How to deal with sparking in generator carbon brushes
1. Check if the broom length is too short and reaches the lifeline, making the pressure too weak and the broom cannot contact the slip. ring;
4. Check the electrical resistance of the rotor to ensure that the resistance is normal and that there are no short circuits between turns
5. If the oil space in the bearing is too large, causing the brush on the slip ring to jump a lot when the rotor rotates, check whether the radial runout of the slip ring surface is too large. The brush bounces and sparks;
6. In addition, if the brush is consistent with the one used previously. The brush has requirements for conductive current and friction speed.
Methods to prevent sparking from generator carbon brushes: Check carbon brushes and co ringsreaders every day
1. The wear length of the carbon brushes should not exceed 2/3. When the wear length of the carbon brush exceeds 2/3 (that is, the top of the carbon brush and the top of the brush holder are on the same plane), it should be replaced.
2. There is no spark from the carbon brush. When the carbon brush just begins to spark, it is necessary to find the cause and eliminate it in time.
3. There is no deviation of the carbon brush from the outside of the slip ring, and there is no crack on the edge of the carbon brush.
4. The carbon brush braid is well connected to the brush holder and the carbon brush, and there is no heat or contact with the brush holder.
5. The carbon brush does not jump, shake or get stuck in the brush holder.
1. The influence of the pressure of the compression spring. If the ppressure of the compression spring is too great, the mechanical wear of the carbon brush will increase; at the same time, if the pressure of the compression spring is too low, although the friction between the carbon brush and the slip ring is small, poor contact will easily produce sparks, which is also undesirable.
2. Influence of current. Generally speaking, for graphite carbon brushes, the current flowing through the positive carbon brush is larger than the current flowing through the negative carbon brush, so the wear of the positive carbon brush is longer . It wears more than the negative carbon brush. And the positive slip ring wears more than the negative slip ring, so every time the unit is overhauled, the positive and negative polarity wire heads of the carbon brush need to be adjusted.
3. The smoothness of the slip ring surface. More surfingthat of the slip ring is smooth, the lower its coefficient of friction and the lower the wear rate of the carbon brush. In addition, there is an oxide film on the surface of the slip ring, which is also very beneficial in reducing the friction coefficient and reducing the wear of the carbon brush.
4. The influence of the carbon brush material. Carbon brushes of different manufacturers and models have different compositions and structures, and their wear rates are also different. Choosing the same type of carbon brush can reduce the uneven wear rate of the carbon brush itself.