US3238432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control apparatus
Assignee: Unisys Corp
•
Filing: 1962-03-09
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Granted: 1966-03-01
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
- 👤 Donald J Amberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:13
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/06; G01C19/08; H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024; H02P9/00; H02P9/10; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1282
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A SYNCHRONOUS MOTOR EXCITATION CIRCUIT COMPRISING MEANS PROVIDING ALTERNATING EXCITATION VOLTAGES, SUMMING MEANS, MEANS OPERABLE WITH A FIELD WINDING OF SAID MOTOR TO PRODUCE AN ALTERNATING VOLTAGE REPRESENTATIVE OF AN ALTERNATING CURRENT COMPONENT IN THAT WINDING HAVING A FREQUENCY SUBSTANTIALLY LESS THAN THE FREQUENCY OF THE EXCITATION VOLTAGES, AND MEANS ATTENUATING THE CURRENT COMPONENT REPRESENTATIVE VOLTAGE, SAID ATTENUATED VOLTAGE BEING APPLIED TO SAID SUMMING MEANS TOGETHER WITH ONE OF SAID EXCITATION VOLTAGES TO PRODUCE A RESULTANT VOLTAGE THAT VARIES WHEN THE FIELD WINDING IMPEDANCES VARY TO KEEP THE CURRENT DRAWN BY THE MOTOR SUBSTANTIALLY INVARIANT, SAID SUMMING MEANS RESULTANT VOLTAGE BEING APPLIED TO EXCITE SAID MOTOR.
Claim 2
Dependent Claim
106 words
A SYNCHRONOUS MOTOR EXCITATION CIRCUIT COMPRISING MEANS PROVIDING ALTERNATING EXCITATION VOLTAGES, SUMMING MEANS, MEANS OPERABLE WITH A FIELD WINDING OF SAID MOTOR TO PRODUCE AN ALTERNATING VOLTAGE REPRESENTATIVE OF AN ALTERNATING CURRENT COMPONENT IN THAT WINDING HAVING A FREQUENCY SUBSTANTIALLY LESS THAN THE FREQUENCY OF THE EXCITATION VOLTAGES, AND MEANS ATTENUATING THE CURRENT COMPONENT REPRESENTATIVE VOLTAGE, SAID ATTENUATED VOLTAGE BEING APPLIED TO SAID SUMMING MEANS TOGETHER WITH ONE OF SAID EXCITATION VOLTAGES TO PRODUCE A RESULTANT VOLTAGE THAT VARIES WHEN THE FIELD WINDING IMPEDANCES VARY TO KEEP THE CURRENT DRAWN BY THE MOTOR SUBSTANTIALLY INVARIANT, SAID SUMMING MEANS RESULTANT VOLTAGE BEING APPLIED TO EXCITE SAID MOTOR.
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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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |