US5266860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutator
Assignee: Koki Holdings Co Ltd
•
Filing: 1992-03-17
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Granted: 1993-11-30
•
Expires: 2012-03-17
Abstract
Abstract A commutator has a central support supporting a plurality of conductive segments separated by a plurality of insulative segments. In addition to providing an insulative function between the conductive segments, the dielectric constant, the area, and the thickness of the insulative segments are chosen so that they provide a capacitive effect, which capacitive effect suppresses current peaks during operation of the commutator. Preferably, the dielectric constant is greater than 10. The central support may include a metal shaft and an insulating ring, which insulating ring is preferably of material with a lower dielectric constant thereby to suppress-shorting between the shaft and the conductive segments. It is particularly advantageous if the conductive and insulative segments are of ceramics material since this provides good wear resistance. In further alternatives, capacitors are formed between the conductive segments by rings or other bodies of insulative materials of a suitably high dielectric constant.
Inventors
- 👤 Akio Chiba
- 👤 Masahisa Sobue
- 👤 Kazuo Tahara
- 👤 Nobuyuki Yamashita
- 👤 Shun Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:54
CPC Classifications
H; H02; H02K; H02K13/00; H02K13/10; H02K13/105; H01; H01R; H01R43/00; H01R43/06; H01R39/00; H01R39/02; H01R39/04; H01R39/46
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A commutator comprising: a central support; a plurality of conductive segments; and a plurality of insulative segments, said conductive segments and said insulative segments being arranged alternately around a circumference of said central support; wherein each of said plurality of insulative segments has a dielectric constant which is greater than 10 and has an area of a surface in a plane in a radial direction to said central support and a thickness in a circumferential direction of said central support such that the insulative segments suppress current peaks during an operation of said commutator.
Claim 2
Dependent Claim
94 words
A commutator comprising: a central support; a plurality of conductive segments; and a plurality of insulative segments, said conductive segments and said insulative segments being arranged alternately around a circumference of said central support; wherein each of said plurality of insulative segments has a dielectric constant which is greater than 10 and has an area of a surface in a plane in a radial direction to said central support and a thickness in a circumferential direction of said central support such that the insulative segments suppress current peaks during an operation of said commutator.
Claim 3
Dependent Claim
14 words
A commutator according to claim 1, wherein said dielectric constant is at least 20.
Claim 4
Dependent Claim
16 words
A commutator according to claim 1 wherein said conductive segments are of a first ceramic material.
Claim 5
Dependent Claim
16 words
A commutator according to claim 1 wherein said insulative segments are of a second ceramic material.
Claim 6
Dependent Claim
17 words
A commutator according to claim 1, wherein each of said insulative segments includes Ti O 2 .
Claim 7
Dependent Claim
19 words
A commutator according to claim 1, wherein each of said insulative segments includes Ba Ti x O y .
Claim 8
Dependent Claim
24 words
A commutator according to claim 1, wherein said central support is made of an insulating material different from the material of said insulative segments.
Claim 9
Dependent Claim
21 words
A commutator according to claim 1, wherein each of said insulative segments has a resistivity of at least 3×10 5 Ωm.
Claim 10
Dependent Claim
21 words
A commutator according to claim 1, wherein each of said conductive segments has a resistivity not greater than 3×10 -4 Ωm.
Claim 11
Dependent Claim
24 words
A commutator according to claim 1, wherein said central support is made of an insulating material different from the material of said insulative segments.
Claim 12
Dependent Claim
30 words
A commutator according to claim 10, wherein said insulating material of said central support has a dielectric constant less than a dielectric constant of the material of said insulative segments.
Claim 13
Dependent Claim
30 words
A commutator according to claim 10, wherein said insulating material of said central support has a dielectric constant greater than a dielectric constant of the material of said insulative segments.
Claim 14
Dependent Claim
28 words
A commutator according to claim 10, wherein said insulating material of said central support has a resistivity greater than a resistivity of the material of said insulative segments.
Claim 15
Dependent Claim
27 words
A commutator according to claim 10, wherein said central support is provided on a central shaft of a conductive material so as to surround said central shaft.
Claim 16
Dependent Claim
37 words
A commutator according to claim 1, wherein each of said insulating segments is made of a first insulative material and wherein at least one body made of a second insulating material interconnects said plurality of conductive segments.
Claim 17
Dependent Claim
32 words
A commutator according to claim 15, wherein said at least one body is at least one ring which extends around said central support so as to interconnect said plurality of conductive segments.
Claim 18
Dependent Claim
28 words
A commutator according to claim 16, wherein said at least one ring is radially outward of said plurality of conductive segments around the circumference of said central body.
Claim 19
Dependent Claim
28 words
A commutator according to claim 16, wherein said at least one ring is radially inward of said plurality of conductive segments around a circumference of a central shaft.
Claim 20
Dependent Claim
39 words
A commutator according to claim 15, wherein said conductive and insulative segments extend along said central support in an axial direction thereof and wherein said at least one body extends to axial ends of said plurality of conductive segments.
Claim 21
Dependent Claim
14 words
A commutator according to claim 19, wherein said dielectric constant is at least 20.
Claim 22
Dependent Claim
19 words
A commutator according to one of claims 15 to 19 or wherein the body is of a ceramic material.
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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) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |