HANGCHA CPD30J - Page 11

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1.1.2 Failure diagnosis
CPD10-30
Failure phenomenon
Possible cause
All of sheet copper nigrescence
Brush’s pressure is wrong
Parts of commutator according to
a certain order nigrescence
·parts is short circuit
·armature coil is short
·parts of commutator is not fasten to armature coils open circuit
Parts of commutator are
nigrescent, but without definite
rule
·commutator’s center line location change
·commutator’ s surface is rough, out of round
Brush wear and tear, change
colors and break
·motor vibration
·clearance between brush and box is bigger.
·working surface distance between the box and commutator is
bigger
·mice between parts of commutator extrude
·material of the brush is bad
·trademark of the brush is wrong
Sparkle strong
·motor overload
·commutator is unholy
·commutator is rough or out of round
·mica or parts of commutator extrude
·brush seat grinding is bad
·the pressure of brush is not enough big
·trademark of the brush is wrong
·the brush lock in the box
·the brush frame is loose or vibrational
·the polarity and tactic order of magnetic pole is wrong
The brush and wire heat
·the sparkle of brush is strong
·the brush is not contacted with the cable
·the cable is thinner
The brush have noise
·the surface of the commmutator is rough