多读数头混合布局测角误差抑制方法

在不增大码盘尺寸的前提下,对测角传感器读数头的布局展开研究,以研制小型化高精度的测角传感器。本文基于测角误差的谐波分析结果,详细推导和分析了多读数头布局对角度测量误差的抑制原理。通过对几种典型多读数头布局方式进行深入研究,提出一种采用奇数头和偶数头相结合的读数头混合布局方式,以消除更多更高阶次误差,提高测角传感器的精度。实验结果表明,当采用三个、四个和六个读数头均匀布局形式时,测角传感器的测角精度分别为15.44″、9.72″和8.96″;当采用六个读数头优化布局的方式时,测角精度可达到7.7″。上述结果说明多读数头优化布局可有效抑制测角误差,提高测量精度。

Suppression method for angle measurement error of mixing-layout multiple reading head

Under the premise of not increasing size of code , layout form for reading head of angle measurement sensor was researched to develop high-precision angle measurement sensor with miniaturization . Through harmonic analysis for angle measurement error ,the suppression principle of layout for multiple reading head to angle measurement error was deducted and analyzed in detail .On the basis of intensive study on various typical layout modes for multiple reading head ,a mixed layout method for reading head combined with odd-number head and even-number head was proposed to eliminate more and higher order errors and improve accuracy of angle measurement sensor .The experiment result show s that at the time of adopting layout form for uniform distribution of three ,four and six reading heads , angle measurement accuracies of angle measurement sensor are respectively 15 .44″,9 .72″and 8 .96″;when adopting optimized layout form of six reading heads ,angle measurement accuracy can reach 7 .7″.Thus it can be concluded that optimized layout for multiple reading head can effectively restrain angle measurement error and improve measurement accuracy .