What are the reasons for sparks in the carbon brushes of mining electric locomotives?
During the use of mining electric locomotives, sparks are sometimes found in the motor carbon brushes. What is the reason for this phenomenon? What is the solution?
Sparking from the carbon brush of the motor is a common failure of the carbon brush of the motor. Generally, the cause of this phenomenon can be summarized as poor contact. There are many reasons for poor contact, the most common are the following:
1. The carbon brush of the motor does not match the commutator, resulting in excessive wear and other problems. If the difference in hardness is too large, the carbon brush of the motor and the commutator will be severely worn, and the surface will be uneven, making the contact between the two poor. The solution is to change the model to match the motor carbon brush.
2. Insufficient grinding of the carbon brush of the motor results in insufficient matching between the surface curvature of the motor carbon brush and the surface curvature of the commutator, resulting in poor contact between the two. The solution is to wrap fine sandpaper around the commutator and re-grind the carbon brushes of the motor.
3. The spring is wrong to the carbon brush (pressure) of the motor. If it is too large, it will cause the problem of 1, and if it is too small, the carbon brush of the motor cannot be kept in contact with the commutator. The solution is to adjust and replace the spring.
4. There is oil on the commutator or collector ring. The solution is to use clean cotton yarn dipped in gasoline to scrub the commutator and slip ring.
