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Motor fault diagnosis
Fault diagnosis Probably cause
All copper sheets turn
black
Incorrect brush pressure
The reversing pads are
grouped in a certain order
and blackened
Short circuit between reversing plates
Armature coil short circuit
Poor welding or open circuit between the commutation
plate and the armature coil
The reversing pad turns
black, but there are no
certain rules
Displacement of commutator centerline
The surface of the commutator is uneven and not round
Brushes worn, discolored,
and cracked
Motor vibration
Excessive gap between brush and brush box
Excessive distance between brush box and commutator
working surface
Mica protrusion between the commutator plates
Poor brush material
The brush brand is incorrect
Spark large
Motor overload
The commutator is not clean
The commutator is not smooth or circular
Mica plate or part of the reversing plate protrudes
Poor grinding of the electric brush
Insufficient brush pressure
Wrong brush model
The brush is stuck in the brush box
Loose or vibrating brush holder
The polarity and arrangement of the magnetic poles are
incorrect
Heating of brushes and
brush braids
Brushes with high sparks
Poor contact between the brush and the flexible wire
The area of the soft conductor coil is too small
Brushes have noise The surface of the commutator is not smooth
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