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Posted by on April 29, 2008, 1:48 pm
>
>
> > On 4/27/2008 6:54 PM A. H. G. spake thus:
>
> >> Can you tell me is the brushing material copper?
>
> > Since you asked, no; brushes are made of carbon.
>
> But looking at the brushing material, it seems metallic and like copper. How
> is carbon material conductive?
Carbon brush are conductive but have some resistance. Carbon is soft
and wears instead of the copper commutator. They have a copper coating
to conduct better in their brass (usually) holders.
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