Patent US3793546A successfully refreshed from Google Patents.
US3793546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for dynamoelectric machines
Assignee: Westinghouse Electric Corp
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Filing: 1973-02-05
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Granted: 1974-02-19
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Expires: 1993-02-05
Abstract
Abstract A synchronous dynamoelectric machine having a salient pole rotor with a damper winding including bars of magnetic material such as steel. In order to minimize losses and heating in the stator winding end regions due to radial leakage flux, the end portions of the damper bars and the short-circuiting end rings, and preferably also the pole end plates, are made of non-magnetic material.
Inventors
- 👤 E King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:21
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/18; H02K3/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
A dynamoelectric machine having a stator member and a rotor member, said stator member having a magnetic core and a stator winding disposed in slots in the core, said winding having end turn portions extending beyond the core, said rotor member including a plurality of salient pole members having pole faces, a damper winding on the rotor member, said damper winding including damper bars in said pole faces and end portions extending beyond the pole members under said stator winding end turn portions, the central portion of said damper bars in the pole faces being solid bars made solely of magnetic material and the end portions of the damper winding comprising solid members made solely of non-magnetic material.
Claim 2
Dependent Claim
118 words
A dynamoelectric machine having a stator member and a rotor member, said stator member having a magnetic core and a stator winding disposed in slots in the core, said winding having end turn portions extending beyond the core, said rotor member including a plurality of salient pole members having pole faces, a damper winding on the rotor member, said damper winding including damper bars in said pole faces and end portions extending beyond the pole members under said stator winding end turn portions, the central portion of said damper bars in the pole faces being solid bars made solely of magnetic material and the end portions of the damper winding comprising solid members made solely of non-magnetic material.
Claim 3
Dependent Claim
32 words
A dynamoelectric machine as defined in claim 1 in which said end portions of the damper winding include end extensions of the damper bars and short-circuiting end rings connecting the damper bars.
Claim 4
Dependent Claim
20 words
A dynamoelectric machine as defined in claim 1 and including non-magnetic end plates at each end of the pole members.
Claim 5
Dependent Claim
41 words
A dynamoelectric machine as defined in claim 1 in which the central portion of each of said damper bars in the pole faces is made of magnetic steel and the end portions of the damper winding are made of stainless steel.
Claim 6
Dependent Claim
113 words
A rotor member for a dynamoelectric machine comprising a rotatable member, a plurality of salient pole members on said member, each of said pole members having a body portion and a pole face portion, a plurality of damper bars disposed in slots in said pole face portion, each of said damper bars having a central portion and having end portions extending beyond the pole members, and short-circuiting end rings connecting the end portions of all the damper bars, the central portions of the damper bars being solid bars made solely of magnetic material and the end portions of the damper bars and the end rings being solid members made solely of non-magnetic material.
Claim 7
Dependent Claim
113 words
A rotor member for a dynamoelectric machine comprising a rotatable member, a plurality of salient pole members on said member, each of said pole members having a body portion and a pole face portion, a plurality of damper bars disposed in slots in said pole face portion, each of said damper bars having a central portion and having end portions extending beyond the pole members, and short-circuiting end rings connecting the end portions of all the damper bars, the central portions of the damper bars being solid bars made solely of magnetic material and the end portions of the damper bars and the end rings being solid members made solely of non-magnetic material.
Claim 8
Dependent Claim
21 words
A rotor member as defined in claim 5 in which each pole member includes non-magnetic end plates at each end thereof.
Claim 9
Dependent Claim
39 words
A rotor member as defined in claim 5 in which the central portions of the damper bars are made of magnetic steel and the end portions of the damper bars and the end rings are made of stainless steel.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |