(1) Brush wear depends upon current, brush pressure and characteristics of brushes in significant level, but commutator film and its temperature have only a little effect on brush wear.
(2) Commutator film could be estimated by fritting type, and fritting voltage which bears a close resemblance to Poisson distribution. Good film is A-type having a large mean value λ.
(3) Sparks cause film surface worse from type A to C, moreover, make increase the wear amount of brushes by dropping out of carbon particles.
(4) The amount of brush wear in rolling traction could be calculated by adding each wear rate in sparking, current and temperature.
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