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Reasons for Volvo Generator Carbon Brushes Sparking

Oct. 29, 2021

Today we are going to discuss the cause and treatment of Volvo generator carbon brush sparking.


The first is his electromagnetic factor: when the reactive power or excitation current is adjusted, the spark of the carbon brush changes significantly. During the commutation of the exciter, the carbon brushes are in poor contact with the commutator segments, and the contact resistance is too large; the oxide film thickness of the commutator or slip ring is uneven, causing the current distribution of the carbon brushes to be unbalanced; or the load changes suddenly, or unexpectedly. Short circuit causes abnormal voltage distribution between the commutator segments; Volvo generator overload and imbalance; unreasonable carbon brush selection and unequal carbon brush spacing; carbon brush quality problems, etc.


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The second is his mechanical factors: the commutator center is not correct, the rotor is unbalanced; Volvo generators vibrate greatly; the insulation between the commutator segments or the commutator segments protrude; the carbon brush contact surface is not smooth, or the commutator surface Roughness causes poor contact; the surface of the commutator is not clean; the air gaps under each commutation pole are not equal; the spring pressure on the carbon brush is uneven or the size is inappropriate; the carbon brush is too loose in the brush holder and jumps, or is too tight The carbon brush is stuck in the brush holder. If the Volvo generator's running speed is reduced or the vibration is improved, sparks will be reduced.


Finally, there are his chemical factors: Volvo generators are running in corrosive gas, or the Volvo generator's operating space lacks oxygen, and the naturally formed copper oxide film on the surface of the commutator in contact with the carbon brush is destroyed. The already formed commutation similar to linear resistance no longer exists, and the commutator sparks intensify when the oxide film is re-formed on the contact surface. The commutator (or slip ring) is corroded by acid gas or grease. The carbon brushes and commutator are contaminated, etc.


Check whether the length of the brush is too short to reach the lifeline, causing the brush to fail to contact the slip ring when the pressure is too small;


Check whether the pressure of the spring pressure finger is appropriate, if it is too small, it will cause the skipping of the brush to discharge;


Check the surface finish of the slip ring. If it is too hairy, it will increase the contact resistance of the brush and cause large sparks;


Check the rotor electrical to ensure that the resistance is normal and there is no short circuit between the turns;


Check whether the oil gap of the bearing is too large, which results in a large amount of bounce of the brush on the slip ring when the rotor is rotating. Check whether the radial bounce amount of the slip ring surface is too large. The brush spring triggers sparks. In addition, whether the brush is the same as the previous one, the brush has requirements for conductive current and friction speed.


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