US3694907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making low inertia rotor for dynamo electric machines
Assignee: E RAGONOT ETS
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Filing: 1970-07-06
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Granted: 1972-10-03
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Expires: 1990-07-06
Abstract
Abstract The complete winding outline of a rotor, including the forward as well as the return conductor of the winding loops are applied, in flat form, to a flexible sheet, as a printed or laminated conductor. The flexible sheet has a fold line, across which the conductor portions forming the coil ends extend. The sheet is then folded along the fold line upon itself and rolled into a hollow cylinder, to form a self-supporting rotor. If desired, an internal support of a plastic, metal tube, or the like can be applied Multiple-layer windings can be formed by first applying the winding outline to the sheet, and then folding the sheet-zigzag upon itself with additional insulating layers where conductors would contact each other, and then rolling the folded sheet with the conductors thereon into a cylinder.
Inventors
- 👤 Pierre Margrain
- 👤 Gerard Lacroux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:28
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
254 words
Method of manufacturing low inertia rotors for dynamo electric machines comprising providing an array of unitary, integral conductor lines in plan outline and having a central fold line (X-X), said conductor lines being arranged in plan outline of complete winding loops and having a first slating portion to form the end of the winding, a straight portion essentially transversed to said fold line to form a first active portion of the winding loop; second and third slanting portions, extending up to, through, and beyond said fold line respectively; a second straight portion essentially transverse to said fold line to form a return active portion of the winding loops; and a fourth slanting portion forming the other end of the winding; applying at least said first and second slanting portions and said first straight portion to a sheet of insulating material; folding said conductor lines about said fold lines so that said conductor portions will lie opposite each other separated by said sheet of insulating material; rolling said folded conductor lines with said insulating sheet into cylindrical form; securing terminal ends of said sheet with said conductor lines thereon together to retain cylindrical form; electrodepositing a layer of metal (19) on a cylindrical support (18, 27) to form a cylindrical metal layer; placing said folded cylindrically-formed sheet with said conductor lines thereon on said electrodeposited cylindrical metal layer; and removing at least a major portion of said cylindrical support while leaving said cylindrical metal layer to form a hollow, low inertia, composite cylindrical rotor structure.
Claim 2
Dependent Claim
254 words
Method of manufacturing low inertia rotors for dynamo electric machines comprising providing an array of unitary, integral conductor lines in plan outline and having a central fold line (X-X), said conductor lines being arranged in plan outline of complete winding loops and having a first slating portion to form the end of the winding, a straight portion essentially transversed to said fold line to form a first active portion of the winding loop; second and third slanting portions, extending up to, through, and beyond said fold line respectively; a second straight portion essentially transverse to said fold line to form a return active portion of the winding loops; and a fourth slanting portion forming the other end of the winding; applying at least said first and second slanting portions and said first straight portion to a sheet of insulating material; folding said conductor lines about said fold lines so that said conductor portions will lie opposite each other separated by said sheet of insulating material; rolling said folded conductor lines with said insulating sheet into cylindrical form; securing terminal ends of said sheet with said conductor lines thereon together to retain cylindrical form; electrodepositing a layer of metal (19) on a cylindrical support (18, 27) to form a cylindrical metal layer; placing said folded cylindrically-formed sheet with said conductor lines thereon on said electrodeposited cylindrical metal layer; and removing at least a major portion of said cylindrical support while leaving said cylindrical metal layer to form a hollow, low inertia, composite cylindrical rotor structure.
Claim 3
Dependent Claim
15 words
Method according to claim 1, wherein said support comprises a tough metal including soft iron.
Claim 4
Dependent Claim
30 words
Method according to claim 1, wherein said support comprises a composite of a central cylindrical body of tough metal and a cylindrical covering of a metal of low melting point.
Claim 5
Dependent Claim
31 words
Method according to claim 3 comprising the further step of first depositing a cover layer on the cylindrical body of low melting point metal before electrodepositing said layer of metal (19).
Claim 6
Dependent Claim
41 words
Method according to claim 1 including the step of applying an insulating layer (31) to the exposed surface of said conducting line at the outside of said cylindrically formed sheet; and banding (FIG. 10-32) the outside of said cylindrically formed sheet.
Claim 7
Dependent Claim
31 words
Method according to claim 5, wherein the step of banding comprises the step of electro-depositing a metallic layer on the outside of said insulating layer (31) covering the exposed conductive lines.
Claim 8
Dependent Claim
254 words
Method of manufacturing low inertia rotors for dynamo electric machines comprising providing an array of unitary, integral conductor lines in plan outline and having a central fold line (X-X), said conductor lines being arranged in plan outline of complete winding loops and having a first slanting portion to form the end of the winding, a straight portion essentially transversed to said fold line to form a first active portion of the winding loop; second and third slanting portions, extending up to, through, and beyond said fold line respectively; a second straight portion essentially transverse to said fold line to form a return active portion of the winding loops; and a fourth slanting portion forming the other end of the winding; applying at least said first and second slanting portions and said first straight portion to a sheet of insulating material; folding said conductor lines about said fold lines so that said conductor portions will lie opposite each other separated by said sheet of insulating material; rolling said folded conductor lines with said insulating sheet into cylindrical form; securing terminal ends of said sheet with said conductor lines thereon together to retain cylindrical form by inserting said rolled, cylindrical sheet about a mandrel (19, 18, 27); inserting said mandrel with said rolled sheet and conductive lines thereon into a pressure chamber having a resilient ring-shaped pressure bladder (23) of flexible material; and applying a pressure fluid inside said bladder to apply uniform pressure to the outside of said cylindrically rolled sheet and against said mandrel.
Claim 9
Dependent Claim
254 words
Method of manufacturing low inertia rotors for dynamo electric machines comprising providing an array of unitary, integral conductor lines in plan outline and having a central fold line (X-X), said conductor lines being arranged in plan outline of complete winding loops and having a first slanting portion to form the end of the winding, a straight portion essentially transversed to said fold line to form a first active portion of the winding loop; second and third slanting portions, extending up to, through, and beyond said fold line respectively; a second straight portion essentially transverse to said fold line to form a return active portion of the winding loops; and a fourth slanting portion forming the other end of the winding; applying at least said first and second slanting portions and said first straight portion to a sheet of insulating material; folding said conductor lines about said fold lines so that said conductor portions will lie opposite each other separated by said sheet of insulating material; rolling said folded conductor lines with said insulating sheet into cylindrical form; securing terminal ends of said sheet with said conductor lines thereon together to retain cylindrical form by inserting said rolled, cylindrical sheet about a mandrel (19, 18, 27); inserting said mandrel with said rolled sheet and conductive lines thereon into a pressure chamber having a resilient ring-shaped pressure bladder (23) of flexible material; and applying a pressure fluid inside said bladder to apply uniform pressure to the outside of said cylindrically rolled sheet and against said mandrel.
Claim 10
Dependent Claim
41 words
Method according to claim 7, including the step of applying an insulating layer (31) to the exposed surface of said conducting line at the outside of said cylindrically formed sheet; and banding (FIG. 10-32) the outside of said cylindrically formed sheet.
Claim 11
Dependent Claim
31 words
Method according to claim 8, wherein the step of banding comprises the step of electro-depositing a metallic layer on the outside of said insulating layer (31) covering the exposed conductive lines.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |