The effect of current on the friction of carbon brush materials

Influence of contact parameters on the tribological behaviour of various graphite/graphite sliding electrical contacts

“…4b). Such a positive influence was also found in many similar studies of electrical contacts [21,[24][25][26]. However, the effect of the electric current for all other parameters is less obvious and more contact-and material-dependent.…”

“…Different effects of the electric current on the coefficient of friction have also be detected in other studies. Although in most studies a markedly positive effect is indicated [13,14,25,[27][28][29], as the electric current accelerates gas absorption to the surfaces, thereby reducing adhesion in the contact [13], it is also reversed in some trends [20], or in the absence of oxygen in the contact, even significantly negative [13,30].…”

Experimental Analysis of the Vibroacoustic Response of an Electric Window-Lift Gear Motor Generated by the Contact Between Carbon Brushes and Commutator

“…This one . This result can be explained by the so-called "electro-lubrication" mechanism [22] which was first observed by Lancaster [23]. The friction force decrease with electrical current has been extensively observed [24][25][26][27] and explained by the modification of graphitic platelets orientation on brushes surfaces due to electrostatic stress [23].…”

“…This result can be explained by the so-called "electro-lubrication" mechanism [22] which was first observed by Lancaster [23]. The friction force decrease with electrical current has been extensively observed [24][25][26][27] and explained by the modification of graphitic platelets orientation on brushes surfaces due to electrostatic stress [23]. Zaidi et al [27] carried out experiments with very similar testing conditions than those encountered in this paper in These electrical discharges generate wear [28][29][30] which modifies the brushes and commutator surfaces topography and roughness and then induces an increase of friction forces [22,31,32].…”

A novel preparation of resin-based electrical contact material impregnated with sulfonated graphene

“…RECMs, as the core component, maintain normal running of the sliding and rotating electromechanical system and the friction system. [1][2][3] At present, there is a problem that RECMs are not homogeneous and their interfaces are difficult to be coordinated due to their multiphase, multi-component and porous structures during the service process. As a result, it is difficult to simultaneously acquire wear resistance, anti-arc erosion and high matching characteristics.…”