US3391293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motors
Assignee: English Electric Co Ltd
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Filing: 1965-01-13
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Granted: 1968-07-02
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Expires: 1985-01-13
Abstract
No abstract record available.
Inventors
- 👤 Purcell Edward Samuel
- 👤 Pearson Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:41
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/30; H02K17/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
IN AN INTRODUCTION MOTOR COMPRISING A STATOR HAVING A STATOR MAGNETIC CORE AND ARRANGED TO ESTABLISH A GIVEN STATOR MAGNETIC CORE AND ARRANGED TO ESTABLISH A GIVEN NUMBER OF POLES, AN AUXILIARY WINDING FORMED IN THE STATOR MAGNETIC CORE AND ARRANGED TO ESTABLISH A SUBSTANTIALLY GREATER NUMBER OF POLES, MEANS FOR ENERGISING THE MAIN WINDING, MEANS FOR ENERGISING THE AUXILIARY WINDING, A ROTOR ROTATABLY MOUNTED WITHIN THE SAID STATOR AND HAVING A ROTOR MAGNETIC CORE, THE STATOR AND ROTOR MAGNETIC CORES IN COMBINATION PROVIDING A STATOR-ROTOR MAGNECTIC SYSTEM, AND A SQUIRREL CAGE WINDING COMPRISING AXIALLY EXTENDING CONDUCTORS DISPOSED IN THE ROTOR MAGNETIC CORE AROUND THE PERIPHERY THEREOF AND INTERCONNECTED AT THE ENDS OF THE ROTOR FOR ELECTROMAGNETICALLY DRIVING THE ROTOR FOR ROTATION AT RUNNING SPEED WHEN THE MAIN WINDING ALONE IS ENERGISED AND FOR ELECTROMAGNETICALLY PROVIDING A DYNAMIC BRAKING TORQUE FOR BRAKING THE MOTOR FROM ITS RUNNING SPEED WHEN THE AUXILIARY STATOR WINDING IS ENERGISED, A PLURALITY OF HIGH RELUCTANCE PORTIONS IN THE SAID STATOR-ROTOR MAGNETIC SYSTEM, THE SAID HIGH RELUCTANCE PORTIONS BEING SPACED AT EQUAL INTERVALS ANGULARLY OF THE ROTOR AND DIVIDING THE STATOR-ROTOR MAG-
Claim 2
Dependent Claim
186 words
IN AN INTRODUCTION MOTOR COMPRISING A STATOR HAVING A STATOR MAGNETIC CORE AND ARRANGED TO ESTABLISH A GIVEN STATOR MAGNETIC CORE AND ARRANGED TO ESTABLISH A GIVEN NUMBER OF POLES, AN AUXILIARY WINDING FORMED IN THE STATOR MAGNETIC CORE AND ARRANGED TO ESTABLISH A SUBSTANTIALLY GREATER NUMBER OF POLES, MEANS FOR ENERGISING THE MAIN WINDING, MEANS FOR ENERGISING THE AUXILIARY WINDING, A ROTOR ROTATABLY MOUNTED WITHIN THE SAID STATOR AND HAVING A ROTOR MAGNETIC CORE, THE STATOR AND ROTOR MAGNETIC CORES IN COMBINATION PROVIDING A STATOR-ROTOR MAGNECTIC SYSTEM, AND A SQUIRREL CAGE WINDING COMPRISING AXIALLY EXTENDING CONDUCTORS DISPOSED IN THE ROTOR MAGNETIC CORE AROUND THE PERIPHERY THEREOF AND INTERCONNECTED AT THE ENDS OF THE ROTOR FOR ELECTROMAGNETICALLY DRIVING THE ROTOR FOR ROTATION AT RUNNING SPEED WHEN THE MAIN WINDING ALONE IS ENERGISED AND FOR ELECTROMAGNETICALLY PROVIDING A DYNAMIC BRAKING TORQUE FOR BRAKING THE MOTOR FROM ITS RUNNING SPEED WHEN THE AUXILIARY STATOR WINDING IS ENERGISED, A PLURALITY OF HIGH RELUCTANCE PORTIONS IN THE SAID STATOR-ROTOR MAGNETIC SYSTEM, THE SAID HIGH RELUCTANCE PORTIONS BEING SPACED AT EQUAL INTERVALS ANGULARLY OF THE ROTOR AND DIVIDING THE STATOR-ROTOR MAG-
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) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |