HARRINGTON DESIRABILITY FUNCTION APPLICATION TO THE SELECTION OF MATERIALS FOR SLIDING ELECTRICAL CONTACT

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Authors

V.V. IZMAILOV, Dr. Sc., A.F. GUSEV, Cand. Sc., M.V. NOVOSELOVA, Cand. Sc.

Abstract

The results of a study of the frictional and electrical characteristics of the brush-collector unit of electric motors at temperatures up to 200 C are presented. The possibility of using the generalized Harrington desirability function as an integral indicator of the quality of electrical brush composite materials is shown. The generalized desirability function for copper-based electrical brush materials is calculated, taking into account the main operational characteristics of the contact: the friction coefficient, the linear wear rate of the brush and collector paired with a brush made of a given material, and the transient voltage drop. The desirability function is a universal dimensionless criterion that does not depend on the dimensions of the quantities included in it. According to the highest value of the desirability function, a sample with an optimal set of operational properties was selected. The best combination of operational characteristics is possessed by a material with a composition of 40 % – copper; 20 % – graphite; 40 % – molybdenum disulfide.

Keywords

collector, friction, wear, electrical resistance, high temperatures, materials, desirability function.