高精度数字测速及动态位置检测算法  

High resolution digital velocity detection and dynamic position detection methods

作　　者：石忠东[1] 陈培正[2] 陈定积[1] 王先逵[1] 刘成颖[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084 [2]北京理工大学自动控制系,北京100081

出　　处：《清华大学学报（自然科学版）》2004年第8期1021-1024,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"十五"科技攻关项目(2001BA203B04)

摘　　要：为提高伺服系统的反馈精度,讨论了针对增量式光栅编码器的常用数字测速方法的测量精度。提出了基于32位浮点运算和改进的M/T法的高精度数字测速及动态位置检测算法。并以高性能32位浮点型DSP和大容量FPGA实现了算法的软硬件结构和功能。结果表明:该算法可以充分发挥增量式光栅编码器的动态连续测量能力和高频时标信号的内插作用,在整个测速范围内获得很高的测速精度和精度一致性,提高位置反馈的动态测量分辨率。对提高速度和位置反馈精度,改善伺服控制系统性能具有实际意义。The feedback resolution of servo control systems using incremental encoders can be improved by digital velocity detection methods. A high resolution digital velocity detection and dynamic position detection method was developed based on the improved M/T method and 32 bit floating point arithmetic. Its software and hardware was implemented using a high performance 32 bit floating point DSP and a large capacity FPGA. The results show that the feedback resolution was improved over a wide range of velocities and dynamic position measurements by utilizing the successive dynamic measuring capability of an incremental encoder and the interpolative effect of a high frequency clock. The control system enhances the performance of servomotor control systems.

关 键 词：光栅编码器 数字测速 位置检测 分辨率 

分 类 号：TH741.6[机械工程—光学工程]