US3419740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-commutated direct current motor with permanent magnet rotor
Assignee: Duracell Inc USA
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Filing: 1966-06-06
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Granted: 1968-12-31
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Expires: 1986-06-06
Abstract
No abstract record available.
Inventors
- 👤 Gianni A Dotto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:28
CPC Classifications
H; H02; H02K; H02K25/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A MOTOR COMPRISING: A ROTOR HAVING A PLURALITY OF RADIALLY AND EVENLY SPACED PERMANENT MAGNET POLES, SAID ROTOR BEING FIXEDLY MOUNTED ON A SHAFT ROTATABLY SUPPORTED ON SAID MOTOR; A PLURALITY OF STATOR POLES RADIALLY AND EVENLY SPACED ABOUT SAID ROTOR SO AS TO PROVIDE A UNIFORM AIR GAP THEREBETWEEN; FIELD COIL MEANS FOR DETERMINING THE POLARITY OF SAID STATOR POLES, SAID FIELD COIL MEANS BEING DISPOSED ABOUT SAID STATOR POLES; COMMUTATOR MEANS FOR ALTERNATELY CHANGING THE DIRECTION OF CURRENT FLOW THROUGH SAID FIELD COIL MEANS TO THEREBY CHANGE THE POLARITY OF SAID STATOR POLES, SAID COMMUTATOR MEANS COMPRISING FIRST AND SECOND BRUSHES AND A ROTATING MEANS FOR ALTERNATELY CONTACTING SAID FIRST AND SECOND BRUSHES, TO A NEGATIVE SIDE OF A DIRECT CURRENT POWER SOURCE, SAID ROTATING MEANS BEING FIXEDLY MOUNTED ON SAID SHAFT; MEANS FOR CONNECTING SAID FIRST AND SECOND BRUSHES TO SAID FIELD COIL MEANS; AND MEANS FOR CONNECTING SAID FIELD COIL MEANS TO A POSITIVE SIDE OF SAID DIRECT CURRENT POWER SOURCE.
Claim 2
Dependent Claim
165 words
A MOTOR COMPRISING: A ROTOR HAVING A PLURALITY OF RADIALLY AND EVENLY SPACED PERMANENT MAGNET POLES, SAID ROTOR BEING FIXEDLY MOUNTED ON A SHAFT ROTATABLY SUPPORTED ON SAID MOTOR; A PLURALITY OF STATOR POLES RADIALLY AND EVENLY SPACED ABOUT SAID ROTOR SO AS TO PROVIDE A UNIFORM AIR GAP THEREBETWEEN; FIELD COIL MEANS FOR DETERMINING THE POLARITY OF SAID STATOR POLES, SAID FIELD COIL MEANS BEING DISPOSED ABOUT SAID STATOR POLES; COMMUTATOR MEANS FOR ALTERNATELY CHANGING THE DIRECTION OF CURRENT FLOW THROUGH SAID FIELD COIL MEANS TO THEREBY CHANGE THE POLARITY OF SAID STATOR POLES, SAID COMMUTATOR MEANS COMPRISING FIRST AND SECOND BRUSHES AND A ROTATING MEANS FOR ALTERNATELY CONTACTING SAID FIRST AND SECOND BRUSHES, TO A NEGATIVE SIDE OF A DIRECT CURRENT POWER SOURCE, SAID ROTATING MEANS BEING FIXEDLY MOUNTED ON SAID SHAFT; MEANS FOR CONNECTING SAID FIRST AND SECOND BRUSHES TO SAID FIELD COIL MEANS; AND MEANS FOR CONNECTING SAID FIELD COIL MEANS TO A POSITIVE SIDE OF SAID DIRECT CURRENT POWER SOURCE.
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) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |