Analysis of a homopolar disk generator via equivalent network

Abstract

This paper deals with a numerical modeling of the phenomena involved in sliding contacts in homopolar disk generators. Because of the velocity skin effect, the current distribution in sliding contacts is uneven and mainly concentrated in the rear part of the brushes. This can cause melting of the portion of the brush in the devices characterized by high currents. The knowledge of the distribution of the currents is important in order to avoid melting. An integral equivalent network formulation previously developed for the analysis of moving conductors has been modified to take into account the presence of sliding contacts. The numerical model presented is used to analyze the current distribution in a homopolar disk generator.