mathiarasan
mathiarasan
Branch Unspecified
09 Feb 2009

Why do we use carbon brush in dc generator instead of copper brush?

why we are using carbon brush in dc generator instead of copper brush?
10 years ago
[Thread moved to Electrical Engineering Section]
Ashraf HZ

Ashraf HZ

Communications
10 years ago
I believe nowadays the brushes is a mix of both carbon and a bit of copper. The issue is to seek balance between the abrasion of the commutator and the wearing of the brushes.

But, looking at the extreme end of things, a full copper brush will cause great abrasion of the commutator. Add carbon, you'll maintain the longer life of the commutator, but the brushes themselves would wear out over time.
Rifaa

Rifaa

Branch Unspecified
10 years ago
ash
I believe nowadays the brushes is a mix of both carbon and a bit of copper. The issue is to seek balance between the abrasion of the commutator and the wearing of the brushes.

But, looking at the extreme end of things, a full copper brush will cause great abrasion of the commutator. Add carbon, you'll maintain the longer life of the commutator, but the brushes themselves would wear out over time.
Could not have said any better.
Mainly because of carbon last longer when they grind with copper, and it's soft and has a lower resistance.
If u think of touching any thing harder than copper in the commutator, do you it will last even a minute. 😲 I think not.

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