US3857053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous motor stator pole arrangement
Assignee: Eaton Corp
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Filing: 1973-04-09
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Granted: 1974-12-24
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Expires: 1993-04-09
Abstract
Abstract The gear case is formed with three stator poles circumferentially arranged about the motor axis and formed to lie on the same radius. These poles are equal in width and are equally spaced. The motor case is formed with three or six stator poles. With three motor case stator poles, each is about twice the width of and lies between the gear case poles so the working air gaps are unequal, thus developing an asymmetrical magnetic pattern assuring self starting. In the case of six motor case poles, they are the same width as and lie in pairs between the gear case poles so the working air gaps are unequal. In either case the working air gaps of equal width are spaced 120*. The motor coil is wound on a bobbin and mounted between the cases around the poles.
Inventors
- 👤 K Yatsushiro
- 👤 G Kuchuris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:20
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A synchronous motor comprising a first case part having a group of poles lanced therefrom and formed to lie concentric with an axis, a second case part having a group of poles lanced therefrom and formed to lIe concentric with said axis, said case parts being magnetically connected and defining with said poles an annular space, a coil in said space and arranged to induce magnetic fields of alternating polarity in each of said groups when energized with alternating current, the poles of one group being arranged relative to the poles of the other group so that alternate working air gaps are unequal and the air gaps of equal size are equally spaced, and a rotor mounted for rotation on said axis and having a multiplicity of poles of alternate polarity on its periphery, each stator pole embracing more than one rotor pole.
Claim 2
Dependent Claim
143 words
A synchronous motor comprising a first case part having a group of poles lanced therefrom and formed to lie concentric with an axis, a second case part having a group of poles lanced therefrom and formed to lIe concentric with said axis, said case parts being magnetically connected and defining with said poles an annular space, a coil in said space and arranged to induce magnetic fields of alternating polarity in each of said groups when energized with alternating current, the poles of one group being arranged relative to the poles of the other group so that alternate working air gaps are unequal and the air gaps of equal size are equally spaced, and a rotor mounted for rotation on said axis and having a multiplicity of poles of alternate polarity on its periphery, each stator pole embracing more than one rotor pole.
Claim 3
Dependent Claim
28 words
A synchronous motor according to claim 1 in which the poles of one group have about twice the total effective area as the poles of the other group.
Claim 4
Dependent Claim
19 words
A synchronous motor according to claim 2 in which the air gaps of equal size are spaced 120* apart.
Claim 5
Dependent Claim
42 words
A synchronous motor according to claim 3 in which each of the poles of one group circumscribes 3 1/2 rotor poles and the poles of the other group lying between the spaced groupings of said one group circumscribe 6 1/2 rotor poles.
Claim 6
Dependent Claim
16 words
A synchronous motor according to claim 4 in which there are three poles in each group.
Claim 7
Dependent Claim
23 words
a synchronous motor according to claim 4 in which there are three poles in one group and six poles in the other group.
Claim 8
Dependent Claim
123 words
A synchronous motor comprising a first cup-like case having a group of stator poles lanced therefrom and formed concentrically about an axis, a second cup-like case nested within the first and having a group of stator poles lanced therefrom and formed to be concentric with the first group, the poles of one group being arranged relative to the poles of the other group so that alternate working air gaps are unequal and the air gaps of equal size are equally spaced about said axis, a coil surrounding the stator poles between the case parts, a rotor mounted for rotation on said axis and having a multiplicity of poles of alternate polarity on its periphery, each stator pole embracing more than one rotor pole.
Claim 9
Dependent Claim
123 words
A synchronous motor comprising a first cup-like case having a group of stator poles lanced therefrom and formed concentrically about an axis, a second cup-like case nested within the first and having a group of stator poles lanced therefrom and formed to be concentric with the first group, the poles of one group being arranged relative to the poles of the other group so that alternate working air gaps are unequal and the air gaps of equal size are equally spaced about said axis, a coil surrounding the stator poles between the case parts, a rotor mounted for rotation on said axis and having a multiplicity of poles of alternate polarity on its periphery, each stator pole embracing more than one rotor pole.
Claim 10
Dependent Claim
27 words
A synchronous motor according to claim 7 in which the total effective area of the poles of one group is about twice that of the other group.
Claim 11
Dependent Claim
81 words
A synchronous motor according to claim 8 in which working air gaps of the same same size are 120* apart and each group of poles in one group circumscribes 3 1/2 rotor poles and each group of poles of the other group lying between the groups of poles of said one group circumscribes 6 1/2 rotor poles and each group of poles of the other group lying between the groups of poles of said one group circumscribes 6 1/2 rotor poles.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |