The overheating caused by mechanical friction causes the brush slip ring to become overheated. In most cases, it is the Slip Ring Connector mechanism and friction and other factors that cause the brush slip ring to overheat. The high temperature of the electric ring is caused by overheating due to mechanical and frictional reasons: a large part of the overheating defects of the collector ring and the brush slip ring is due to the overheating caused by mechanical and frictional reasons. If the excitation has not been applied when starting up, It has been found that the temperature of the collector ring and the brush slip ring is high, or the temperature is too high during operation. After pulling out a few brushes, the temperature drops instead, so it is basically sure that it is caused by mechanical and frictional reasons.
The heat generation caused by machinery and friction is very complicated, mainly in the following three aspects: (1) The contact surface between the brush slip ring and the collector ring is too small, and the contact area should generally not be less than 75% of the cross-section of a single brush. The brush contact surface of the Conductive Slip Ring is poorly ground or too many brushes are replaced at one time during operation. Replace the brushes during operation. At the same time, only 1-2 brushes are allowed to be replaced on each carbon brush holder. The replaced new brushes should be ground in advance on a model with the same diameter as the collector ring, and the old and new brushes must be of the same grade. If there are a lot of brushes to be replaced at one time during overhaul, sufficient time should be left for the formation of oxide film on the surface of the brushes before commissioning. The contact surface between the brush and the collector ring is too small, and the contact area should generally not be less than 75% of the cross-section of a single brush. (2) The brush is swinging in the brush box or the action is jammed. The brush should be able to move up and down freely in the brush holder, and the gap should meet the product regulations. If there is no regulation, the gap can be 0.10-0.20mm. The shape of the brush should be square, and the size error of the upper and lower ends should not exceed 0.05mm. (3) The gap between the brush holder and the surface of the collector ring is too large. Due to the brittle material of the carbon brush of the collector ring, when the gap between the brush holder and the surface of the collector ring is too large, the brush cannot contact the collector ring as a whole during operation, and contacts with the collector ring on an inclined plane, which may easily cause the brush to break. The gap between the brush holder and the carbon brush surface of the collector ring should meet the technical requirements of the product. When the product is not specified, the gap can be adjusted to 2-3mm. When adjusting the gap, a layer of 2-3mm thick rubber pad can be used to attach it to the collector. On the surface of the electric ring, press the brush holder against the rubber pad, then tighten the set screw and take out the rubber pad. We have slip ring on sale, if you are interested, please contact us.
