US3725706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer system for dynamoelectric machine
Assignee: General Electric Co
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Filing: 1971-07-26
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Granted: 1973-04-03
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Expires: 1991-07-26
Abstract
Abstract A dripproof dynamoelectric machine is described wherein air is admitted through the end shields directly into the end turn cavities at opposite ends of the machine to be circulated across the radially inner faces of the end turns before being expelled from the end of the machine whereat the air was admitted. The exhaust air then is directed across the motor frame by a shroud overlying the exhaust apertures to cool the stator by the transfer of heat from the stator laminations through the frame to the air circulating across the frame. Preferably the frame is finned to maximize the heat transfer surface in contact with the flowing air and the fans are secured to the rotor end rings. For increased volumetric flow of the air through the motor, the fans utilized to circulate the air through the end turn cavities underly the end turns adjacent the stator laminations and extend radially outward beyond the stator end turns to overlie the end turns.
Inventors
- 👤 A Lukens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:13
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/02; H02K9/04; H02K9/06; H02K5/00; H02K5/04; H02K5/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
373 words
A dynamoelectric machine comprising: a rotor having an axial shaft journaled for rotation, a stator formed of a plurality of annular magnetic laminations stacked in registration to form a bore for said rotor, said stator having a winding with coil sides disposed within slots in said magnetic laminations and end turns protruding beyond the ends of said laminations, a housing circumferentially disposed about the periphery of said stator laminations, said housing directly contacting the entire circumferential edges of said laminations to permit the transfer of heat therebetween, a plurality of spaced fins disposed about the periphery of said housing and extending axially along said housing for substantially the entire length of the stator core, said fins having a radially inner edge in contact with said housing and a radially outer edge open to the atmosphere, end shields mounted at opposite ends of said machine, each of said end shields having a cooling intake orifice, the diameter of said end shields proximate said stator housing being larger than the diameter of said housing to form air exhaust orifice between said housing and said end shields, the axially inner edge of said end shields circumferentially overlying the ends of said stator frame to form an air directing region therebetween, and fan means mounted at opposite ends of said rotor for drawing air into both ends of said machine to pass over the radially inner faces of said end turns, said fan means drawing the entire air streams flowing into said machine through unobstructed apertures in said end shields into direct contact with the end turns situated between said stator and said end shields, said air streams being impelled radially outward by said fan means to pass across the radially inner face of said end turns before flowing radially outward to the air directing region between said end shield and said stator frame situated at the end of the machine through which said air streams were respectively admitted, said air streams being directed in axially opposite directions along the exterior surface of said housing to pass between said fins and absorb heat conducted from said stator through said housing, said air being deflected radially outward away from said machine near the axial center of said machine.
Claim 2
Dependent Claim
373 words
A dynamoelectric machine comprising: a rotor having an axial shaft journaled for rotation, a stator formed of a plurality of annular magnetic laminations stacked in registration to form a bore for said rotor, said stator having a winding with coil sides disposed within slots in said magnetic laminations and end turns protruding beyond the ends of said laminations, a housing circumferentially disposed about the periphery of said stator laminations, said housing directly contacting the entire circumferential edges of said laminations to permit the transfer of heat therebetween, a plurality of spaced fins disposed about the periphery of said housing and extending axially along said housing for substantially the entire length of the stator core, said fins having a radially inner edge in contact with said housing and a radially outer edge open to the atmosphere, end shields mounted at opposite ends of said machine, each of said end shields having a cooling intake orifice, the diameter of said end shields proximate said stator housing being larger than the diameter of said housing to form air exhaust orifice between said housing and said end shields, the axially inner edge of said end shields circumferentially overlying the ends of said stator frame to form an air directing region therebetween, and fan means mounted at opposite ends of said rotor for drawing air into both ends of said machine to pass over the radially inner faces of said end turns, said fan means drawing the entire air streams flowing into said machine through unobstructed apertures in said end shields into direct contact with the end turns situated between said stator and said end shields, said air streams being impelled radially outward by said fan means to pass across the radially inner face of said end turns before flowing radially outward to the air directing region between said end shield and said stator frame situated at the end of the machine through which said air streams were respectively admitted, said air streams being directed in axially opposite directions along the exterior surface of said housing to pass between said fins and absorb heat conducted from said stator through said housing, said air being deflected radially outward away from said machine near the axial center of said machine.
Claim 3
Dependent Claim
72 words
A dynamoelectric machine as defined in claim 1 wherein at least one of said fan means is characterized by a radially outer portion contoured to overlie and extend axially beyond said end turns, said machine further including a baffle disposed between the end shield adjacent said one fan means and said one fan means, the outer extremities of the blades of said fan following the axially inner contour of said baffle means.
Claim 4
Dependent Claim
313 words
In a dynamoelectric machine having a stator and a rotor journaled for rotation therein, said stator including an aluminum housing having cooling fins disposed axially on the outer suRface thereof and extending substantially the entire axial length of the stator, cooling means comprising: fan means mounted on the rotor end ring at each end of said rotor for rotation therewith; a pair of end shields adapted to be mounted at opposite ends of said stator, each of said end shields having inlet means at the axially outward end of said end shields and outlet means disposed about the periphery of the axially inward ends of said end shields between said end shields and said housing; said end shield outlet means being disposed in a confronting attitude with said cooling fins so that air flows from said outlet means pass in axially opposite directions between the cooling fins along the exterior of said housing before said air flows meet near the center of said machine and are deflected radially away from said machine, and annular baffle means adapted to be mounted within said end shields, said baffle means having a first portion which extends circumferentially inward about said shaft at the ends of said rotor and having a second portion which extends radially outward therefrom the meet said end shields, said baffle means defining an inlet channel extending from said inlet means to said shaft and an outlet channel extending from the end of said rotor to said end shield outlet means, the complete air flow through said machine passing unobstructedly through said inlet channel directly into communication with said fan means, said fan means impelling the air stream radially outward across the radially inner face of said end turns to said outlet channel for exhaust through the outlet means disposed at the end of the machine through which said air stream was admitted.
Claim 5
Dependent Claim
313 words
In a dynamoelectric machine having a stator and a rotor journaled for rotation therein, said stator including an aluminum housing having cooling fins disposed axially on the outer suRface thereof and extending substantially the entire axial length of the stator, cooling means comprising: fan means mounted on the rotor end ring at each end of said rotor for rotation therewith; a pair of end shields adapted to be mounted at opposite ends of said stator, each of said end shields having inlet means at the axially outward end of said end shields and outlet means disposed about the periphery of the axially inward ends of said end shields between said end shields and said housing; said end shield outlet means being disposed in a confronting attitude with said cooling fins so that air flows from said outlet means pass in axially opposite directions between the cooling fins along the exterior of said housing before said air flows meet near the center of said machine and are deflected radially away from said machine, and annular baffle means adapted to be mounted within said end shields, said baffle means having a first portion which extends circumferentially inward about said shaft at the ends of said rotor and having a second portion which extends radially outward therefrom the meet said end shields, said baffle means defining an inlet channel extending from said inlet means to said shaft and an outlet channel extending from the end of said rotor to said end shield outlet means, the complete air flow through said machine passing unobstructedly through said inlet channel directly into communication with said fan means, said fan means impelling the air stream radially outward across the radially inner face of said end turns to said outlet channel for exhaust through the outlet means disposed at the end of the machine through which said air stream was admitted.
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |