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直线电机滑台摩擦特性和摩擦模型
陈浩,孟健,安琦
作者单位E-mail
陈浩 华东理工大学机械与动力工程学院, 上海 200237  
孟健 华东理工大学机械与动力工程学院, 上海 200237  
安琦 华东理工大学机械与动力工程学院, 上海 200237 anqi@ecust.edu.cn 
摘要:
为了提高直线电机在高速、高加速工况下的运动精度,需要对直线电机滑台的摩擦特性进行研究。本文通过直线电机实验台研究了加速度和速度对摩擦力的影响。实验结果表明:加速度越大,预滑动阶段结尾处的临界摩擦力也越大;加速度越大,混合润滑区摩擦滞后现象越显著,使得Stribeck曲线出现后移;在高速运动下,黏滞摩擦力并不随速度呈线性变化,黏滞摩擦因子会随着速度增加而逐渐减小。针对这些摩擦特性,提出了考虑加速度影响的Stribeck二元摩擦模型。结合实验数据辨识出了模型参数并通过对比其他工况下的实验数据和模型预测值,验证了Stribeck二元模型的有效性。
关键词:  直线电机滑台  摩擦特性  加速度  摩擦模型
DOI:10.14135/j.cnki.1006-3080.2017.04.018
分类号:TH117.1
基金项目:上海市设计学Ⅳ类高峰学科项目
Friction Characterization and Friction Model of A Linear-Motor Rolling-Guide Stage
CHEN Hao,MENG Jian,AN Qi
Abstract:
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.
Key words:  linear-motor rolling-guide stage  friction characteristics  acceleration  friction model

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