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Factors of Carbon Brush Failure in Dongguan Generator Equipment

人气:: Article Source: Popularity :: Issuing time: 2018-12-25 17:12:25
The cause of the carbon brush failure of the Dongguan generator equipment: When the reactive power or the excitation current is adjusted, the spark of the carbon brush changes significantly. During the commutation of the exciter, the carbon brush and the commutator have poor contact and excessive contact resistance; the oxide film of the commutator or slip ring is uneven and causes the carbon brush current to be unbalanced; or the load changes suddenly and suddenly Short circuit caused abnormal voltage distribution between commutator segments; unit overload and imbalance; irrational selection of carbon brushes, unequal spacing of carbon brushes; quality problems of carbon brushes, etc.
Mechanical factors: the center of the commutator is not correct, the rotor is unbalanced; the vibration of the Dongguan generator set is large; the insulation between the commutator pieces or the commutator pieces are protruded; the contact surface of the carbon brush is not smooth or the surface of the commutator is rough. Poor contact; the surface of the commutator is not clean; the air gaps under the commutator poles are not equal; the spring pressure on the carbon brush is uneven or the size is not suitable; the carbon brush is too loose in the brush holder to jump, or the carbon brush is too tight Stuck in the brush grip and waited. Reduced unit operating speed or improved vibrations will reduce sparks.
Chemical factors: The unit is operating in corrosive gas, or the operating space of the Dongguan generator unit is short of oxygen, and a layer of naturally formed copper oxide film on the surface of the commutator in contact with the carbon brush is destroyed. The commutation of approximately linear resistance no longer exists, and the commutator spark intensified during the process of re-forming the oxide film on the contact surface. The commutator (or slip ring) is corroded by acid gas or grease. Carbon brushes and commutators are contaminated. http://kongtiaoweixiu0.cn/
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