US4851728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutator for an electric machine
Assignee: Baumer Huebner GmbH
•
Filing: 1988-08-12
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Granted: 1989-07-25
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Expires: 2008-08-12
Abstract
Abstract A commutator for an electric machine with reciprocally insulated metal segments is described. At least one groove is made in the segments in the circumferential direction of the commutator and receives an insert formed from a precious metal or electrographite part. The axial width of the inserts only takes up part of the commutator contact surface. Alternatively two inserts are juxtaposed in each segment.
Inventors
- 👤 Gunter Doege
- 👤 Peter Jakob
- 👤 Ing L. Wilhelmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:22
CPC Classifications
H; H02; H02K; H02K13/00; H02K13/10; H02K13/105; H01; H01R; H01R39/00; H01R39/02; H01R39/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
129 words
A commutator for an electric machine, comprising: a cylindrical support made from insulating plastic; a plurality of radially directed slots on the outer circumferential region of said cylindrical support; a plurality of metal segments held by said radially directed slots of the cylindrical support and electrically insulated from one another in the outer circumferential region of said cylindrical support; a circumferentially extending commutator contact surface having a predetermined width and including at least parts of the circumferential surface of the segments; each of the segments being provided with at least one circumferential recess within the commutator contact surface; a precious metal insert being fixed in each recess flush with the segment surface; and each of the inserts having a width considerably smaller than the width of the contact surface.
Claim 2
Dependent Claim
129 words
A commutator for an electric machine, comprising: a cylindrical support made from insulating plastic; a plurality of radially directed slots on the outer circumferential region of said cylindrical support; a plurality of metal segments held by said radially directed slots of the cylindrical support and electrically insulated from one another in the outer circumferential region of said cylindrical support; a circumferentially extending commutator contact surface having a predetermined width and including at least parts of the circumferential surface of the segments; each of the segments being provided with at least one circumferential recess within the commutator contact surface; a precious metal insert being fixed in each recess flush with the segment surface; and each of the inserts having a width considerably smaller than the width of the contact surface.
Claim 3
Dependent Claim
16 words
A commutator according to claim 1, wherein the insert has a height of approximately 0.5 mm.
Claim 4
Dependent Claim
15 words
A commutator according to claim 1, wherein there are circumferentially two parallel recesses with inserts.
Claim 5
Dependent Claim
17 words
A commutator according to claim 1, wherein the recess is constructed as a sloping or arrow-shaped groove.
Claim 6
Dependent Claim
17 words
A commutator according to claim 1, wherein the cross-section of the recess and the insert is rectangular.
Claim 7
Dependent Claim
20 words
A commutator according to claim 1, wherein the cross-section of the recess and the insert is square, triangular or trapezoidal.
Claim 8
Dependent Claim
17 words
A commutator according to claim 1, wherein the cross-section of the recess and the insert is dovetailed.
Claim 9
Dependent Claim
17 words
A commutator according to claim 1, wherein the recess and the insert have a circular segmental cross-section.
Claim 10
Dependent Claim
16 words
A commutator according to claim 1, wherein the recess is constructed as a radially directed opening.
Claim 11
Dependent Claim
17 words
A commutator according to claim 1, wherein the insert is fixed by means of a conductive adhesive.
Claim 12
Dependent Claim
16 words
A commutator according to claim 1, wherein the insert is secured by soldering, welding or beading.
Claim 13
Dependent Claim
14 words
A commutator according to claim 1, wherein the insert is produced by flame spraying.
Claim 14
Dependent Claim
33 words
A commutator according to claim 1, wherein for producing the insert, the precious metal is placed in one piece in the recesses of several commutator segments and is subsequently separated between the segments.
Claim 15
Dependent Claim
17 words
A commutator according to claim 1, wherein inserts prefabricated in accurate-to-fit manner are placed in the recesses.
Claim 16
Dependent Claim
13 words
A commutator according to claim 1, wherein the precious metal insert is silver.
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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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |