D.c. servo system including an a.c. motor
Abstract
Abstract A SERVOSYSTEM INCLUDING AN AC (ALTERNATING CURRENT) INDUCTION MOTOR, DESIGNED FOR ASYNCHRONOUS OPERATION, AND A DC (DIRECT CURRENT) TO AN AC INVERTER FOR DRIVING THE MOTOR IN RESPONSE TO A DC POTENTIAL, A CURRENT REGULATOR FOR CONTROLLING THE POTENTIAL AND A CLOSED LOOP CIRCUIT CONNECTED WITH THE OUTPUT OF THE MOTOR FOR DETECTING DEVIATION IN MOTOR SPEED, RELATIVE TO A PRESELECTED SPEED, AND A CIRCUIT FOR CONTROLLING THE CURRENT REGULATOR IN RESPONSE TO DETECTED DEVIATIONS, WHEREBY THE SLOW SPEED CHARACTERISTICS OF A DC MOTOR AND A SMOOTH TORQUE CHARACTERISTIC OF AN AC ASYNCHRONOUS MOTOR ARE COMBINED TO PROVIDE A VARIABLE SPEED SYSTEM HAVING A CAPABILITY FOR ACHIEVING AND MAINTAINING SMOOTH TORQUE OUTPUTS AT SELECTED SPEEDS, IN THE ABSENCE OF SPEED REDUCTION GEAR TRAINS AND THE LIKE. D R A W I N G
Inventors
- 👤 Edmund J Bahm
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |