Reducing Wear of Brushes in Special-Purpose Starter-Generator GS-12TOK

The article analyzes the reasons for the increased wear of the brushes of the starter-generator GS-12TOK, caused by the peculiarity of its mode of operation. The authors of the article have investigated how sparking has influenced transitional processes “throwing the load - dropping the load” on the resistance of the polished film. Sparking leads to its disturbance and an increase in the wear of brushes. The authors have proposed a method for accelerating the formation of the polished film in multi-brush systems due to the inclusion of brushes with a high rate of formation of the polished film in the current transmission system. Flight tests and equivalent cyclic resource bench tests have been conducted. The generator equipped with the EG-61A polish-forming brushes (impregnated) with normal pressure on all brushes provides an increase in the service life of the current-carrying brushes by more than two times without increasing the rate of formation of the polished film. The generator with EG-61A polish-forming brushes (not impregnated) with a pressure on all brushes of 500-550g provides an increase in the resource of brushes up to five times with an increase in the rate of formation of the polished film. It is recommended for mass production.