查表实现双通道测角系统的粗精耦合  

Look-up-table method for coarse-fine data coupling for a double-channel angle measurement system

作　　者：李海霞[1] 张嵘[1] 韩丰田[1] 吴秋平[1] 

机构地区：[1]清华大学精密仪器系,北京100084

出　　处：《清华大学学报（自然科学版）》2014年第11期1481-1485,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然青年科学基金项目(61203227)

摘　　要：某型多轴转台设备中双通道感应同步器测角系统粗通道的原始精度差,无法应用传统粗精耦合方法(要求综合精度优于0.4°)输出绝对角度。该文结合双通道测角系统的特点,提出一种查表实现粗精耦合的方法,阐述了建立粗精相关表及查表得到绝对角度的过程。建立了以精测结果及绝对角度为自变量的粗测输出表达式,分析了粗测综合相对误差的边界条件。分析及实验结果表明:与传统方法相比,应用查表法实现粗精耦合,取消了对粗通道固定误差的限制,仅要求以精测零点为基准的360°/y(y为精测极对数)范围内的粗测综合相对误差(主要为漂移误差)小于粗测区间长度的一半(即0.5°)。The precision of the coarse channel in a double-channel in- ductosyn-based angle measurement system of a multi-axis turntable was out-of-tolerance, so the traditional coarse-fine data coupling method （integrated precision must be better than 0.4°） was not suf- ficient for getting the absolute angle. This paper provided a look-up- table method for coarse-fine data coupling based on a characteristic a nalysis of a double-channel angle measurement system. This paper described how to create the coarse-fine data coupling table and how to use the table to get the absolute angle. The output of the coarse channel was related to the output of the fine channel to get the abso- lute angle. The effect of the relative error boundary of the coarse channel was also analyzed. The analysis and experimental results show that unlike the traditional method, the look-up-table method for coarse-fine data coupling has no special limitations on the fixed error of the coarse channel and only requires its integrated relative error （mostly the drift error） within 360°/y （originating from zero points of the fine channel, where y is the number of pole-pairs of thefine channel） being less than half of the corresponding coarse interval （equivalent to O. 5°）.

关 键 词：感应同步器 粗精耦合 双通道测角系统 轴角变换 

分 类 号：TP712[自动化与计算机技术—检测技术与自动化装置]