US3321653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current electric motor rotor
Assignee: Hitachi Ltd
•
Filing: 1964-03-03
•
Granted: 1967-05-23
•
Expires: 1984-03-03
Abstract
No abstract record available.
Inventors
- 👤 Sonoyama Yutaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:38
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A STATOR FOR AN A.C. MOTOR COMPRISING A STATOR CORE HAVING A PLURALITY OF SLOTS AND FIRST AND SECOND TYPE COILS CORRESPONDING IN NUMBER TO A PREDETERMINED NUMBER OF POLES AND CIRCULARLY DISPOSED ONE AFTER ANOTHER IN ALTERNATE ARRANGEMENT WITH THE SAME DISTANCE BETWEEN THE ELECTRICAL CENTERS OF SAID FIRST AND SECOND TYPE COILS IN THE CIRCUMFERENTIAL DIRECTION OF SAID STATOR BODY, SAID FIRST AND SECOND TYPE COILS MUTUALLY ADJACENT TO EACH OTHER BEING PROVIDED TO BE 180 ELECTRICAL DEGREES OFFSET THEREBETWEEN TO PRODUCE OPPOSITE POLARITIES FROM EACH OTHER, SAID FIRST TYPE COIL BEING WOUND IN SAID SLOTS WITH A CERTAIN SLOT PITCH WHICH IS SHORTER THAN THAT OF SAID SECOND TYPE COIL, AND SAID FIRST COIL PRODUCING AN EFFECTIVE MAGNETO-MOTIVE FORCE SMALLER THAN THAT OF SAID SECOND TYPE COIL.
Claim 2
Dependent Claim
130 words
A STATOR FOR AN A.C. MOTOR COMPRISING A STATOR CORE HAVING A PLURALITY OF SLOTS AND FIRST AND SECOND TYPE COILS CORRESPONDING IN NUMBER TO A PREDETERMINED NUMBER OF POLES AND CIRCULARLY DISPOSED ONE AFTER ANOTHER IN ALTERNATE ARRANGEMENT WITH THE SAME DISTANCE BETWEEN THE ELECTRICAL CENTERS OF SAID FIRST AND SECOND TYPE COILS IN THE CIRCUMFERENTIAL DIRECTION OF SAID STATOR BODY, SAID FIRST AND SECOND TYPE COILS MUTUALLY ADJACENT TO EACH OTHER BEING PROVIDED TO BE 180 ELECTRICAL DEGREES OFFSET THEREBETWEEN TO PRODUCE OPPOSITE POLARITIES FROM EACH OTHER, SAID FIRST TYPE COIL BEING WOUND IN SAID SLOTS WITH A CERTAIN SLOT PITCH WHICH IS SHORTER THAN THAT OF SAID SECOND TYPE COIL, AND SAID FIRST COIL PRODUCING AN EFFECTIVE MAGNETO-MOTIVE FORCE SMALLER THAN THAT OF SAID SECOND TYPE COIL.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |