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Fault diagnosis
Pressure of the brush is not right
Commutator segments blacken in
group according to certain sequence
·Short circuit of commutator segments
·Short circuit of armature coils
·The welding of commutator segments and armature
coils is not good or short circuit.
Commutator segments blacken, but
without sequence
·Center line shift of the commutator
·Rough, un-round of the commutator surface
Wear, color change and fracture of
brush
·Motor vibrate
·Gap between brush and brush box is too large
·The distance between brush box and commutator
working surface is too long
·The mica between commutator segments extrudes.
·Brush material is not good.
·Trade mark of brush is not right
·Overloaded of motor
·Commutator is not clear
·Commutator is not smooth or round
·Mica plate or part commutator segment extrude
·Brush does not grind well
·Brush pressure is not large enough
·Incorrect brush trade mark
·Brush locked in the brush box
·Brush carrier loosen or vibrate
·Incorrect pole polarity and sequence
Brush and brush wire overheat
·Large brush spark
·Electrical brush and flexible conductor have bad contact
·Small flexible conductor area
Uneven commutator surface
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