Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-06-09
2003-07-08
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S269000
Reexamination Certificate
active
06590311
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to electrical machines and, more particularly, to a cross-shaped rotor for a rotating electrical machine, such as a generator, including fins that increase the section bending moment of inertia about an axis.
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 which supply electrical power output.
Conventional generator rotors use cross-slots to equalize the bending stiffness between direct (D) and quadrature (Q) axes. With newer generators using a modular winding assembled over a solid rotor with parallel sides, dissymmetry of the bending stiffness is aggravated and effective winding support and position become significant challenges.
BRIEF SUMMARY OF THE INVENTION
In an exemplary embodiment of the invention, a generator rotor includes pole faces arranged at locations on a direct axis and fins arranged along a quadrature axis such that the rotor is cross-shaped. The direct and quadrature axes are each normal to the rotor axis of rotation. The fins act to increase a section bending moment of inertia about the direct axis and provide winding position reference and bases of winding support. In one embodiment, the rotor includes two pole faces situated on the direct axis at either side of the quadrature axis, respectively. The fins may be formed integral with the rotor, such as by machining, forging welding, or casting. Alternatively, the fins may be mechanically secured to the rotor.
In another exemplary embodiment of the invention, an electric generator includes a rotor provided with field windings and a stator provided with armature windings which supply electrical power output. The rotor comprises pole faces arranged at locations on a direct axis and fins arranged along a quadrature axis such that the rotor is cross-shaped.
REFERENCES:
patent: 336636 (1886-02-01), Gerard-Lescuyer
patent: 640760 (1900-01-01), Geisenhoner
patent: 729655 (1903-06-01), Parsons
patent: 1502527 (1924-07-01), Reichel et al.
patent: 2733362 (1956-01-01), Bauer
patent: 3375385 (1968-03-01), Young
patent: 3590301 (1971-06-01), Woydt
patent: 4163912 (1979-08-01), Gottung et al.
patent: 4336470 (1982-06-01), Gutris
patent: 4490638 (1984-12-01), Lind
patent: 5144182 (1992-09-01), Lemmer et al.
patent: 5359248 (1994-10-01), Nagate et al.
patent: 5811907 (1998-09-01), Fukuda et al.
Alexander James Pellegrino
Ghanime George Hanna
Kaminski Christopher Anthony
Wang Yu
Armstrong Teasdale LLP
General Electric Company
Waks Joseph
LandOfFree
Cross-shaped rotor shaft for electrical machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cross-shaped rotor shaft for electrical machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cross-shaped rotor shaft for electrical machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3067120