US3708707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frame and core-type dynamo-electric machine
Assignee: BBC Brown Boveri AG Switzerland
•
Filing: 1971-05-13
•
Granted: 1973-01-02
•
Expires: 1991-05-13
Abstract
Abstract A turbo-generator structure in which the stator, composed of a stack of laminations, is provided with a plurality of uniformly circumferentially spaced longitudinally extending dove-tailed grooves in which are received complementarily configured longitudinally extending wedges. These wedges are stressed into engagement with the sides of the grooves by means of an arrangement of longitudinally spaced screw bolts mounted in longitudinally extending wedge supports which have a rounded section that bear against an arcuate longitudinally extending recess in the surface of the lamination stack as the bolts are tightened by screwing them into the wedges. Thereafter, the stator assembly is inserted into a surrounding corset and secured in place by welding the wedge supports to the corset.
Inventors
- 👤 R Kranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:58
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/18; H02K1/185
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A stator structure for a dynamo-electric machine comprising a stack of laminations, said laminated stack including circumferentially spaced and longitudinally extending include dove-tailed provided at the periphery thereof and which included dove-tailed portions, dove-tailed wedges located in said grooves and engageable with the dove-tailed portions thereof, longitudinally extending wedge supports seated in said grooves, said wedge supports being of diminishing section in the radial direction towards the axis of the laminated stack to enable them to absorb forces acting in the radial and circumferential directions of the laminated stack, screw bolts extending through said wedge supports into said dove-tailed wedges for drawing said wedges into a tight engagement with their grooves, and spring means located on said bolts between the bolt heads and wedge supports to maintain the bolts under tensional stress.
Claim 2
Dependent Claim
132 words
A stator structure for a dynamo-electric machine comprising a stack of laminations, said laminated stack including circumferentially spaced and longitudinally extending include dove-tailed provided at the periphery thereof and which included dove-tailed portions, dove-tailed wedges located in said grooves and engageable with the dove-tailed portions thereof, longitudinally extending wedge supports seated in said grooves, said wedge supports being of diminishing section in the radial direction towards the axis of the laminated stack to enable them to absorb forces acting in the radial and circumferential directions of the laminated stack, screw bolts extending through said wedge supports into said dove-tailed wedges for drawing said wedges into a tight engagement with their grooves, and spring means located on said bolts between the bolt heads and wedge supports to maintain the bolts under tensional stress.
Claim 3
Dependent Claim
30 words
A stator structure for a dynamo-electric machine as defined in claim 1 wherein said wedges are constructed from a material having an electrical conductivity of at least 10 m/ohm mm2.
Claim 4
Dependent Claim
45 words
A stator structure for a dynamo-electric machine as defined in claim 1 and which further includes a corset surrounding said laminated stack, said corset being provided with circumferentially spaced and longitudinally extending recesses in alignment with and receiving said wedge supports and being welded thereto.
Claim 5
Dependent Claim
31 words
A stator structure for a dynamo-electric machine as defined in claim 1 wherein the diminishing section of said wedge supports in the radially inward direction is established by an arcuate configuration.
Claim 6
Dependent Claim
53 words
A stator structure for a electric machine as defined in claim 1 and which further includes a lock plate for and extending along each of said wedge supports, said lock plate being provided with an aperture at the location of each bolt in which the bolt head is seated to prevent turning thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |