Patent US3564370A successfully refreshed from Google Patents.
US3564370A
Expired / Lapsed
US
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Apparatus for regulating the speed of low speed electric commutator motors through the use of synchronized boosting signals
Assignee: Alcatel Lucent SAS
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Filing: 1968-05-20
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Granted: 1971-02-16
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Expires: 1988-05-20
Abstract
Abstract A DEVICE FOR ELIMINATING THE SPEED FLUCTATION OF LOW SPEED ELECTRIC MOTOR DUE TO THE SIMULTANEOUS PASSAGE OF PLURAL COMMUTATOR SEGMENTS UNDER THE MOTOR''S BRUSHES, WHICH CAUSES THE MOTOR''S IMPEDANCE TO BE PERIODICALLY LOWERED WHICH, IN TURN, CAUSES A FLUCTATION IN INPUT VOLTAGE TO THE MOTOR AND A CORRESPONDING FLUCTUATION IN MOTOR SPEED. THE DEVICE IS COUPLED TO THE MOTOR SHAFT AND ACTS ON THE SUPPLY CURRENT TO THE MOTOR TO PRODUCE A VOLTAGE FLUCTUATION WHICH IS OF THE SAME FREQUENCY AND AMPLITUDE AS THAT DUE TO LOWERED MOTOR IMPEDANCE, AND IN PHASE OPPOSITION THERETO.
Inventors
- 👤 Jean-Michel Catherin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
H; H02; H02K; H02K13/00; H02K13/14; H02K11/00; H02K11/30; H02K11/33; H02K23/00; H02K23/66; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |