The rolling current-carrying friction pair is composed of inner raceway,outer raceway and elastic ring.The current-carrying friction tests were carried out to study the tribological properties and material damage of the friction pair under different rotational speeds.It is found that as the rotation speed increased from 240 r/min to 600 r/min,the total friction force during the steady-state period increases and the contact resistance decreases.At the early rolling stage,the material damage style is mainly plastic deformation of the contact surface,then turns to be the material peeling at the stable rolling period.Under the same initial contact conditions,high rotation speed promotes surface fatigue and material wear.After the experiments,the width of the wear scar significantly widens and the wear amount increases,the ratio of O and Cu atoms decreases,indicating the deceasing of the oxidation degree of the wear surface.Under the condition of similar increase in wear scar width,the increase in friction force at the same speed is smaller than that under variable speed conditions.Based on the motion video of the elastic ring,it is shown that the sliding/rolling of the elastic ring at high rotational speed has an impact on the increase of friction.