摘要
研究了一种通过数字式锁相环路提高编码器精度的方法。首先将原始的正弦和余弦信号与反馈的余弦和正弦信号均输入到同一个鉴相器中进行乘法和减法运算,去除了其中的高频分量,提高锁相环路的动态范围。为了产生含有方向信息的余/正弦信号,提出"可逆计数器+数字化的正/余弦波表"的方法,实现对运动停止时的静态检测或运动方向发生改变时的暂态停止位置检测的需求。此方法使常规码盘、光栅尺等常规检测装置的位置检测精度提高了2个数量级以上。
The digital phase-locked loop is used to improve the accuracy of the encoder. First, the sine and cosine of the original signal and the feedback of the cosine and sine signals are input to the same phase detector for multiplication and subtraction to remove the high frequency components, thus a better dynamic range of the PLL. The ＂reversible counter ＋ digital sine/cosine wave table＂ approach is adopted to generate cosine/sine signals contai- ning direction information, which achieves the static or transient position detection. This method improves the detec- tion accuracy of conventional encoder, grating and other conventional detection device s by at least two orders of mag- nitude.
出处
《电子科技》
2013年第11期83-85,共3页
Electronic Science and Technology
关键词
数字式锁相环路
编码器
检测精度
digital phase-locked loop
encoder
detection accuracy
