DC position close-loop system of spectrometer by feed-forward correction

LIU Ze-kun; LIU Jie; WANG Zhi-hong

doi:10.3788/OPE.20162413.0665

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DC position close-loop system of spectrometer by feed-forward correction

更新时间：2020-08-13

- DC position close-loop system of spectrometer by feed-forward correction
- Optics and Precision Engineering Vol. 24, Issue 10s, Pages: 665-674(2016)
- 作者机构：
  
  吉林大学仪器科学与电气工程学院, 吉林长春 130000
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162413.0665
  CLC： TM331
- Received：20 May 2016，
  
  Revised：03 June 2016，
  
  Published：14 November 2016
- 稿件说明：
移动端阅览
刘泽昆, 刘杰, 王智宏. 采用前馈校正的光谱仪直流位置闭环系统[J]. 光学精密工程, 2016,24(10s): 665-674

LIU Ze-kun, LIU Jie, WANG Zhi-hong. DC position close-loop system of spectrometer by feed-forward correction[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 665-674
刘泽昆, 刘杰, 王智宏. 采用前馈校正的光谱仪直流位置闭环系统[J]. 光学精密工程, 2016,24(10s): 665-674 DOI： 10.3788/OPE.20162413.0665.

LIU Ze-kun, LIU Jie, WANG Zhi-hong. DC position close-loop system of spectrometer by feed-forward correction[J]. Editorial Office of Optics and Precision Engineering, 2016,24(10s): 665-674 DOI： 10.3788/OPE.20162413.0665.

摘要

以光谱仪机械系统中的驱动机构为研究对象，采用直流力矩电动机和AS5048A磁性旋转编码，设计了基于DSP F2812的位置闭环控制系统，替换原有的开环步进系统，实现步进系统功能。该电机转子每转动3.6，经分光系统分光后的光波长增加1 nm，角位移精度为0.15。首先，介绍了磁性旋转编码器的工作原理及使用安装，并设计了驱动电路以及限位功能电路。然后，依据系统设计指标，研究了直流电机各类控制算法，提出了适用于本系统的前馈校正PID控制策略。最后，通过实验检验了直流系统的可靠性。依据数据分析结果，采用一种分段控制的补偿算法，解决了由于电机轴线与丝杠轴线不同轴度引入周期性变化干扰的问题。实验结果表明，系统角位移精度可达0.15。该位置闭环系统运行可靠，精度高，抗干扰能力强，有效避免了开环系统下步进电机的丢步现象。

Abstract

In this paper

driving mechanism of spectrometer mechanical system was taken as research object

and DC torque motor and magnetic spin encoding were adopted. On the basis of above

DSP F2812 was used to designan position closed-loop control system to take the place of the original open-loop stepper motor system. It can realize the function of stepper system that the wavelength of light splitted by optical-splitting system increase 1 nm

while motor runs angle displacement 3.6. The accuracy of angle displacement is 0.15. First

operating principle and installation of magnetic spin encoder were presented

and driving circuit and limited position mechanism were also designed. Then according to system design index

all kinds of control algorithms for DC motor were investigated. Thus

the feed-forward correction PID control strategy suitable for the system was proposed. Finally

the reliability of DC system was confirmed via experiment. Taking the experiment results as reference

an compensation algorithm for piecewise control was used to solve the problem of period interference cused by the low coaxiality between motor axis and screw axis. Experimental results indicate that the accuracy of angle displacement can reach to 0.15. The position closed-loop system runs reliably

critically and has strong anti-interference ability so that losing step phenomenon of open-loop stepper motor system is avoided efficiently.

关键词

Keywords

references

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