基于STM32的磁编码器的设计  

The design of magnetic encoder based on giant magneto-resistance

作　　者：陈文浩[1] 朱礼尧[1] 迟涵文[1] 刘雯[1] 赵志永[1] 邓仕杰[1] 黄彤津 

机构地区：[1]杭州电子科技大学电子信息学院,杭州310018

出　　处：《电子测量技术》2015年第6期22-26,30,共6页Electronic Measurement Technology

摘　　要：选用巨磁阻传感器作为敏感元件,设计一款基于STM32微控制器的磁编码器。由正交放置在圆柱状磁体下方的4个巨磁阻传感器输出两路正交电压信号,该电压信号经过调理电路滤波、放大,采用STM32微处理器对放大后的两路电压信号进行模数转换,然后对转换后的数字量进行校正、辩向和查表等来完成信号处理,输出准确的旋转角度值,并根据需要灵活选择合适的编码器输出方式。试验结果表明,磁编码器具有较高的检测精度以及实时性。A Giant Magneto‐Resistance（GMR） sensor was selected to design a magnetic encoder based on STM32 microcontroller .Dual orthogonal voltage‐signals were generated by four GMR sensors which were orthogonally placed in the bottom of a columned magnet .And the two voltage signals were filtered and amplified through conditioning circuit ,and converted into digital signals in STM 32 chip .Rotational angle value would be accurately displayed after determined the quadrant ,look‐up table and performed arithmetic operation .And the output of the magnetic encoder can be flexible to choose as needed .The results showed that the magnetic encoder had a high detection accuracy and realtime .

关 键 词：STM32微处理器 磁编码器 巨磁阻传感器 算法运算 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]