Friction Characterization and Friction Model of A Linear-Motor Rolling-Guide Stage

In order to improve the motion precision of linear motor under the condition of high speed and large acceleration,research on friction characterization of linear-motor rolling-guide stage is required.The influences of acceleration and velocity on the friction were studied using the linear motor table.The break-away force at the end of pre-sliding regime increases with the increasing acceleration; friction lag during mixed lubrication regime is more significant with increasing acceleration,which makes the Stribeck curve appear backwards; Under the high speed movement,the viscous friction does not change proportionally with speed and viscous friction coefficient gradually decreases with increasing speed.According to these friction characteristics,Stribeck friction model including two variables considering the effects of acceleration is put forward.The model parameters is identified by using experimental data and by comparing the model predictions with experimental data under other experimental conditions,the effectiveness of the Stribeck friction model including two variables is verified.