US3828426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating magnetomotive devices
Assignee: PHELON CO Inc
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Filing: 1972-12-26
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Granted: 1974-08-13
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Expires: 1992-12-26
Abstract
Abstract Method of fabricating magnetomotive devices by encapsulating a unitary pole-shoe magnet group into a casting of nonmagnetic material. The pole-shoe portion of the group is formed of a plurality of integral, stacked ferromagnetic laminations, each having between the shoe portions an interconnecting web disposed radially inward of the outer surface of the pole-shoes. The magnetomotive device is cast so that the outer surfaces of the pole-shoe laminations are generally flush with the outer diameter of the casting. The interconnecting web portions are then removed so that the pole-shoes are magnetically separated. Alternatively, the disclosure is concerned with a pole-shoe magnet group for a flywheel magneto which is composed of a plurality of stacked ferromagnetic laminations embracing a permanent magnet. Each of the laminations has at least two pole-shoe portions interconnected by a web disposed radially inward of the outer surface of the pole-shoes whereby the web may be removed by a single drilling operation.
Inventors
- 👤 R Phelon
- 👤 Amsterdam J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:02
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/2726; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49075; Y10T29/49078; Y10T29/49799
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
Method of fabricating magnetomotive devices comprising the steps of encapsulating in a nonmagnetic body having an axis of rotation, a pole-shoe magnet group including a magnet and a plurality of integral, stacked ferromagnetic laminations, each having pole-shoe portions, said portions having respective surfaces defining in part a cylindrical surface about a given radius of curvature from said axis of rotation and serving as surfaces of flux emanation, and a web interconnecting said poleshoe portions and being disposed within said nonmagnetic body so as not to extend radially outward of said cylindrical surface defined in part by said pole-shoe surfaces, forming said magnetomotive device such that said surfaces of flux emanation are generally flush with a final diameter of the nonmagnetic body and thereafter removing the webs of said stacked laminations such that said pole-shoes are magnetically separated whereby the magnetic lines of flux generated by said magnet extend from poleto-pole outwardly of said surfaces of flux emanation.
Claim 2
Dependent Claim
157 words
Method of fabricating magnetomotive devices comprising the steps of encapsulating in a nonmagnetic body having an axis of rotation, a pole-shoe magnet group including a magnet and a plurality of integral, stacked ferromagnetic laminations, each having pole-shoe portions, said portions having respective surfaces defining in part a cylindrical surface about a given radius of curvature from said axis of rotation and serving as surfaces of flux emanation, and a web interconnecting said poleshoe portions and being disposed within said nonmagnetic body so as not to extend radially outward of said cylindrical surface defined in part by said pole-shoe surfaces, forming said magnetomotive device such that said surfaces of flux emanation are generally flush with a final diameter of the nonmagnetic body and thereafter removing the webs of said stacked laminations such that said pole-shoes are magnetically separated whereby the magnetic lines of flux generated by said magnet extend from poleto-pole outwardly of said surfaces of flux emanation.
Claim 3
Dependent Claim
37 words
Method of fabricating magnetomotive devices as set forth in claim 1 in which said device is a flywheel magneto which is formed by die casting and the webs of said stacked laminations include generally cylindrical hub portions.
Claim 4
Dependent Claim
19 words
Method of fabricating magnetomotive devices as set forth in claim 1 in which said webs are removed by broaching.
Claim 5
Dependent Claim
39 words
Method of fabricating magnetomotive devices as set forth in claim 2 in which said hub portion of said stacked laminations includes a concentric bore therethrough and said hub is removed by drilling using said bore as a drill guide.
Claim 6
Dependent Claim
39 words
Method of fabricating magnetomotive devices as set forth in claim 4 in which the outer diameter of the hub is less than the diameter of said drill whereby the hub portion of the web is entirely removed by drilling.
Claim 7
Dependent Claim
37 words
Method of fabricating magnetomotive devices as set forth in claim 5 in which a projection is provided in the casting die to form a tapered pilot in the casting material communicating with the bore of said web.
Claim 8
Dependent Claim
49 words
Method of fabricating magnetomotive devices as set forth in claim 6 in which said casting material is aluminum and wherein after casting the flywheel, its pole-shoe radius of curvature is cleaned by a die-stamping operation to insure that said surfaces of flux emanation are flush with the aluminum casting.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |