US3749953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilated dynamoelectric machines
Assignee: General Electric Co
•
Filing: 1972-02-24
•
Granted: 1973-07-31
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Expires: 1992-02-24
Abstract
Abstract A dripproof (open ventilation) dynamoelectric machine is improved by the addition of an auxiliary fan and fan enclosure of totally enclosed design to either or both ends of the basic dripproof machine. The fan and its associated enclosure direct at least a majority of the air passing into the fan enclosure through the adjacent dripproof end shield to the end turn cavity of the dynamoelectric machine for enchanced cooling of the stator winding end turns. After passing over the end turns, the air flow is exhausted by the end shield curvature axially along the outer periphery of the machine to flow between a plurality of cooling fins extending outwardly from the stator frame to further cool the machine.
Inventors
- 👤 F Baumann
- 👤 G Rosenberry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:00
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/02; H02K9/04; H02K9/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
253 words
A dynamoelectric machine comprising; a stator having a stator winding including winding end turns extending from opposite ends of the stator, a rotor rotatably mounted within the stator, a stator frame circumferentially disposed about said stator, end shields disposed proximate each end of the stator to define end turn cavities respectively between the stator ends and said shields, each of said end shields having non-symmetrical intake orifices therein for admitting air to the end turn cavity associated therewith and defining with said frame an exhaust opening radially outward from said stator for passing air out of said cavity axially along the outer periphery of the stator frame, first fan means comprising two sets of rotor mounted fan blades (22 and 22a), each said set of fan blades being disposed respectively within one of said end turn cavities for moving air therein, a fan enclosure disposed in a position axially spaced outward from at least one end shield and, together with said one end shield, defining a fan space, said fan enclosure having an aperture for passing air therethrough into said fan space, and said fan enclosure further having wall means for directing at least a majority of said air out of said fan space and into the end turn cavity associated therewith through said orifices in said end shield, and second fan means disposed within said fan space for moving said air through said aperture into said fan space and thence into cooperation with said air directing means and said first fan means.
Claim 2
Dependent Claim
253 words
A dynamoelectric machine comprising; a stator having a stator winding including winding end turns extending from opposite ends of the stator, a rotor rotatably mounted within the stator, a stator frame circumferentially disposed about said stator, end shields disposed proximate each end of the stator to define end turn cavities respectively between the stator ends and said shields, each of said end shields having non-symmetrical intake orifices therein for admitting air to the end turn cavity associated therewith and defining with said frame an exhaust opening radially outward from said stator for passing air out of said cavity axially along the outer periphery of the stator frame, first fan means comprising two sets of rotor mounted fan blades (22 and 22a), each said set of fan blades being disposed respectively within one of said end turn cavities for moving air therein, a fan enclosure disposed in a position axially spaced outward from at least one end shield and, together with said one end shield, defining a fan space, said fan enclosure having an aperture for passing air therethrough into said fan space, and said fan enclosure further having wall means for directing at least a majority of said air out of said fan space and into the end turn cavity associated therewith through said orifices in said end shield, and second fan means disposed within said fan space for moving said air through said aperture into said fan space and thence into cooperation with said air directing means and said first fan means.
Claim 3
Dependent Claim
106 words
The dynamoelectric machine of claim 1 in which said first fan means includes a plurality of nominal rotor diameter fan blades mounted at one end of said rotor and a plurality of enlarged rotor fan blades mounted on the other end of said rotor, said enlarged fan blades being formed to extend axially into their associated end turn cavity (19'') and to also extend radially outward to overlie the ends of the stator end turns adjacent thereto, and wherein said second fan means includes a radial fan mounted upon the shaft of said rotor outboard from the rotor diameter fan blades of the first fan means.
Claim 4
Dependent Claim
40 words
A dynamoelectric machine according to claim 1 wherein the entire air streams passing through said orifices are passed respectively into the end turn cavities before being directed toward one another along the outer surface of the frame of the machine.
References Cited (Backward Citations)
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US2716195A
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US2783398A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |