Patent FR795562A successfully refreshed from Google Patents.
Patent US3197679A successfully refreshed from Google Patents.
US3197679A
Expired / Lapsed
US
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Speed stability apparatus for synchronous motor
Assignee: Muirhead and Co Ltd
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Filing: 1963-01-23
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Granted: 1965-07-27
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Expires: 1983-01-23
Abstract
No abstract record available.
Inventors
- 👤 Phillips Eric Thomas Arthur
- 👤 Banks Derek Francis
- 👤 Kirchel Allen Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:43
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/0016; H02P29/0022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
AN ARRANGEMENT FOR AT LEAST PARTIALLY ELIMINATING UNDESIRED FLUCTUATIONS IN THE ANGULAR VELOCITY OF ROTATING APPARATUS, COMPRISING A SYNCHRONOUS ELECTRIC MOTOR DRIVABLY CONNECTED TO THE ROTATING APPARATUS, A SHAFT ROTATING WITH SAID APPARATUS, ELECTROMAGNETIC BRAKE MEANS ACTING ON SAID SHAFT AND ARRANGED TO APPLY A CONTINUOUS BRAKING TORQUE THERETO, A WINDING IN THE SAID MOTOR, AN ELECTRIC CIRCUIT INCLUDING SAID WINDING, SENSING MEANS IN THE SAID CIRCUIT TO DETECT FLUCTUATIONS IN THE CURRENT FLOWING IN SAID WINDING, AND CONTROL MEANS FOR PRODUCING AN OUTPUT SIGNAL DERIVED FROM THE AVERAGE OF THE FLUCTUATIONS SENSED BY THE SENSING MEANS AND FOR APPLYING THE SAID OUTPUT SIGNAL TO SAID BRAKING MEANS TO VARY THE BRAKING TORQUE APPLIED THEREBY TO SAID SHAFT.
Claim 2
Dependent Claim
118 words
AN ARRANGEMENT FOR AT LEAST PARTIALLY ELIMINATING UNDESIRED FLUCTUATIONS IN THE ANGULAR VELOCITY OF ROTATING APPARATUS, COMPRISING A SYNCHRONOUS ELECTRIC MOTOR DRIVABLY CONNECTED TO THE ROTATING APPARATUS, A SHAFT ROTATING WITH SAID APPARATUS, ELECTROMAGNETIC BRAKE MEANS ACTING ON SAID SHAFT AND ARRANGED TO APPLY A CONTINUOUS BRAKING TORQUE THERETO, A WINDING IN THE SAID MOTOR, AN ELECTRIC CIRCUIT INCLUDING SAID WINDING, SENSING MEANS IN THE SAID CIRCUIT TO DETECT FLUCTUATIONS IN THE CURRENT FLOWING IN SAID WINDING, AND CONTROL MEANS FOR PRODUCING AN OUTPUT SIGNAL DERIVED FROM THE AVERAGE OF THE FLUCTUATIONS SENSED BY THE SENSING MEANS AND FOR APPLYING THE SAID OUTPUT SIGNAL TO SAID BRAKING MEANS TO VARY THE BRAKING TORQUE APPLIED THEREBY TO SAID SHAFT.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |