Calculation of Temperature Transients in Carbon Brushes

Calculations of the temperatures that appear at the faces of sliding contacts and brushes require certain assumptions concerning the mechanism of conduction and the size, shape, and number of contact spots. Previous calculations have been made based on certain arbitrary numbers for these factors. In this paper, a wide range of values for these factors has been investigated using computer techniques, and a correlation between the shape, size, and number of these contact points can now be made based upon the physics of oxidation and film breakdown that take place during conduction and sliding.