US3412302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible direct coupled drive circuit for stepping motors
Assignee: Westinghouse Electric Corp
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Filing: 1966-04-28
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Granted: 1968-11-19
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Expires: 1986-04-28
Abstract
No abstract record available.
Inventors
- 👤 Leonard C Vercellotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:38
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02P8/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A REVERSIBLE DIRECT COUPLED DRIVE FOR A MULTIPHASE STEPPING MOTOR HAVING A PERMANENT MAGNET ROTOR, SAID DRIVE CIRCUIT COMPRISING A POWER SWITCH ASSOCIATED WITH EACH STATOR PHASE WINDING TO CONTROL CURRENT FLOW THEREIN, A MEMORY CIRCUIT RESPONSIVE TO DIGITAL INPUT LOAD PULSES FOR STORING INFORMATION AS TO THE STATE OF EACH OF SAID POWER SWITCHES DURING EACH STEP OF MOTOR OPERATION, MEANS RESPONSIVE TO SAID MEMORY CIRCUIT FOR SEQUENTIALLY OPERATING SAID POWER SWITCHES IN A SELECTABLE ORDER IN RESPONSE TO DIGITAL INPUT ADVANCE PULSES WHICH ARE TIMED TO OCCUR ALTERNATELY WITH AND AFTER THE LOAD PULSES, AND MEANS SUBSTANTIALLY FREE OF CAPACITANCE INTERCONNECTING SAID POWER SWITCHES SO THAT ONE OF SAID POWER SWITCHES IS CONDUCTIVE AND THE OTHER POWER SWITCHES ARE NON-CONDUCTIVE IN EACH MOTOR OPERATING STEP.
Claim 2
Dependent Claim
127 words
A REVERSIBLE DIRECT COUPLED DRIVE FOR A MULTIPHASE STEPPING MOTOR HAVING A PERMANENT MAGNET ROTOR, SAID DRIVE CIRCUIT COMPRISING A POWER SWITCH ASSOCIATED WITH EACH STATOR PHASE WINDING TO CONTROL CURRENT FLOW THEREIN, A MEMORY CIRCUIT RESPONSIVE TO DIGITAL INPUT LOAD PULSES FOR STORING INFORMATION AS TO THE STATE OF EACH OF SAID POWER SWITCHES DURING EACH STEP OF MOTOR OPERATION, MEANS RESPONSIVE TO SAID MEMORY CIRCUIT FOR SEQUENTIALLY OPERATING SAID POWER SWITCHES IN A SELECTABLE ORDER IN RESPONSE TO DIGITAL INPUT ADVANCE PULSES WHICH ARE TIMED TO OCCUR ALTERNATELY WITH AND AFTER THE LOAD PULSES, AND MEANS SUBSTANTIALLY FREE OF CAPACITANCE INTERCONNECTING SAID POWER SWITCHES SO THAT ONE OF SAID POWER SWITCHES IS CONDUCTIVE AND THE OTHER POWER SWITCHES ARE NON-CONDUCTIVE IN EACH MOTOR OPERATING STEP.
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) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |