摘要
为提高某数控工作台的定位精度,以多数现代数控机床所采用的半闭环控制系统为研究对象,提出了一种基于西门子FM351定位模块的全闭环伺服定位控制系统。通过引入直接检测运动部件最终位移的数字测量环的方法,利用光电编码器检测旋转工作台的角位移,经反馈信号控制伺服驱动器,完成对交流伺服电机的转速控制,进而实现了对工作台的精确定位。并在低速大惯量转台上对本伺服定位系统进行了实验验证,实验结果表明该方法有效的消除了机械传动产生的误差对定位精度的影响,显示了全闭环伺服定位控制系统的优越性。
In order to improve the positioning accuracy of CNC table,a full closed loop servo positioning control system based on Siemens FM351 Positioning Module is proposed after studying the semi-closed loop control systems used in most CNC machine tools.Through introducing the digital measuring loop in directly detect the moving parts＇ final displacement and using photoelectric encoder detects the angular displacement of the rotary table,the output signals control the servo driver,then finished the speed control of the AC servo motor,so as to realize the precise positioning of the table.Experiments were carried out on a low speed and large inertia rotary table,the results show that the proposed technique can effectively reduce the errors produced by Mechanical transmission,the positioning accuracy is greatly improved,and reflect the superiority of the full closed loop positioning control system.
出处
《组合机床与自动化加工技术》
北大核心
2012年第3期85-88,共4页
Modular Machine Tool & Automatic Manufacturing Technique
关键词
交流伺服
定位精度
全闭环
传动误差
AC servo
positioning accuracy
full closed loop
transmission error
