US3144594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for alternating current dynamoelectric machines
Assignee: Lear Siegler Inc
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Filing: 1961-02-27
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Granted: 1964-08-11
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Expires: 1981-02-27
Abstract
No abstract record available.
Inventors
- 👤 Troy D Graybeal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:04
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN AN APPARATUS FOR CONTROLLING THE DIRECTION AND SPEED OF ROTATION OF THE MAGNETIC FIELD FOR AN ALTERNATING CURRENT MACHINE HAVING AN ARMATURE AND A POLYPHASE FIELD WINDING THE COMBINATION WHICH COMPRISES A SOURCE OF CONTROL SIGNALS, AN AUXILIARY FREQUENCY SIGNAL GENERATOR, CONTROL MEANS COUPLED BETWEEN THE SOURCE OF CONTROL SIGNALS, THE AUXILIARY FREQUENCY SIGNAL GENERATOR AND THE ALTERNATING CURRENT MACHINE FOR PRODUCING FIRST AND SECOND ALTERNATING CURRENT AMPLITUDE UNMODULATED COMMAND SIGNALS HAVING A FREQUENCY DIFFERENCE REPRESENTATIVE OF THE SLIP FREQUENCY OF THE ALTERNATING CURRENT MACHINE, EACH OF THE FIRST AND SECOND COMMAND SIGNALS HAVING THE AUXILIARY FREQUENCY SIGNAL AS ONE COMPONENT THEREOF SO THAT THE AUXILIARY FREQUENCY SIGNAL CANCELS OUT WHEN THE ALGEBRAIC DIFFERENCE OF THE FIRST AND SECOND COMMAND SIGNALS IS OBTAINED, MEANS FOR OBTAINING THE ALGEBRAIC DIFFERENCE OF THE FIRST AND SECOND COMMAND SIGNALS TO PROVIDE A POLYPHASE SLIP FREQUENCY SIGNAL AND MEANS FOR APPLYING THE POLYPHASE SLIP FREQUENCY SIGNAL TO THE FIELD WINDINGS OF THE ALTERNATING CURRENT MACHINE.
Claim 2
Dependent Claim
162 words
IN AN APPARATUS FOR CONTROLLING THE DIRECTION AND SPEED OF ROTATION OF THE MAGNETIC FIELD FOR AN ALTERNATING CURRENT MACHINE HAVING AN ARMATURE AND A POLYPHASE FIELD WINDING THE COMBINATION WHICH COMPRISES A SOURCE OF CONTROL SIGNALS, AN AUXILIARY FREQUENCY SIGNAL GENERATOR, CONTROL MEANS COUPLED BETWEEN THE SOURCE OF CONTROL SIGNALS, THE AUXILIARY FREQUENCY SIGNAL GENERATOR AND THE ALTERNATING CURRENT MACHINE FOR PRODUCING FIRST AND SECOND ALTERNATING CURRENT AMPLITUDE UNMODULATED COMMAND SIGNALS HAVING A FREQUENCY DIFFERENCE REPRESENTATIVE OF THE SLIP FREQUENCY OF THE ALTERNATING CURRENT MACHINE, EACH OF THE FIRST AND SECOND COMMAND SIGNALS HAVING THE AUXILIARY FREQUENCY SIGNAL AS ONE COMPONENT THEREOF SO THAT THE AUXILIARY FREQUENCY SIGNAL CANCELS OUT WHEN THE ALGEBRAIC DIFFERENCE OF THE FIRST AND SECOND COMMAND SIGNALS IS OBTAINED, MEANS FOR OBTAINING THE ALGEBRAIC DIFFERENCE OF THE FIRST AND SECOND COMMAND SIGNALS TO PROVIDE A POLYPHASE SLIP FREQUENCY SIGNAL AND MEANS FOR APPLYING THE POLYPHASE SLIP FREQUENCY SIGNAL TO THE FIELD WINDINGS OF THE ALTERNATING CURRENT MACHINE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |