Patent US4095130A successfully refreshed from Google Patents.
US4095130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous motor
Assignee: Seikosha KK
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Filing: 1976-09-16
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Granted: 1978-06-13
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Expires: 1996-09-16
Abstract
Abstract A stator has a pair of magnetic pole portions, and a rotor having N- and S-poles is disposed between the two magnetic portions. Each magnetic pole portion of the stator has two static magnetic poles and a cut-away portion or indent formed therebetween. The stator is quadripolar statically, and bipolar dynamically.
Inventors
- 👤 Kenji Oshima
- 👤 Tomohisa Matsumoto
- 👤 Hiroshi Yamazaki
- 👤 Tamotsu Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:22
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/141; H02K1/143; G; G04; G04C; G04C3/00; G04C3/16; H02K21/00; H02K21/12; H02K21/14; H02K21/18; H02K21/185
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A synchronous electric motor comprising a stator having two spaced stator arms with like magnetic pole portions formed at fore ends thereof and opposing each other, an energizing coil on said stator, and a rotor rotatably disposed between said magnetic pole portions and having a pair of N- and S-poles, each of said magnetic pole portions having two static magnetic poles at equal distance from said rotor and an indent between said poles spaced at a greater distance than said poles from said rotor, whereby said stator is quadripolar statically and bipolar dynamically.
Claim 2
Dependent Claim
93 words
A synchronous electric motor comprising a stator having two spaced stator arms with like magnetic pole portions formed at fore ends thereof and opposing each other, an energizing coil on said stator, and a rotor rotatably disposed between said magnetic pole portions and having a pair of N- and S-poles, each of said magnetic pole portions having two static magnetic poles at equal distance from said rotor and an indent between said poles spaced at a greater distance than said poles from said rotor, whereby said stator is quadripolar statically and bipolar dynamically.
Claim 3
Dependent Claim
25 words
A synchronous electric motor according to claim 1, in which said four static magnetic poles of said stator are uniformly angularly disposed around said rotor.
Claim 4
Dependent Claim
33 words
A synchronous electric motor according to claim 1, in which said indents are symmetrical with respect to a line bisecting the angle between said static magnetic poles of each of said pole portions.
Claim 5
Dependent Claim
33 words
A synchronous electric motor according to claim 1, in which said indents are asymmetrical with respect to a line bisecting the angle between said static magnetic poles of each of said pole portions.
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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |