Patent US3080247A successfully refreshed from Google Patents.
Patent US3629684A successfully refreshed from Google Patents.
US3629684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply wherein star-connected windings are arranged to produce fields mechanically coincident and electrically out of phase
Assignee: Lucas Aerospace Power Equipment Corp
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Filing: 1970-10-23
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Granted: 1971-12-21
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Expires: 1990-10-23
Abstract
Abstract A power supply comprising a polyphase source of higher frequency alternating current and a rectifying system connected to it for providing a single-phase output of a lower frequency alternating current and/or unidirectional current of one or both polarities. The polyphase source has output windings arranged in a manner to increase the degree of utilization of the core by minimizing the net magnetomotive forces produced by large unidirectional current components present in the windings and tending to saturate the core.
Inventors
- 👤 Roland W Christen
- 👤 John C Guyeska
- 👤 Gerald H Horstman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:34
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A power supply sysTem comprising a polyphase source of alternating current of higher frequency having star-connected output windings on a stator core of magnetic material, a plurality of rectifying devices connected to the output windings of said alternator to provide a single-phase system output of lower frequency, and including a group of rectifying devices connected to permit current flow in the same direction from all of said output windings with respect to their common connection, one-half of said phase windings being circumferentially spaced about said stator core to provide a first set of fields displaced both mechanically and in electrical phase relationship, and the other half of said phase windings being circumferentially spaced about said stator core to provide a second set of fields comprising a field mechanically coincident and electrically out of phase with each field of said first set.
Claim 2
Dependent Claim
141 words
A power supply sysTem comprising a polyphase source of alternating current of higher frequency having star-connected output windings on a stator core of magnetic material, a plurality of rectifying devices connected to the output windings of said alternator to provide a single-phase system output of lower frequency, and including a group of rectifying devices connected to permit current flow in the same direction from all of said output windings with respect to their common connection, one-half of said phase windings being circumferentially spaced about said stator core to provide a first set of fields displaced both mechanically and in electrical phase relationship, and the other half of said phase windings being circumferentially spaced about said stator core to provide a second set of fields comprising a field mechanically coincident and electrically out of phase with each field of said first set.
Claim 3
Dependent Claim
29 words
The system according to claim 1 in which the higher frequency of said alternating-current source is no less than about three times the lower frequency of said system output.
Claim 4
Dependent Claim
24 words
The system according to claim 1 in which mechanically coincident fields of said first and second sets are electrically out of phase by 180*.
Claim 5
Dependent Claim
55 words
The system according to claim 3 in which said polyphase output windings are disposed in circumferentially spaced stator slots in the stator core, each phase winding occupying 2/n of the total stator slots, where ''''n'''' is the number of output phase windings, the pairs of windings providing said mechanically coincident fields occupying the same slots.
Claim 6
Dependent Claim
46 words
The system according to claim 1 in which said plurality of rectifying devices comprises a first and a second group connected to permit current flow in one direction and in the other direction, respectively, from all of said output windings with respect to their common connection.
Claim 7
Dependent Claim
35 words
The system according to claim 5 in which said source of alternating current comprises an alternator having six-phase output windings and said plurality of rectifying devices are controlled rectifiers arranged as a duplex six-phase cycloconverter.
Claim 8
Dependent Claim
52 words
The system according to claim 6 in which said output windings are disposed in circumferentially spaced stator slots in the stator core, each of said windings occupying one-third of said slots, the pairs of windings providing said mechanically coincident fields occupying the same slots and being electrically out of phase by 180*.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |