Brush, commutator, and commutator device
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United States of America Patent
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Sep 8, 2009
Grant Date -
Jun 22, 2006
app pub date -
Nov 30, 2005
filing date -
Nov 30, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a commutator of a rotary electric machine, each of commutator segments has a low-resistive layer made of a low-resistive material and a high-resistive layer made of a high-resistive material having a specific resistance higher than that of the low-resistive material. The low-resistive material contains a carbonic material and a binder. The high-resistive material contains a carbonic material, a binder and an inorganic substance such as boron nitride. A mixing ratio of the inorganic material to the high-resistive material is more than 20 wt %. Alternatively, a brush, which makes contact with the commutator segments, can have the high-resistive layer and the low-resistive layer.
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