US4118648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Salient pole of a synchronous electric machine
Assignee: Societe Generale de Constructions Electriques et Mecaniques
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Filing: 1976-10-28
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Granted: 1978-10-03
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Expires: 1996-10-28
Abstract
Abstract The invention concerns salient poles of synchronous electric machines. It characterized in that the pole shoe of these poles is solid, whereas the polar body is deformable and can follow the thermal expansions of the pole shoe. It is applied to synchronous machines which can start up as asynchronous motors.
Inventors
- 👤 Roger Gillet
- 👤 Jean Allegre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:41
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/18; H02K3/20; H02K1/00; H02K1/06; H02K1/08; H02K1/22; H02K1/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
In a salient pole of a synchronous electric machine, said salient pole comprising: a radially internal polar body and a radially external polar shoe in the form of a single block, said block being formed of an axial stack of metal sheets, each sheet having integrally, a radially internal portion and a radially external portion, clamping means for axially clamping the metal sheets together, the radially external portion of said metal sheets being metal welded together to form an electrically conductive pole shoe, the improvement wherein said clamping means are disposed at the radially internal portion of said sheets with said sheets being unclamped between said radially internal and radially external portions and the portion of said sheets between said radially internal and radially external portions being of reduced axial thickness to form a shallow hollowed out portion extending between said radially internal portion and said pole shoe.
Claim 2
Dependent Claim
148 words
In a salient pole of a synchronous electric machine, said salient pole comprising: a radially internal polar body and a radially external polar shoe in the form of a single block, said block being formed of an axial stack of metal sheets, each sheet having integrally, a radially internal portion and a radially external portion, clamping means for axially clamping the metal sheets together, the radially external portion of said metal sheets being metal welded together to form an electrically conductive pole shoe, the improvement wherein said clamping means are disposed at the radially internal portion of said sheets with said sheets being unclamped between said radially internal and radially external portions and the portion of said sheets between said radially internal and radially external portions being of reduced axial thickness to form a shallow hollowed out portion extending between said radially internal portion and said pole shoe.
Claim 3
Dependent Claim
30 words
The salient pole according to claim 1, wherein said metal sheets bear, at their periphery, at least one metallic coating forming at least a part of the solid pole shoe.
Claim 4
Dependent Claim
16 words
The salient pole according to claim 2, wherein said metallic coating comprises an electric arc deposit.
Claim 5
Dependent Claim
15 words
The salient pole according to claim 2, wherein said metallic coating comprises a metal spray.
Claim 6
Dependent Claim
15 words
The salient pole according to claim 2, wherein said metallic coating comprises an electrolytic deposit.
Claim 7
Dependent Claim
31 words
The salient pole according to claim 1, wherein said metal sheets comprise radial slots extending from the pole shoe to holes situated in the radially internal portion of said metal sheets.
Claim 8
Dependent Claim
26 words
The salient pole according to claim 6, wherein said holes carry clamping rods for clamping the stack of metal sheets together and forming said clamping means.
Claim 9
Dependent Claim
37 words
The salient pole according to claim 1, wherein the stack of metal sheets at each side have recesses under the axial ends of the pole shoe and said recesses carry circumferential connections for electrically linking the poles.
References Cited (Backward Citations)
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Cited
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Cited
US3849683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |