US3969643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-cooled dynamo-electric machine
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1975-02-19
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Granted: 1976-07-13
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Expires: 1995-02-19
Abstract
Abstract A dynamo-electric machine of the gas-cooled type, for example, an induction of synchronous machine is comprised of a casing which houses a rotor and a stator. A gas-coolant inlet space is provided within the casing at each end thereof and a gas-coolant outlet space is provided between the periphery of the stator and the inner surface of the casing. The internal space occupied by the stator and rotor components is separated from the gas-coolant inlet spaces provided within opposite end portions of the casing and the gas-coolant is force-circulated from the inlet spaces in a radially outward direction through radially extending slots provided in the rotor and stator to the outlet space, the rotor slots functioning as a centrifugal fan in establishing the forced circulation of the gas-coolant through the machine. In addition to the cooling slots in the stator, the gas-coolant passes through a channel provided along each end face of the stator, and these channels are established by annular divider members located in axially spaced relation to the stator end faces and which also function as substantially gas-tight partitions between the channels and the gas-coolant inlet spaces. Also, the end turn portions of the stator winding are located substantially completely within the gas-coolant inlet spaces.
Inventors
- 👤 Jorg Sapper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:13
CPC Classifications
H; H02; H02K; H02K9/00; H02K1/00; H02K1/06; H02K1/12; H02K1/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
321 words
A gas-cooled dynamo-electric machine comrising a casing enclosing a rotor component mounted for rotation and which is surrounded by a laminated stator component having a stator winding thereon, means providing a cooling gas flow inlet space within each end portion of said casing between the end wall thereof and the corresponding ends of the rotor and stator components and in which inlet spaces the end turns at opposite ends of said stator winding are located, means for introducing fresh cooling gas into said gas inlet end spaces for flow in a radially inward direction over said end turn portions of said stator winding, means providing a gas flow outlet space between the periphery of said stator component and the surrounding wall portion of said casing, said rotor and stator components being provided with radially extending slots for flow of cooling gas therethrough from each said gas inlet flow space following its passage over said end turn portions of said stator into said gas flow outlet space, and annular gas flow dividing members located respectively in axially spaced relation to the opposite end faces of said stator and which form substantially gas-tight partitions between the end faces of said stator and said gas flow inlet spaces, said annular gas flow dividing members together with the end faces of said stator thus forming radially extending stator end flow channels for flow of cooling gas from said gas inlet flow space radially outward therethrough into said gas flow outlet space thereby to effect cooling of said end faces of said stator and removal of heat generated in the end portions of said stator laminations, the axial width of said radially extending stator end flow channels being small in relation to the axial width of said gas flow inlet spaces thereby to effect a relatively higher gas flow velocity in said radially extending stator end flow channels than exists in said gas flow inlet spaces.
Claim 2
Dependent Claim
321 words
A gas-cooled dynamo-electric machine comrising a casing enclosing a rotor component mounted for rotation and which is surrounded by a laminated stator component having a stator winding thereon, means providing a cooling gas flow inlet space within each end portion of said casing between the end wall thereof and the corresponding ends of the rotor and stator components and in which inlet spaces the end turns at opposite ends of said stator winding are located, means for introducing fresh cooling gas into said gas inlet end spaces for flow in a radially inward direction over said end turn portions of said stator winding, means providing a gas flow outlet space between the periphery of said stator component and the surrounding wall portion of said casing, said rotor and stator components being provided with radially extending slots for flow of cooling gas therethrough from each said gas inlet flow space following its passage over said end turn portions of said stator into said gas flow outlet space, and annular gas flow dividing members located respectively in axially spaced relation to the opposite end faces of said stator and which form substantially gas-tight partitions between the end faces of said stator and said gas flow inlet spaces, said annular gas flow dividing members together with the end faces of said stator thus forming radially extending stator end flow channels for flow of cooling gas from said gas inlet flow space radially outward therethrough into said gas flow outlet space thereby to effect cooling of said end faces of said stator and removal of heat generated in the end portions of said stator laminations, the axial width of said radially extending stator end flow channels being small in relation to the axial width of said gas flow inlet spaces thereby to effect a relatively higher gas flow velocity in said radially extending stator end flow channels than exists in said gas flow inlet spaces.
Claim 3
Dependent Claim
38 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein the axial width of each stator end flow channel is of the same order as the axial width of the radially extending cooling slots provided in said stator.
Claim 4
Dependent Claim
71 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein said annular flow dividing member comprises one radially extending functional surface opposite to the end face of the stator and forming one side wall of the channel, and an internal cylindrical functional surface surrounding a cylindrical part of the rotor and forming therewith an annular throttle type gas seal preventing flow of gas axially inward from said coolant-gas flow inlet space.
Claim 5
Dependent Claim
39 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein said machine is of the induction type and wherein the cooling gas pressure required for cooling the machine is provided exclusively by the rotor and an end winding thereon.
Claim 6
Dependent Claim
34 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein each of said annular gas flow dividing members comprises in part a plate member applied to the end face of said laminated stator member.
Claim 7
Dependent Claim
97 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein said machine is of the synchronous type, wherein each said annular flow dividing member comprises a first portion extending in a radially outward direction which functions to separate the stator end flow channel from the gas flow inlet space and a second axially extending cylindrical portion surrounding a cylindrical flange portion of a cover plate fastened to the end face of said rotor and which establishes therebetween an annular throttle-type gas seal preventing flow of gas axially inward from said gas flow inlet space through the seal.
Claim 8
Dependent Claim
41 words
A gas-cooled dynamo-electric machine as defined in claim 1 wherein the end face of said rotor is provided with a centrifugal fan including a shroud which incorporates a cylindrical flange that forms the rotor surface part of said annular throttle-type seal.
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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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |