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Commutator - Every 4th segment blackened

Commutator - Every 4th segment blackened

Commutator - Every 4th segment blackened

(OP)
What could be the causes of this problem of every 4th commutator segment getting blackened ? The motor is 1500 HP DC, 1000 RPM base speed with 63 slots and 189 segments.

* I would go green if only I were not yellow *

RE: Commutator - Every 4th segment blackened

http://www.plantengineering.com/article/CA144818.html
Take a look at this site.  It appears to me to be slot bar marking related to the number of coils per slot.  From the picture, it appears to be a darkening of every third bar which makes sense as you have three coils in each armature slot.

RE: Commutator - Every 4th segment blackened

(OP)
Thanks oftenlost. A great tip.

* I would go green if only I were not yellow *

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