Electricity: circuit makers and breakers – Periodic – Contact breaker detail
Patent
1991-04-11
1992-07-28
Scott, J. R.
Electricity: circuit makers and breakers
Periodic
Contact breaker detail
200 19R, H01H 1900, F02P 702
Patent
active
051342570
ABSTRACT:
A distributor rotor electrode comprising an electrode head having a pair of flat surfaces substantially parallel to a plane of rotation of the rotor electrode and a generally arcuated, convexed discharge surface perpendicular to the plane of rotation to define a discharge gap on it. The electrode head has an electrically high-resistance layer attached to at least the pair of substantially flat surfaces, and comprises a material including a ceramic effective to suppress noise electromagnetic wave radiation at the discharge surface. The high-resistance layer material may comprise 10% to 70% of SiC and a mixture of SiOx, Si and C and may be attached to the discharge surface as well as to the flat surfaces, or to the flat surfaces only to expose the arcuated discharge surface to the discharge gap. The arcuated discharge surface may have ridges and grooves extending generally perpendicularly to the plane of rotation, and may have a wave-shaped or comb-shaped contour. The high-resistance layer may have a first ceramic layer of a first ceramic material exhibiting a good noise suppressing characteristic at the discharge surface and a second ceramic layer of a second ceramic material exhibiting a good adhesive characteristic at where it is attached to electrode head. The first ceramic material may comprise nitride ceramic or carbide ceramic such as silicon carbide and the second ceramic material may comprise oxide ceramic such as aluminum oxide.
REFERENCES:
patent: 4007342 (1977-02-01), Makino et al.
patent: 4177366 (1979-12-01), Kozuka et al.
patent: 4217470 (1980-08-01), Kirner
patent: 4369343 (1983-01-01), Sone et al.
patent: 5006674 (1991-04-01), Ohashi
patent: 5045653 (1991-09-01), Ohashi
Hiramoto Seigo
Morita Takeshi
Ohhashi Yutaka
Oka Kazuhiro
Mitsubishi Denki & Kabushiki Kaisha
Scott J. R.
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