Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-01-26
2001-05-29
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S089000, C310S261100
Reexamination Certificate
active
06239527
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to generators and, more particularly, to a field winding enclosure having a non-circular shape.
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. Containment of the rotor field windings can be achieved by enclosing the assembly in an enclosure, which eliminates the need for rotor wedges, rotor teeth and retaining rings.
Reluctance is the magnetic analog to resistance in an electric circuit. The reluctance of a magnetic circuit in an electric power generator is most sensitive to the size in the gap between the generator rotor and stator along the rotor pole direction (d-axis), where most of the flux transfer takes place, and is least sensitive 90° away (along the q-axis). Centrifugal loading, on the other hand, is primarily distributed along the q-axis.
BRIEF SUMMARY OF THE INVENTION
In an exemplary embodiment of the invention, an enclosure for a rotor in a generator is formed of a non-circular shape and preferably of a non-magnetic material. The enclosure may be formed of a filament wound tube or alternatively of a plurality of filament wound rings. The non-circular shape is preferably substantially oval corresponding to two or three arc segments for each quadrant. The enclosure may be shaped to provide a circular curvature over each pole face of the rotor. In the context of the three arc segments, each circular curvature is substantially concentric with a rotor axis of rotation.
In another exemplary embodiment of the invention, a rotor in a generator includes a two-pole magnetic core, two core assemblies, one for each pole, and an enclosure housing the core and the core assemblies, wherein the enclosure is formed of a non-circular shape.
REFERENCES:
patent: 2119477 (1938-05-01), Weydell
patent: 3062979 (1962-11-01), Jarret
patent: 3132269 (1964-05-01), Craske
patent: 3900749 (1975-08-01), Carriker
patent: 4506182 (1985-03-01), Rohdin
patent: 5359248 (1994-10-01), Nagate et al.
patent: 5650682 (1997-07-01), Smart
patent: 5808389 (1998-09-01), Stephenson
patent: 5844343 (1998-12-01), Horst
Kaminski Christopher A.
Wang Yu
General Electric Company
Nguyen Tran
Nixon & Vanderhye P.C.
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