Faqs

Commutator or ring are dirty
– Wrong positioning of brush seat
– Too low brush pressure on the commutator or ring
Carbon brush clearance in the brush holder is too large
– Wrong distance between commutator or ring and brushes
Strong vibrations
– Commutator or slip ring is out of-round
– Commutator bars insulation is not correct
– Wrong brush proportion acting on commutator bars
– Wrong positioning of brush-holder bridge
– Neutral line misadjusted
– Poor connections between commutator bars and windings
– Uneven current distribution between brushes
– Machine is overloaded
– Wrong brush grade
– Bad commutation
– Vibrations
– Commutator or slip ring is out of-round
– Protruding mica
– Uneven or too low brush pressure
– Uneven current distribution between brushes
– Machine is overloaded
– Mixed brush grades are fitted in
– Patchy commutator or slip-ring
– Adverse influence of oil or dirt
– Humidity too low
– Dusty air
– Aggressive gases and vapours in the air
– Unsuitable brush grade
– excessive brush play in the brush-holder box
– Too much distance between commutator or ring and brushes
– Wrong radial positioning of brush-holders
– Brush-holder pressure finger bent
– Commutator or slip-ring surface too smooth
– Protruding mica
– Dust, having a polishing effect, in the atmosphere
– Low environmental humidity
– Unsuitable brush grade
– Vibrations or oscillations at the brush holder and brush
– Brush pressure too low
– Defective windings
– Commutators or slip-rings out of-round
– Protruding or loose commutator segments
– Protruding mica
– Hard and fine dust particles in the cooling air
– Low machine load leads to pin point sparking on the brush contact surface
– High environmental humidity
– Chemical polluted (aggressive gas) air

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