29
No.
Displayed trouble
Reason
1
All copper plate nigrescence
Brush pressure incorrect
2
Commutator plate nigrescence
orderly
Short, or not welding well, disconnect
3
Commutator plate nigrescence in-
orderly
Center line movement, surface not smooth
or round
4
Brush abrasion, change color,
breaks
Motor librations, big clearance, ill
material, ill type
5
Big spark
Motor overloading, commutator not clean,
not smooth and round, brush not grind well,
small pressure, ill type, locked, loose,
ill pole or arrangement
6 Brush and lead heat
Brush big spark, ill contact of brush and
soft lead, big sectional area of soft lead
7 Brush cacophony
Commutator surface not smooth
Motor trouble and reason
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