US4603474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collector for an electric machine and method for its production
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1984-05-17
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Granted: 1986-08-05
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Expires: 2004-05-17
Abstract
Abstract A collector for electric machines, including a rotationally symmetrical sintered ceramic body and a plurality of radially disposed metallic segments which are separated from each other by one interspace each and which are bonded to the ceramic body via a eutectic intermediate layer. The segments are bonded to the ceramic body in accordance with the eutectic method by being surface-oxidized on their inside narrow side and radially pressed against the ceramic body with the totality being brought to the melting temperature corresponding to the metal/metal-oxide eutectic and subsequently being cooled down again. A preferred embodiment includes: copper segments on an Al 2 O 3 ceramic body.
Inventors
- 👤 Jens Gobrecht
- 👤 Claus Schuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:09
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10S29/00; Y10S29/048; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
A collector for an electric machine, comprising: a rotationally symmetrical central sintered ceramic body having a jacket surface; and radially positioned surface-oxidized metallic segments disposed on said jacket surface, said segments separated from each other by an interspace and bonded to said jacket surface by means of a eutectic intermediate layer.
Claim 2
Dependent Claim
51 words
A collector for an electric machine, comprising: a rotationally symmetrical central sintered ceramic body having a jacket surface; and radially positioned surface-oxidized metallic segments disposed on said jacket surface, said segments separated from each other by an interspace and bonded to said jacket surface by means of a eutectic intermediate layer.
Claim 3
Dependent Claim
59 words
A collector as claimed in claim 1, wherein said ceramic body comprises a material selected from the group consisting of densely sintered aluminum oxide, aluminum oxide doped with zirconium oxide, and zirconium oxide, the metallic segments comprise a material selected from the group consisting of copper and a copper alloy, and the intermediate layer consists of the copper/copper-oxide eutectic.
Claim 4
Dependent Claim
32 words
A collector as claimed in claim 1, wherein the ceramic body has a smooth cylindrical jacket surface and the segments have inside tangential planar boundary surfaces adjacent said smooth cylindrical jacket surface.
Claim 5
Dependent Claim
19 words
A collector as claimed in claim 1, wherein the ceramic body has outer boundary surface including slots and lands.
Claim 6
Dependent Claim
22 words
A collector as claimed in claim 1, wherein the metallic segments have faces defining a radial height which decreases towards an end.
Claim 7
Dependent Claim
16 words
A collector as claimed in claim 1, wherein the metallic segments have faces including stress-relieving notches.
Claim 8
Independent Claim
101 words
A method for producing a collector for an electric machine, comprising: initially sintering a rotationally symmetrical ceramic body having a jacket surface; surface-oxidizing a plurality of metallic segments; disposing the surface-oxidized segments around the jacket surface of the ceramic body; exerting a radially acting press-on pressure on the ceramic body and the segments; heating the ceramic body and the segments with pressure exerted thereon in a furnance to a temperature required for generating a metal/metal-oxide eutectic such that said ceramic body is eutectically bonded to said metal segments; and cooling down to room temperature the bonded ceramic body and metallic segments.
Claim 9
Independent Claim
101 words
A method for producing a collector for an electric machine, comprising: initially sintering a rotationally symmetrical ceramic body having a jacket surface; surface-oxidizing a plurality of metallic segments; disposing the surface-oxidized segments around the jacket surface of the ceramic body; exerting a radially acting press-on pressure on the ceramic body and the segments; heating the ceramic body and the segments with pressure exerted thereon in a furnance to a temperature required for generating a metal/metal-oxide eutectic such that said ceramic body is eutectically bonded to said metal segments; and cooling down to room temperature the bonded ceramic body and metallic segments.
Claim 10
Dependent Claim
60 words
A method as claimed in claim 7, wherein a ceramic body of aluminum oxide is densely sintered and bonded to segments of copper to produce a eutectic intermediate layer by bringing said ceramic body and said copper segments to a temperature of 1,072±7° C. and subsequently cooling said aluminum oxide ceramic body and said copper segments down to room temperature.
Claim 11
Dependent Claim
116 words
A method as claimed in claim 7, comprising: providing a copper plate having on one side thereof parallel rectangular longitudinal slots of a predetermined width corresponding to a tangential distance between the segments; bending said plate around the ceramic body such that the longitudinal slots lie on the inside and parallel to the longitudinal axis of the ceramic body, the outside forming a smooth cylindrical body; clamping said body with said plate in a device exerting radial compressive forces; heating said clamped body and plate to the eutectic temperature; cooling down said heated clamped body and plate again to room temperature; and desurfacing the outside cylindrical copper jacket down to where the longitudinal slots break through.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |