US4061936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous motor
Assignee: France Scott Fetzer Co
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Filing: 1976-04-26
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Granted: 1977-12-06
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Expires: 1996-04-26
Abstract
Abstract A self-starting, high running torque, synchronous motor is disclosed. The motor has an annular stator and a cylindrical rotor mounted within and spaced from the inner cylindrical periphery of the stator. The rotor is provided with a plurality of evenly spaced rotor poles about its cylindrical periphery. Spaced, axially tapered poles are provided about the inner periphery of the stator. One stator pole is angularly and circumferentially offset to serve as a starting pole, while the remaining stator poles are evenly spaced about an arc which does not include the offset pole.
Inventors
- 👤 Lee A. Woolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:14
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/10; H02K7/118; H02K7/1185; G; G04; G04C; G04C3/00; G04C3/16; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A synchronous motor comprising an annular stator having a cylindrical inner periphery, a cylindrical rotor mounted within and spaced from an inner cylindrical periphery of the stator, said rotor having a plurality of rotor poles spaced about its cylindrical periphery, said stator having a plurality of stator poles spaced about its inner periphery, one of said pluralities having axially tapered poles with one of said tapered poles being angularly and circumferentially offset from the remaining poles of said one of said pluralities, said remaining poles being equally spaced from each other about an arc which does not include the offset pole.
Claim 2
Dependent Claim
101 words
A synchronous motor comprising an annular stator having a cylindrical inner periphery, a cylindrical rotor mounted within and spaced from an inner cylindrical periphery of the stator, said rotor having a plurality of rotor poles spaced about its cylindrical periphery, said stator having a plurality of stator poles spaced about its inner periphery, one of said pluralities having axially tapered poles with one of said tapered poles being angularly and circumferentially offset from the remaining poles of said one of said pluralities, said remaining poles being equally spaced from each other about an arc which does not include the offset pole.
Claim 3
Dependent Claim
19 words
A synchronous motor according to claim 1, wherein said one of said pluralities is the plurality of stator poles.
Claim 4
Dependent Claim
18 words
a synchronous motor according to claim 2, wherein there are provided nine stator poles and 10 rotor poles.
Claim 5
Dependent Claim
17 words
A synchronous motor according to claim 3, wherein the tapered poles have an included angle of 36°.
Claim 6
Dependent Claim
18 words
A synchronous motor according to claim 4, wherein the center-to-center spacing of each equally spaced pole is 36°.
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) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |