Patent US3383575A successfully refreshed from Google Patents.
US3383575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excitation systems
Assignee: Westinghouse Electric Corp
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Filing: 1966-01-07
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Granted: 1968-05-14
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Expires: 1986-01-07
Abstract
No abstract record available.
Inventors
- 👤 Powell O Bobo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:06
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
219 words
AN EXCITATION SYSTEM COMPRISING A SYNCHRONOUS MOTOR HAVING A FIELD WINDING AND INPUT TERMINALS, A SOURCE OF ALTERNATING POTENTIAL CONNECTED TO THE INPUT TERMINALS OF SAID SYNCHRONOUS MOTOR, A SOURCE OF DIRECT CURRENT POTENTIAL CONNECTED TO SAID FIELD WINDING, CONTROL MEANS CONNECTED IN CIRCUIT RELATION WITH SAID SOURCE OF DIRECT CURRENT POTENTIAL AND SAID FIELD WINDING, FIRST REGULATOR MEANS CONNECTED IN CIRCUIT RELATION WITH SAID SYNCHRONOUS MOTOR AND PROVIDING A FIRST SIGNAL RESPONSIVE TO THE DEVIATION OF THE ELECTRICAL POWER FACTOR OF SAID SYNCHRONOUS MOTOR FROM A PREDETERMINED VALUE, SECOND REGULATOR MEANS CONNECTED IN CIRCUIT RELATION WITH SAID SOURCE OF ALTERNATING POTENTIAL AND PROVIDING A SECOND SIGNAL RESPONSIVE TO THE DEVIATION OF A PREDETERMINED ELECTRICAL QUANTITY FROM A PREDETERMINED VALUE, AUCTIONEERING MEANS CONNECTED IN CIRCUIT RELATION WITH SAID FIRST AND SECOND REGULATOR MEANS AND SAID CONTROL MEANS, SAID AUCTIONEERING MEANS APPLYING THE LARGER OF THE FIRST AND SECOND SIGNALS TO SAID CONTROL MEANS, SAID CONTROL MEANS CONTROLLING THE MAGNITUDE OF CURRENT FLOWING IN SAID FIELD WINDING IN RESPONSE TO THE SIGNAL APPLIED THERETO BY SAID AUCTIONEERING MEANS, SAID FIRST SIGNAL BEING LARGER THAN SAID SECOND SIGNAL WHEN THE LOAD ON SAID SYNCHRONOUS MOTOR REACHES A PREDETERMINED MAGNITUDE, AND THE SECOND SIGNAL BEING LARGER THAN THE FIRST SIGNAL WHEN THE LOAD ON THE SYNCHRONOUS MOTOR IS BELOW THE PREDETERMINED MAGNITUDE.
Claim 2
Dependent Claim
219 words
AN EXCITATION SYSTEM COMPRISING A SYNCHRONOUS MOTOR HAVING A FIELD WINDING AND INPUT TERMINALS, A SOURCE OF ALTERNATING POTENTIAL CONNECTED TO THE INPUT TERMINALS OF SAID SYNCHRONOUS MOTOR, A SOURCE OF DIRECT CURRENT POTENTIAL CONNECTED TO SAID FIELD WINDING, CONTROL MEANS CONNECTED IN CIRCUIT RELATION WITH SAID SOURCE OF DIRECT CURRENT POTENTIAL AND SAID FIELD WINDING, FIRST REGULATOR MEANS CONNECTED IN CIRCUIT RELATION WITH SAID SYNCHRONOUS MOTOR AND PROVIDING A FIRST SIGNAL RESPONSIVE TO THE DEVIATION OF THE ELECTRICAL POWER FACTOR OF SAID SYNCHRONOUS MOTOR FROM A PREDETERMINED VALUE, SECOND REGULATOR MEANS CONNECTED IN CIRCUIT RELATION WITH SAID SOURCE OF ALTERNATING POTENTIAL AND PROVIDING A SECOND SIGNAL RESPONSIVE TO THE DEVIATION OF A PREDETERMINED ELECTRICAL QUANTITY FROM A PREDETERMINED VALUE, AUCTIONEERING MEANS CONNECTED IN CIRCUIT RELATION WITH SAID FIRST AND SECOND REGULATOR MEANS AND SAID CONTROL MEANS, SAID AUCTIONEERING MEANS APPLYING THE LARGER OF THE FIRST AND SECOND SIGNALS TO SAID CONTROL MEANS, SAID CONTROL MEANS CONTROLLING THE MAGNITUDE OF CURRENT FLOWING IN SAID FIELD WINDING IN RESPONSE TO THE SIGNAL APPLIED THERETO BY SAID AUCTIONEERING MEANS, SAID FIRST SIGNAL BEING LARGER THAN SAID SECOND SIGNAL WHEN THE LOAD ON SAID SYNCHRONOUS MOTOR REACHES A PREDETERMINED MAGNITUDE, AND THE SECOND SIGNAL BEING LARGER THAN THE FIRST SIGNAL WHEN THE LOAD ON THE SYNCHRONOUS MOTOR IS BELOW THE PREDETERMINED MAGNITUDE.
References Cited (Backward Citations)
US3100279A
Cited
US3350613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |