US4806812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating-current electrical generator
Assignee: Dowty Fuel Systems Ltd
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Filing: 1984-11-06
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Granted: 1989-02-21
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Expires: 2004-11-06
Abstract
Abstract An alternating-current electrical generator including a permanent magnet rotor, a toothed stator and at least two non-overlapping windings associated with the teeth of the stator. Each winding is substantially similar to but independent of the other winding or windings. An end of each winding is separated from an adjacent end of an adjacent winding by at least one tooth having thereon a short-circuited low-resistance winding. g
Inventors
- 👤 John M. Masterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:45
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/12; H02K3/16; H02K21/00; H02K21/12; H02K21/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
An alternating-current electrical generator including a permanent magnet rotor, a stator having a plurality of teeth, and at least two similar but independent windings associated with the teeth of the stator; each winding has an end which is separated from an adjacent end of an adjacent winding by at least one non wound tooth wherein each non wound tooth is provided with at least one metallic short-circuited winding, independent from the windings of the generator, for reducing the iron losses.
Claim 2
Dependent Claim
80 words
An alternating-current electrical generator including a permanent magnet rotor, a stator having a plurality of teeth, and at least two similar but independent windings associated with the teeth of the stator; each winding has an end which is separated from an adjacent end of an adjacent winding by at least one non wound tooth wherein each non wound tooth is provided with at least one metallic short-circuited winding, independent from the windings of the generator, for reducing the iron losses.
Claim 3
Dependent Claim
24 words
A generator as claimed in claim 1, in which said at least one metallic ring short-circuited winding is said ring is made of copper.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |