Patent US3331003A successfully refreshed from Google Patents.
US3331003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control systems for electric motors
Assignee: Siemens Mobility Ltd
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Filing: 1963-05-01
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Granted: 1967-07-11
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Expires: 1983-05-01
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:56
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A SPEED CONTROL SYSTEM FOR AN INDUCTION MOTOR, COMPRISING VARIABLE-FREQUENCY SUPPLY MEANS (SI) OPERABLE IN RESPONSE TO THE REPETITION RATE OF A PULSE TRAIN INPUT FOR SUPPLYING POLYPHASE ALTERNATING-CURRENT ENERGY TO SAID MOTOR; CURRENT-SENSING MEANS (R) FOR GENERATING A CONTROL VOLTAGE AS A FUNCTION OF THE CURRENT SUPPLIED TO, AND CONSEQUENTLY THE TORQUE OF, SAID MOTOR; A SOURCE OF MOTOR SPEED REFERENCE VOLTAGE (CS); AND VOLTAGE-RESPONSIVE PULSE GENERATING MEANS (PG) FOR FEEDING TO SAID SUPPLY MEANS A TRAIN OF FREQUENCY CONTROL PULSES THE REPETITION RATE OF WHICH IS A FUNCTION OF THE RESULTANT OF SAID CONTROL VOLTAGE AND SAID REFERENCE VOLTAGE, SAID PULSE GENERATING MEANS INCLUDING OSCILLATOR MEANS.
Claim 2
Dependent Claim
108 words
A SPEED CONTROL SYSTEM FOR AN INDUCTION MOTOR, COMPRISING VARIABLE-FREQUENCY SUPPLY MEANS (SI) OPERABLE IN RESPONSE TO THE REPETITION RATE OF A PULSE TRAIN INPUT FOR SUPPLYING POLYPHASE ALTERNATING-CURRENT ENERGY TO SAID MOTOR; CURRENT-SENSING MEANS (R) FOR GENERATING A CONTROL VOLTAGE AS A FUNCTION OF THE CURRENT SUPPLIED TO, AND CONSEQUENTLY THE TORQUE OF, SAID MOTOR; A SOURCE OF MOTOR SPEED REFERENCE VOLTAGE (CS); AND VOLTAGE-RESPONSIVE PULSE GENERATING MEANS (PG) FOR FEEDING TO SAID SUPPLY MEANS A TRAIN OF FREQUENCY CONTROL PULSES THE REPETITION RATE OF WHICH IS A FUNCTION OF THE RESULTANT OF SAID CONTROL VOLTAGE AND SAID REFERENCE VOLTAGE, SAID PULSE GENERATING MEANS INCLUDING OSCILLATOR MEANS.
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) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |