What are the reasons for the wear of brushed DC motor carbon brushes？

As we all know, the carbon brushes of brushed motors are easy to wear and need to be replaced in time, so what are the reasons for the wear of carbon brushes? Let me introduce the Vshida micro-motor to you.

1. The smoothness of the slip ring surface. The higher the smoothness of the slip ring surface, the smaller its coefficient of friction and the lower the wear rate of the carbon brush. There is a layer of oxide film on the surface of the slip ring, which is also very beneficial to reduce the friction coefficient and reduce the wear of the carbon brush.

2. The influence of compression spring pressure. If the compression spring pressure is too high, the mechanical wear of the carbon brush will increase; at the same time, if the compression spring pressure is too small, although the friction between the carbon brush and the slip ring is small, sparks are likely to be generated due to poor contact, which is also not advisable.

3. The influence of current. 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 greater than that of the negative carbon brush. And the positive slip ring wears more than the negative slip ring, so every time the unit is overhauled, it is necessary to adjust the positive and negative polarity cable heads of the carbon brush. Carbon brush material influence.

Carbon brushes are relatively easy to wear, so the quality and performance of carbon brushes can be determined by looking at the wear rate of carbon brushes. The important basis for determining the service life of the carbon brush is also the wear rate of the carbon brush. The smaller the wear rate, the longer the service life of the carbon brush.

The above are the reasons for the wear of the carbon brushes of brushed motors that we have introduced to you. For more information, please contact us.