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DC Motor fault diagnosis
Fault Probable cause
All copper sheet blacken 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 of the commutator shift
Rough and 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.
Brush mark is wrong
Sparkle strong
Motor overload
Commutator is rough or not round
Mica or parts of commutator extrude
Brush seat grinding is bad
The pressure of brush is not enough bi
Trade mark of the brush is wrong
The rush lock in the box
The brush frame loosens or vibrates
The polarity and tactic order of magnetic pole is wrong
The brush and wire heat
The sparkle of brush is strong
Bad contact between brush and cable.
The cable is too thin
The brush has noise The surface of the commmutator is rough
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