US4665335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small-sized synchronous motor with specific stator coil length to stator coil radius ratios
Assignee: Seiko Time Creation Inc
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Filing: 1986-06-20
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Granted: 1987-05-12
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Expires: 2006-06-20
Abstract
Abstract A small synchronous motor is provided with a stator winding wound around a stator core. Conversion efficiency is improved by setting the ratio of the coil length (L) to the thickness between the center of the core and the outer most periphery of the coil (R) to be L/R to 40.
Inventors
- 👤 Shigeru Shimozono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:59
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/18; G; G04; G04C; G04C13/00; G04C13/08; G04C13/10; G04C13/11; H02K21/185; H02K37/00; H02K37/10; H02K37/12; H02K37/14; H02K37/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A small-sized synchronous motor including: a stator having spaced-apart magnetic poles and being magnetically connected to both sides of a core around which is wound a coil, and a rotor rotatably disposed between the magnetic poles of said stator, wherein the length L of said core around which said coil is wound and the thickness R between the center of said core and the outermost periphery of said coil satisfy the relation 10≦L/R≦40.
Claim 2
Dependent Claim
73 words
A small-sized synchronous motor including: a stator having spaced-apart magnetic poles and being magnetically connected to both sides of a core around which is wound a coil, and a rotor rotatably disposed between the magnetic poles of said stator, wherein the length L of said core around which said coil is wound and the thickness R between the center of said core and the outermost periphery of said coil satisfy the relation 10≦L/R≦40.
Claim 3
Dependent Claim
26 words
A small-sized synchronous motor according to claim 1, wherein the length L of said core around which said coil is wound is 30 mm or more.
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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |