US4296343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor housing, or the like, with integral pole and methods for making same
Assignee: ELECTRO SYSTEMS Inc MCCRARY ROAD A DE CORP
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Filing: 1979-10-05
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Granted: 1981-10-20
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Expires: 1999-10-05
Abstract
Abstract An electrical machine including an armature rotatable within a housing comprised of a section of tubular ferrous material and methods for producing the housing. At least two alternate magnetic field pole pieces are secured within the housing and at least two intermediate induced pole pieces are formed by deforming the housing to provide inwardly projecting pole pieces intermediate the magnetic field pole pieces, each of the pole pieces conforming to the shape of and closely embracing the armature.
Inventors
- 👤 Bobby E. McMillen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/03; H02K1/00; H02K1/06; H02K1/12; H02K1/17; H02K23/00; H02K23/02; H02K23/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
An electric machine including an armature supported on a shaft for rotation within a housing, the housing comprising: a section of tubular ferrous material; at least two magnetic field pole pieces secured within the tubular ferrous material to provide alternate poles having curved surface areas spaced from and conforming generally to the curvature of the armature, and; at least two intermediate induced field pole pieces provided by inwardly projecting sections of side walls of the tubular ferrous material and having arcuate face surfaces essentially equal in area to that of the magnetic pole pieces and spaced from the magnetic field pole pieces, said inwardly projecting pole pieces providing alternate intermediate poles for the machine by the induction effects generated from the magnetic field pole pieces in cooperation with the armature in the total magnetic flux path.
Claim 2
Dependent Claim
136 words
An electric machine including an armature supported on a shaft for rotation within a housing, the housing comprising: a section of tubular ferrous material; at least two magnetic field pole pieces secured within the tubular ferrous material to provide alternate poles having curved surface areas spaced from and conforming generally to the curvature of the armature, and; at least two intermediate induced field pole pieces provided by inwardly projecting sections of side walls of the tubular ferrous material and having arcuate face surfaces essentially equal in area to that of the magnetic pole pieces and spaced from the magnetic field pole pieces, said inwardly projecting pole pieces providing alternate intermediate poles for the machine by the induction effects generated from the magnetic field pole pieces in cooperation with the armature in the total magnetic flux path.
Claim 3
Dependent Claim
16 words
The machine as recited in claim 1 wherein the magnetic field pole pieces comprise permanent magnets.
Claim 4
Dependent Claim
48 words
The machine as recited in claim 2 wherein the permanent magnets are ceramic magnets having a first surface curved to conform to the curved interior of the tubular housing and a second surface opposite the first surface which is curved to conform to the shape of the armature.
Claim 5
Dependent Claim
23 words
The machine as recited in claim 3 wherein the ceramic magnets are secured within the tubular housing by means of an epoxy glue.
Claim 6
Dependent Claim
29 words
The machine as recited in claim 4 wherein there are two alternate magnetic field pole pieces and two intermediate field pole pieces in which the magnetic effects are induced.
Claim 7
Dependent Claim
40 words
The machine as recited in claim 1 wherein the section of the tubular ferrous material has flat surfaces parallel to one another and from which an extended portion of the said flat surface projects inwardly to provide the intermediate poles.
References Cited (Backward Citations)
US2456701A
Cited
US2683826A
Cited
US3083310A
Cited
US3510707A
Cited
US3445693A
Cited
US3988623A
Cited
US3889141A
Cited
US4151435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |