US3307092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control circuit for a synchronous motor
Assignee: —
•
Filing: —
•
Granted: 1967-02-28
•
Expires: 1984-02-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:13
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A SPEED CONTROL SYSTEM FOR A SYNCHRONOUS MOTOR COMPRISING: A FIXED FREQUENCY OSCILLATOR, A VARIABLE COUNT MULTI-STAGE DIGITAL COUNTER CIRCUIT HAVING ITS INPUT COUPLED TO THE OUTPUT OF SAID OSCILLATOR AND PROVIDING AN OUTPUT PULSE UPON RECEIVING A PREDETERMINED NUMBER OF PULSES AT THE INPUT THEREOF, MEANS COUPLED TO SAID COUNTER CIRCUIT FOR VARYING THE NUMBER OF INPUT PULSES REQUIRED TO PRODUCE AN OUTPUT PULSE INCLUDING A FEEDBACK CONTROL CIRCUIT HAVING ONE END CONNECTED TO THE OUTPUT OF ONE STAGE IN SAID COUNTER AND SWITCHING MEANS FOR SELECTIVELY CONNECTING THE OTHER END OF SAID FEEDBACK CONTROL CIRCUIT TO ONE OF A PLURALITY OF PRECEDING COUNTER STAGES FOR VARYING THE OUTPUT FREQUENCY OF SAID COUNTER CIRCUIT AS SAID OTHER END OF SAID FEEDBACK CONTROL CIRCUIT IS SWITCHED FROM ONE COUNTER STAGE TO ANOTHER COUNTER STAGE, AND MEANS COUPLING THE OUTPUT OF SAID COUNTER CIRCUIT TO A SYNCHRONOUS MOTOR WHEREBY AN INCREASE IN OUTPUT FREQUENCY OF SAID COUNTER CIRCUIT MAY BE EMPLOYED TO INCREASE THE SPEED OF SAID SYNCHRONOUS MOTOR TO ITS SYNCHRONOUS SPEED.
Claim 2
Dependent Claim
172 words
A SPEED CONTROL SYSTEM FOR A SYNCHRONOUS MOTOR COMPRISING: A FIXED FREQUENCY OSCILLATOR, A VARIABLE COUNT MULTI-STAGE DIGITAL COUNTER CIRCUIT HAVING ITS INPUT COUPLED TO THE OUTPUT OF SAID OSCILLATOR AND PROVIDING AN OUTPUT PULSE UPON RECEIVING A PREDETERMINED NUMBER OF PULSES AT THE INPUT THEREOF, MEANS COUPLED TO SAID COUNTER CIRCUIT FOR VARYING THE NUMBER OF INPUT PULSES REQUIRED TO PRODUCE AN OUTPUT PULSE INCLUDING A FEEDBACK CONTROL CIRCUIT HAVING ONE END CONNECTED TO THE OUTPUT OF ONE STAGE IN SAID COUNTER AND SWITCHING MEANS FOR SELECTIVELY CONNECTING THE OTHER END OF SAID FEEDBACK CONTROL CIRCUIT TO ONE OF A PLURALITY OF PRECEDING COUNTER STAGES FOR VARYING THE OUTPUT FREQUENCY OF SAID COUNTER CIRCUIT AS SAID OTHER END OF SAID FEEDBACK CONTROL CIRCUIT IS SWITCHED FROM ONE COUNTER STAGE TO ANOTHER COUNTER STAGE, AND MEANS COUPLING THE OUTPUT OF SAID COUNTER CIRCUIT TO A SYNCHRONOUS MOTOR WHEREBY AN INCREASE IN OUTPUT FREQUENCY OF SAID COUNTER CIRCUIT MAY BE EMPLOYED TO INCREASE THE SPEED OF SAID SYNCHRONOUS MOTOR TO ITS SYNCHRONOUS SPEED.
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |