US3590208A
Expired / Lapsed
US
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Method of aligning and welding laminated sheets for electrical machines
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1968-11-04
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Granted: 1971-06-29
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Expires: 1988-11-04
Abstract
Abstract A method for producing a stack of laminations for the rotor or stator of an electrical machine. The method involves stamping a number of laminations to form projections and recesses at points around a circle. Each projection is formed in mating configuration with one of the recesses but displaced in the circumferential direction around the circle with respect thereto. The individual laminations are then stacked so that the projections of one lamination engage a recess of an adjacent lamination. Each lamination will then be angularly displaced, about the common axis formed by all of the circles, with respect to its adjacent laminations. The laminations are then welded together, preferably by a projection welding process.
Inventors
- 👤 Paul Martini
- 👤 Gotz Mrowka
- 👤 Heinz-Hermann Hasche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:51
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K15/023; B; B21; B21D; B21D28/00; B21D28/02; B21D28/22; H02K1/00; H02K1/06; H02K1/22; H02K1/26; H02K2201/00; H02K2201/06; H02K2201/09; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
In a method for producing a stack of laminations for an electrical machine the improvement comprising the steps of: a. stamping a plurality of laminations at corresponding points around a circle to form at least one projection and recess in each lamination which are of mating configuration, extend in the direction of the axis of said circle, and have corresponding edges which are angularly displaced in the circumferential direction of said circle; b. stacking said plurality of laminations with the projections of one lamination engaging a recess of an adjacent lamination, so that the corresponding engaging edges of the projection and the recess of adjacent laminations causes each of said laminations to assume a position which is angularly displaced, about the common axis formed by all of said circles, with respect to each adjacent lamination; and c. welding said plurality of laminations together.
Claim 2
Dependent Claim
143 words
In a method for producing a stack of laminations for an electrical machine the improvement comprising the steps of: a. stamping a plurality of laminations at corresponding points around a circle to form at least one projection and recess in each lamination which are of mating configuration, extend in the direction of the axis of said circle, and have corresponding edges which are angularly displaced in the circumferential direction of said circle; b. stacking said plurality of laminations with the projections of one lamination engaging a recess of an adjacent lamination, so that the corresponding engaging edges of the projection and the recess of adjacent laminations causes each of said laminations to assume a position which is angularly displaced, about the common axis formed by all of said circles, with respect to each adjacent lamination; and c. welding said plurality of laminations together.
Claim 3
Dependent Claim
86 words
The improvement defined in claim 1, wherein said stamping step includes the steps of arranging each one of said laminations on bottom die means having a recess located at least one point around said circle and stamping said one lamination with stamping die means at at least one point around said circle, said at least one point of said recess of said bottom die means being angularly displaced about the axis of said circle with respect to said at least one point of said stamping means.
Claim 4
Dependent Claim
38 words
The improvement defined in claim 1, wherein each of said laminations has at least one opening, in consequence of which the stack of laminations has at least one slot which is inclined with respect to said common axis.
Claim 5
Dependent Claim
32 words
The improvement defined in claim 1, wherein each of said at least one projection and recess are semicircular in shape and bounded on one side by a hole extending through said laminations.
Claim 6
Dependent Claim
84 words
The improvement defIned in claim 1, wherein each of said at least one projection and recess together form an approximately parallel cross-sectional periphery in a section taken along said circle and form two approximately parallel edges which are approximately perpendicular to the plane of said laminations, said edges extending around a portion of said at least projection and recess; and wherein the corresponding edges of said recess and projection which are opposite said parallel edges form an angle with the plane of said lamination.
Claim 7
Dependent Claim
36 words
The improvement defined in claim 1, wherein said at least one projection and recess are shaped and arranged such that when said laminations are stacked they are centered and prevented from rotating about said common axis.
Claim 8
Dependent Claim
88 words
The improvement defined in claim 2, wherein said stamping die means includes at least one stamping die having a circular stamping surface, a section of said stamping surface being arranged parallel to the plane of one of said laminations and the remaining section of said stamping surface being beveled at a prescribed angle with respect to said plane when said die is stamped against said one lamination, in consequence of which said prescribed angle determines the angular degree of displacement of said laminations, when said laminations are stacked.
Claim 9
Dependent Claim
51 words
The improvement defined in claim 7, wherein said recess in said bottom die means is a circular hole passing through said bottom die means, said circular hole having a diameter which is approximately 15 percent larger than the diameter of said circular stamping surface of said at least one stamping die.
Claim 10
Dependent Claim
132 words
The improvement defined in claim 8, wherein said diameter of said circular stamping surface of said at least one stamping die is 2.6 mm.; wherein said diameter of said circular hole in said bottom die is 3.0 mm.; wherein the displacement in the angular direction between said at least one point of said recess of said bottom die means and said at least one point of said stamping means is 0.25 mm.; wherein said prescribed angle with which said remaining section of said circular surface is beveled is 28* and wherein each of said laminations is 0.5 mm. thick and has at least one opening, in consequence of which the stack of laminations has at least one slot which is inclined at an angle of 35* with respect to said common axis.
Claim 11
Dependent Claim
33 words
The improvement defined in claim 1, wherein said at least one projection and recess are formed at the same point, on each one of said plurality of laminations, around at least one circle.
Claim 12
Dependent Claim
62 words
The improvement defined in claim 1, wherein said at least one projection and recess of each lamination are formed such that only the corresponding edges of the projection and the recess of adjacent laminations are in engagement when said laminations are stacked, and wherein said step of welding said plurality of laminations together comprises discharging a capacitor through said stack of laminations.
Claim 13
Dependent Claim
39 words
The improvement defined in claim 1, wherein said plurality of laminations are rotor laminations and have an opening for a rotor shaft, said at least one projection and recess being stamped around said circle immediately adjacent to said opening.
Claim 14
Dependent Claim
35 words
The improvement defined in claim 1, wherein said plurality of laminations are stator laminations, said at least one projection and recess being stamped around said circle immediately adjacent to the outer circumference of said laminations.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |