Patent US3444451A successfully refreshed from Google Patents.
US3444451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed loop motor control system
Assignee: Westinghouse Electric Corp
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Filing: 1966-08-26
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Granted: 1969-05-13
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Expires: 1986-08-26
Abstract
No abstract record available.
Inventors
- 👤 Leland A Schlabach
- 👤 Laszlo Gyugyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:40
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/525; H02P27/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A SYSTEM FOR SUPPLYING ALTERNATING CURRENT TO AN ELECTRICAL MOTOR BY MEANS OF AN INVERTER CIRCUIT, THE COMBINATION OF MEANS IN A CLOSED LOOP REGULATING SYSTEM FOR GENERATING TWO PULSED WAVEFORMS IN WHICH THE PHASE DIFFERENCE BETWEEN PULSES IN THE TWO WAVEFORMS DETERMINES THE VOLTAGE OUTPUT OF THE INVERTER CIRCUIT, AND MEANS RESPONSIVE TO THE VOLTAGE APPEARING AT THE INPUT TO SAID MOTOR FOR VARYING THE PHASE DIFFERENCE BETWEEN THE PULSES IN THE TWO WAVEFORMS TO THEREBY MAINTAIN THE SUM OF THE INVERTER OUTPUT VOLTAGE AND THE VOLTAGE REGENERATED BY THE MOTOR CONSTANT REGARDLESS OF MOTOR SPEED AND LOAD.
Claim 2
Dependent Claim
100 words
IN A SYSTEM FOR SUPPLYING ALTERNATING CURRENT TO AN ELECTRICAL MOTOR BY MEANS OF AN INVERTER CIRCUIT, THE COMBINATION OF MEANS IN A CLOSED LOOP REGULATING SYSTEM FOR GENERATING TWO PULSED WAVEFORMS IN WHICH THE PHASE DIFFERENCE BETWEEN PULSES IN THE TWO WAVEFORMS DETERMINES THE VOLTAGE OUTPUT OF THE INVERTER CIRCUIT, AND MEANS RESPONSIVE TO THE VOLTAGE APPEARING AT THE INPUT TO SAID MOTOR FOR VARYING THE PHASE DIFFERENCE BETWEEN THE PULSES IN THE TWO WAVEFORMS TO THEREBY MAINTAIN THE SUM OF THE INVERTER OUTPUT VOLTAGE AND THE VOLTAGE REGENERATED BY THE MOTOR CONSTANT REGARDLESS OF MOTOR SPEED AND LOAD.
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) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |