Patent US3308362A successfully refreshed from Google Patents.
US3308362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous motor control circuit
Assignee: Allis Chalmers Corp
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Filing: 1964-07-16
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Granted: 1967-03-07
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Expires: 1984-07-16
Abstract
No abstract record available.
Inventors
- 👤 Manfred E Neumann
- 👤 Han Bui Chiem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:09
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A CONTROL FOR SWITCHING THE CIRCUIT OF A SYNCHRONOUS MOTOR FIELD WINDING AND ITS EXCITER FROM A SUBSYNCHRONOUS ACCELERATING STATE TO A SYNCHRONOUS OPERATING STATE WHEN THE MOTOR ROTOR HAS REACHED A SYNCHRONIZING SPEED AND HAS REACHED A PREDETERMINED ANGULAR POSITION WITH RESPECT TO THE ROTATING M.M.F. OF THE MOTOR ARMATURE, COMPRISING, MEANS FOR PROVIDING AN ELECTRICAL SIGNAL ALTERNATING IN POLARITY WITH CHANGES IN THE POSITION OF THE FIELD WINDING WITH RESPECT TO THE ARMATURE, M.M.F. AN OSCILLATOR HAVING A PERIOD THAT IS SLIGHTLY LESS THAN THE HALF PERIOD OF SAID POLARITY VARYING SIGNAL WHEN THE MOTOR HAS REACHED THE MINIMUM RANGE OF SYNCHRONIZING SPEED VALUES, MEANS CONNECTED TO RECEIVE THE POLARITY VARYING SIGNAL AND TO CONTROL SAID OSCILLATOR TO BEGIN A PERIOD IN RESPONSE TO ONLY A PREDETERMINED POLARITY OR ZERO VALUE OF SAID SIGNAL, WHEREBY SAID OSCILLATOR COMPLETES A PERIOD ONLY WHEN SAID MOTOR HAS REACHED SYNCHRONIZING SPEED,
Claim 2
Dependent Claim
150 words
A CONTROL FOR SWITCHING THE CIRCUIT OF A SYNCHRONOUS MOTOR FIELD WINDING AND ITS EXCITER FROM A SUBSYNCHRONOUS ACCELERATING STATE TO A SYNCHRONOUS OPERATING STATE WHEN THE MOTOR ROTOR HAS REACHED A SYNCHRONIZING SPEED AND HAS REACHED A PREDETERMINED ANGULAR POSITION WITH RESPECT TO THE ROTATING M.M.F. OF THE MOTOR ARMATURE, COMPRISING, MEANS FOR PROVIDING AN ELECTRICAL SIGNAL ALTERNATING IN POLARITY WITH CHANGES IN THE POSITION OF THE FIELD WINDING WITH RESPECT TO THE ARMATURE, M.M.F. AN OSCILLATOR HAVING A PERIOD THAT IS SLIGHTLY LESS THAN THE HALF PERIOD OF SAID POLARITY VARYING SIGNAL WHEN THE MOTOR HAS REACHED THE MINIMUM RANGE OF SYNCHRONIZING SPEED VALUES, MEANS CONNECTED TO RECEIVE THE POLARITY VARYING SIGNAL AND TO CONTROL SAID OSCILLATOR TO BEGIN A PERIOD IN RESPONSE TO ONLY A PREDETERMINED POLARITY OR ZERO VALUE OF SAID SIGNAL, WHEREBY SAID OSCILLATOR COMPLETES A PERIOD ONLY WHEN SAID MOTOR HAS REACHED SYNCHRONIZING SPEED,
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |