots milled into a rotor forging. Containment of the rotor field windings is typically achieved using rotor wedges, rotor teeth and retaining rings.
It would be desirable to replace the bar by bar assembly with a solid rotor having parallel slots milled into a rotor forging. With this structure, the containment components could be replaced with a simplified enclosure. Filament wound enclosure rings are more elastic and allow greater freedom of motion to the winding. In this context, however, it 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.
BRIEF SUMMARY OF THE INVENTION
In an exemplary embodiment of the invention, a dynamic blocking restraint assembly is provided for field windings of a generator rotor winding module contained by an enclosure. The dynamic blocking restraint assembly includes a first support block engageable with a rotor field winding, a first spring disposed engaging the first support block, a second support block engageable with an adjacent rotor field winding, a second spring disposed engaging the second support block, and a wedge disposed between the first spring and the second spring. The assembly is preferably constructed in a sandwich for insertion between the rotor field winding and the adjacent rotor field winding in an order of the first support block, the first spring, the wedge, the second spring, and the second support block. At least one additional wedge may be provided, and at least one, corresponding, additional spring may be disposed between the wedge and the additional wedge. The first and second springs are preferably corrugated with the corrugations oriented at an angle relative to edges of the springs. Structural characteristics of the first and second springs may be selected to counterbalance circumferential forces exerted on the winding module.
In another exemplary embodiment of the invention, a generator rotor includes a multi-pole magnetic core and a plurality of core assemblies, one for each pole. The core assemblies define a winding module having a plurality of field windings. The rotor also includes an enclosure housing the core and the core assemblies, and the dynamic blocking restraint assembly of the invention disposed between adjacent first and second field windings. The wedge of the dynamic blocking assembly is preferably substantially aligned with each quadrature axis of the rotor.
In still another exemplary embodiment of the invention, the dynamic blocking restraint assembly includes a first support block and a second support block engageable with a rotor field winding and an adjacent rotor field winding, respectively, and a spring interposed between the first and second support blocks.
REFERENCES:
patent: 3780325 (1973-12-01), Frankenhauser
patent: 5053663 (1991-10-01), Boer et al.
patent: 5078628 (1992-01-01), Garis, Jr.
patent: 5325008 (1994-06-01), Grant
patent: 5498916 (1996-03-01), Lindner et al.
patent: 5854525 (1998-12-01), Pommelet
Kaminski Christopher A.
Nygard Robert J.
Wang Yu
General Electric Company
Lam Thanh
Nixon & Vanderhye P.C.
Ramirez Nestor
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