Patent US4347449A successfully refreshed from Google Patents.
US4347449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a magnetic armature of divided structure and armature thus obtained
Assignee: Airbus Group SAS
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Filing: 1980-03-06
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Granted: 1982-08-31
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Expires: 2000-03-06
Abstract
Abstract The present invention relates to a process for making a magnetic armature of divided structure of annular shape and provided with a concentric annular groove, comprising the steps of winding a filamentary magnetic material on an annular mandrel, impregnating said winding with a hardening material, then cutting said winding along the equatorial plane of said mandrel, after said material has hardened. The invention is more particularly applicable to the production of divided magnetic armatures, especially for magnetic bearings.
Inventors
- 👤 Jean-Francois Beau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:16
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0459; F16C32/0461; F16C32/0468; F16C32/0474; F16C32/0476; H; H01; H01F; H01F3/00; H01F3/06; H01F41/00; H01F41/02; H01F41/0206; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/14; Y10S174/19; Y10S174/21; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
145 words
A process for forming a magnetic armature having an annular shape and a concentric annular groove defined in part by concentric inner and outer radial rings, said inner ring having a radial thickness greater than that of said outer ring, said process comprising the steps of: winding a filamentary magnetic material on an annular mandrel having a cross-section on one side of a plane at right angles to the axis of said mandrel, which cross-section corresponds in part to the cross-sectional contour of said groove, to produce a toroidal winding having an outer shape on said side of said plane which at least approximately corresponds to the desired outer shape of said armature; impregnating said winding with a hardenable material capable when hardened of joining together the turns of said winding; hardening said material; and cutting said winding along said plane to form said armature.
Claim 2
Dependent Claim
145 words
A process for forming a magnetic armature having an annular shape and a concentric annular groove defined in part by concentric inner and outer radial rings, said inner ring having a radial thickness greater than that of said outer ring, said process comprising the steps of: winding a filamentary magnetic material on an annular mandrel having a cross-section on one side of a plane at right angles to the axis of said mandrel, which cross-section corresponds in part to the cross-sectional contour of said groove, to produce a toroidal winding having an outer shape on said side of said plane which at least approximately corresponds to the desired outer shape of said armature; impregnating said winding with a hardenable material capable when hardened of joining together the turns of said winding; hardening said material; and cutting said winding along said plane to form said armature.
Claim 3
Dependent Claim
36 words
A process of claim 1 wherein said mandrel varies in thickness, measured in a direction parallel to its axis, being greater at its end adjacent said outer ring than at its edge adjacent said inner ring.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1, wherein the filamentary material comprises a magnetic or non-magnetic, insulating coating.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1, wherein the section of the filamentary material is square, rectangular or hexagonal.
Claim 6
Dependent Claim
30 words
A process as claimed in claim 1, wherein the mandrel is symmetrical with respect to its equatorial plane so that each winding gives two identical armatures after impregnation and cutting.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 1, wherein the impregnating material is magnetic or non-magnetic, insulating material.
Claim 8
Dependent Claim
13 words
The process of claim 5, wherein the impregnating material is a polymerisable resin.
Claim 9
Dependent Claim
19 words
A magnetic armature, obtained by carrying out the process as claimed in any one of claims 1, or 2-6.
Claim 10
Dependent Claim
18 words
An electromagnetic device and particularly a magnetic bearing, wherein it comprises an armature as claimed in claim 8.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |