US3866070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbo-generator of the radial slot type
Assignee: ABB Norden Holding AB
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Filing: 1972-12-18
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Granted: 1975-02-11
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Expires: 1992-12-18
Abstract
Abstract A turbo-generator of the radial slot type includes a rotor and a stator surrounding the rotor, the rotor having an iron core and a field winding supported thereby. The field winding has a plurality of coils per pole. The rotor body has recesses therein of substantially the same form as the coils, each formed of two axially running winding slots intended for one coil side and two circumferentially running winding slots at each end of the rotor. The circumferentially running slots are provided with toothed walls and there are a plurality of slot wedges in each of said circumferentially running winding slots having toothed side surfaces in engagement with the walls of the slots to absorb at least the greater part of the centrifugal forces acting on the coil and which lies within the slot.
Inventors
- 👤 Kristian Dahl Madsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:52
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/46; H02K3/48; H02K3/487; H02K3/50; H02K3/51
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
256 words
Turbo-generator of the radial slot type of at least 100 MVA and with a speed of at least 1,500 r.p.m., comprising a stator and a rotor surrounded by the stator and having an iron core and a field winding supported by said iron core, the field winding having a plurality of coils per pole, said rotor body having recesses therein of substantially the same form as the coils, each coil being arranged in a corresponding recess, each recess comprising two axially running winding slots, intended for one coil side each and furnished with slot wedges, and two circumferentially running winding slots one arranged at each end of the rotor and each intended for one coil end, each of said circumferentially running winding slots having toothed walls, and a plurality of slot wedges in each of said circumferentially running winding slots having toothed side surfaces in engagement with the toothed walls of the slots which together absorb at least the greater part of the centrifugal forces acting on a coil end which lies in the slot, said recess having a corner part formed by one end of an axially running winding slot and one end of a circumferentially running winding slot, at least one of said slot ends having an expanded top part dimensioned to permit radial insertion of a slot wedge intended for the remaining part of the winding slot to such a depth that the toothed surfaces of said slot wedge will be on a level with the corresponding toothed walls of the winding slot.
Claim 2
Dependent Claim
256 words
Turbo-generator of the radial slot type of at least 100 MVA and with a speed of at least 1,500 r.p.m., comprising a stator and a rotor surrounded by the stator and having an iron core and a field winding supported by said iron core, the field winding having a plurality of coils per pole, said rotor body having recesses therein of substantially the same form as the coils, each coil being arranged in a corresponding recess, each recess comprising two axially running winding slots, intended for one coil side each and furnished with slot wedges, and two circumferentially running winding slots one arranged at each end of the rotor and each intended for one coil end, each of said circumferentially running winding slots having toothed walls, and a plurality of slot wedges in each of said circumferentially running winding slots having toothed side surfaces in engagement with the toothed walls of the slots which together absorb at least the greater part of the centrifugal forces acting on a coil end which lies in the slot, said recess having a corner part formed by one end of an axially running winding slot and one end of a circumferentially running winding slot, at least one of said slot ends having an expanded top part dimensioned to permit radial insertion of a slot wedge intended for the remaining part of the winding slot to such a depth that the toothed surfaces of said slot wedge will be on a level with the corresponding toothed walls of the winding slot.
Claim 3
Dependent Claim
62 words
Turbo-generator according to claim 1, in which said corner part is formed by enlarged top parts of the slot ends, and a corner slot wedge having a convex corner, said corner and corner wedge sides converging at said corner being formed with toothed surfaces, which are in engagement with each other, and means locking the corner wedge in a position of engagement.
Claim 4
Dependent Claim
228 words
Turbo-generator of the radial slot type of at least 100 MVA and with a speed of at least 1,500 r.p.m., comprising a stator and a rotor surrounded by the stator and having an iron core and a field winding supported by said iron core, the field winding having a plurality of coils per pole, said rotor body having recesses therein of substantially the same form as the coils, each coil being arranged in a corresponding recess, each recess comprising two axially running winding slots, intended for one coil side each and furnished with slot wedges, and two circumferentially running winding slots one arranged at each end of the rotor and each intended for one coil end, each of said circumferentially running winding slots having toothed walls, and a plurality of slot wedges in each of said circumferentially running winding slots having toothed side surfaces in engagement with the toothed walls of the slots which together absorb at least the greater part of the centrifugal forces acting on a coil end which lies in the slot, in which the rotor body comprises a central piece in which the axially running winding slots are contained, and at each end of the central piece a plurality of discs, arranged in radial planes axially one after the other, each of said discs having surfaces constituting two slot walls for circumferentially running slots.
Claim 5
Dependent Claim
228 words
Turbo-generator of the radial slot type of at least 100 MVA and with a speed of at least 1,500 r.p.m., comprising a stator and a rotor surrounded by the stator and having an iron core and a field winding supported by said iron core, the field winding having a plurality of coils per pole, said rotor body having recesses therein of substantially the same form as the coils, each coil being arranged in a corresponding recess, each recess comprising two axially running winding slots, intended for one coil side each and furnished with slot wedges, and two circumferentially running winding slots one arranged at each end of the rotor and each intended for one coil end, each of said circumferentially running winding slots having toothed walls, and a plurality of slot wedges in each of said circumferentially running winding slots having toothed side surfaces in engagement with the toothed walls of the slots which together absorb at least the greater part of the centrifugal forces acting on a coil end which lies in the slot, in which the rotor body comprises a central piece in which the axially running winding slots are contained, and at each end of the central piece a plurality of discs, arranged in radial planes axially one after the other, each of said discs having surfaces constituting two slot walls for circumferentially running slots.
Claim 6
Dependent Claim
21 words
Turbo-generator according to claim 3, in which said central piece comprises a plurality of discs arranged axially one after the other.
Claim 7
Dependent Claim
49 words
Turbo-generator according to claim 3, in which the rotor body at each end of the central piece comprises a plurality of discs of a non-magnetic material, arranged in radial planes axially one after the other, each of said discs having surfaces constituting two slot walls for circumferentially running slots.
References Cited (Backward Citations)
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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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |