US3218538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control apparatus
Assignee: Honeywell Inc
•
Filing: 1960-06-07
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Granted: 1965-11-16
•
Expires: 1980-06-07
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Sear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:18
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A CONTROL SYSTEM, THE COMBINATION COMPRISING: MEANS FOR GENERATING FIRST SIGNALS OF A FREQUENCY PROPORTIONAL TO THE DESIRED SPEED OF AN OUTPUT SHAFT; MEANS ASSOCIATED WITH SAID OUTPUT SHAFT FOR GENERATING SECOND SIGNALS OF A FREQUENCY PROPORTIONAL TO THE ACTUAL SPEED OF SAID SHAFT; CIRCUIT MEANS FOR COMPARING SAID FIRST AND SECOND SIGNALS AND FOR PRODUCING A FIRST ERROR SIGNAL PROPORTIONAL TO THE DIFFERENCE IN FREQUENCY BETWEEN SAID FIRST AND SECOND SIGNALS; CIRCUIT MEANS FOR COMPARING THE PHASE BETWEEN SAID FIRST AND SECOND SIGNALS WHEN SAID FIRST ERROR SIGNAL IS SMALL AND FOR PRODUCING A SECOND ERROR SIGNAL PROPORTIONAL TO THE DIFFERENCE IN PHASE BETWEEN SAID FIRST AND SECOND SIGNALS; MEANS RESPONSIVE TO SAID FIRST AND SECOND ERROR SIGNALS FOR CONTROLLING THE FREQUENCY OF POWER OSCILLATOR MEANS; AND SYNCHRONOUS MOTOR MEANS CONNECTED TO SAID POWER OSCILLATOR MEANS FOR DRIVING SAID OUTPUT SHAFT, THE ARRANGEMENT BEING SUCH THAT SAID FIRST AND SAID SIGNALS TEND TO ASSUME A PREDETERMINED FREQUENCY RELATIONSHIP.
Claim 2
Dependent Claim
160 words
IN A CONTROL SYSTEM, THE COMBINATION COMPRISING: MEANS FOR GENERATING FIRST SIGNALS OF A FREQUENCY PROPORTIONAL TO THE DESIRED SPEED OF AN OUTPUT SHAFT; MEANS ASSOCIATED WITH SAID OUTPUT SHAFT FOR GENERATING SECOND SIGNALS OF A FREQUENCY PROPORTIONAL TO THE ACTUAL SPEED OF SAID SHAFT; CIRCUIT MEANS FOR COMPARING SAID FIRST AND SECOND SIGNALS AND FOR PRODUCING A FIRST ERROR SIGNAL PROPORTIONAL TO THE DIFFERENCE IN FREQUENCY BETWEEN SAID FIRST AND SECOND SIGNALS; CIRCUIT MEANS FOR COMPARING THE PHASE BETWEEN SAID FIRST AND SECOND SIGNALS WHEN SAID FIRST ERROR SIGNAL IS SMALL AND FOR PRODUCING A SECOND ERROR SIGNAL PROPORTIONAL TO THE DIFFERENCE IN PHASE BETWEEN SAID FIRST AND SECOND SIGNALS; MEANS RESPONSIVE TO SAID FIRST AND SECOND ERROR SIGNALS FOR CONTROLLING THE FREQUENCY OF POWER OSCILLATOR MEANS; AND SYNCHRONOUS MOTOR MEANS CONNECTED TO SAID POWER OSCILLATOR MEANS FOR DRIVING SAID OUTPUT SHAFT, THE ARRANGEMENT BEING SUCH THAT SAID FIRST AND SAID SIGNALS TEND TO ASSUME A PREDETERMINED FREQUENCY RELATIONSHIP.
References Cited (Backward Citations)
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Cited
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US2866143A
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US3110853A
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US3089061A
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |