磁场补偿对LVDT静态特性影响的研究

林宪臣; 尹明富; 孙会来; 赵镇宏

doi:10.13433/j.cnki.1003-8728.20180234

磁场补偿对LVDT静态特性影响的研究

doi: 10.13433/j.cnki.1003-8728.20180234

天津工业大学机械工程学院, 天津 300387

基金项目:

天津市高等学校科技发展基金项目 20130402

天津市科委项目 14JCTPJC00536

详细信息

作者简介:
林宪臣(1989-), 硕士研究生, 研究方向为精密测试技术与仪器, 657795976@qq.com

通讯作者:
尹明富, 教授, 博士, mingfuedu@126.com

中图分类号: TP212.9
计量
- 文章访问数: 282
- HTML全文浏览量: 120
- PDF下载量: 26
- 被引次数: 0
出版历程
- 收稿日期: 2018-08-15
- 刊出日期: 2019-05-05

Study on Influence of Magnetic Field Compensation on Static Characteristics of LVDT

College of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China

摘要

摘要: 为改善因内部感应磁场分布不均导致差动变压器式位移传感器（Linear variable differential transformer，LVDT）线性度差、灵敏度低的问题，提出一种磁场补偿法。在LVDT次级线圈远端添加两个关于初级线圈对称的导磁环，同时将可动铁芯的末端设计成具有一定锥度的形式，导磁环和铁芯均为软磁材料。利用有限元方法在Maxwell中建立LVDT模型，模块化后导入Simplorer中，在Simplorer中连接外部激励电路进行瞬态磁场的计算机联合仿真。瞬态分析结果表明：经过磁场补偿，LVDT的线性度和灵敏度得到显著提高，线性度从1.79%提高到0.5%，灵敏度提高了17.9 mV/mm，通过搭建实验平台，验证了方案的可行性。
- 磁场补偿 /
- 线性度 /
- 灵敏度 /
- 导磁环 /
- 锥形末端 /
- /
Abstract: A magnetic field compensation method is proposed to improve the linearity difference and low sensitivity of the linear variable differential transformer sensor (LVDT) due to the uneven distribution of the internal induced magnetic field. Adding two magnetic flux rings about the primary coil symmetry at the distal end of the LVDT secondary coil, and designing the end of the movable iron core into a form with a certain taper, the magnetic flux ring and the iron core are soft magnetic materials. The model of improved LVDT is established in Maxwell using finite element method, modularized and imported into Simplorer. The external excitation circuit is connected in Simplorer for joint computer simulation of transient magnetic field. The transient analysis results show that the linearity and sensitivity of LVDT are significantly improved by magnetic field compensation, the linearity is improved from 1.79% to 0.5%, and the sensitivity is improved by 17.9 mV/mm. Finally, the experimental platform was built to verify the feasibility of the scheme.
- sensor /
- magnetic flux ring /
- designing /
- finite element method /
- computer simulation /
- transient analysis /
- LVDT

HTML全文

图 1 传统LVDT结构图

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图 2 LVDT等效电路图

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图 3 新型LVDT结构图

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图 4 磁感线分布图

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图 5 简化前后线圈轴向上磁感应强度分布

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图 6 LVDT轴向磁场分布图

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图 7 联合仿真原理图

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图 8 新型LVDT差动输出结果

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图 9 LVDT差动输出特性曲线

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图 10 灵敏度变化曲线

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图 11 LVDT模块

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表 1 传统LVDT各行程的线性度和灵敏度

行程/mm	6.5	5.85	5.2	4.55	3.9	3.25
线性度/%	1.79	1.14	0.74	0.47	028	0.22
灵敏度/(mV·mm^-1)	119.7	121.6	122.8	123.8	124.4	124.8

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表 2 新型LVDT各行程的线性度和灵敏度

行程/mm	6.5	5.85	5.2	4.55	3.9	3.25
线性度/%	0.5	0.12	0.04	0.003	0.007	7.5×10^-4
灵敏度/ (mV·mm^-1)	137.6	138.5	138.8	138.7	138.7	138.8

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表 3 仿真与实验数据对比

行程/mm		传统LVDT		新型LVDT
行程/mm		仿真	试验	仿真	试验
5.2	线性度/%	0.74	0.85	0.04	0.17
5.2	灵敏度/(mV·mm^-1)	122.8	127.6	138.8	143.3
6.5	线性度/%	1.79	1.91	0.5	0.61
6.5	灵敏度/(mV·mm^-1)	119.7	124.5	137.6	142.1

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参考文献(15)

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