Patent US1039891A successfully refreshed from Google Patents.
US3355646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optimum driving method for step motors
Assignee: Hitachi Ltd
•
Filing: 1965-04-07
•
Granted: 1967-11-28
•
Expires: 1985-04-07
Abstract
No abstract record available.
Inventors
- 👤 Goto Tatsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:07
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02P8/16; H02P8/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN OPTIMUM DRIVING SYSTEM FOR A STEP MOTOR COMPRISING AN ELECTRIC POWER SOURCE FOR PRODUCING A DRIVING VOLTAGE TO BE APPLIED TO SAID STEP MOTOR FOR EACH PHASE THEREOF, MEANS FOR PRODUCING COMMAND PULSES TO DRIVE SAID STEP MOTOR, MEANS FOR SEQUENTIALLY CHANGING THE EXCITATION OF SAID STEP MOTOR FROM ONE PHASE TO ANOTHER CORRESPONDING TO SAID COMMAND PULSES, AND MEANS RESPONSIVE TO THE COMMAND PULSES FOR RAISING THE VOLTAGE APPLIED FROM THE ELECTRIC POWER SOURCE TO THE STEP MOTOR IN THE HIGH FREQUENCY RANGE OF SAID COMMAND PULSES AND LOWERING THE VOLTAGE IN THE LOW FREQUENCY RANGE OF SAID COMMAND PULSES AND IN THE STOP CONDITION OF SAID STEP MOTOR.
Claim 2
Dependent Claim
111 words
AN OPTIMUM DRIVING SYSTEM FOR A STEP MOTOR COMPRISING AN ELECTRIC POWER SOURCE FOR PRODUCING A DRIVING VOLTAGE TO BE APPLIED TO SAID STEP MOTOR FOR EACH PHASE THEREOF, MEANS FOR PRODUCING COMMAND PULSES TO DRIVE SAID STEP MOTOR, MEANS FOR SEQUENTIALLY CHANGING THE EXCITATION OF SAID STEP MOTOR FROM ONE PHASE TO ANOTHER CORRESPONDING TO SAID COMMAND PULSES, AND MEANS RESPONSIVE TO THE COMMAND PULSES FOR RAISING THE VOLTAGE APPLIED FROM THE ELECTRIC POWER SOURCE TO THE STEP MOTOR IN THE HIGH FREQUENCY RANGE OF SAID COMMAND PULSES AND LOWERING THE VOLTAGE IN THE LOW FREQUENCY RANGE OF SAID COMMAND PULSES AND IN THE STOP CONDITION OF SAID STEP MOTOR.
References Cited (Backward Citations)
US3005118A
Cited
US3165684A
Cited
US3105180A
Cited
US3117268A
Cited
US3268789A
Cited
US3281630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |