磁场补偿对LVDT静态特性影响的研究
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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。
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.
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.
引文
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[14] 赵博,张洪亮.Ansoft 12在工程电磁场中的应用[M].北京:中国水利水电出版社,2010Zhao B,Zhang H L.Application of Ansoft12 in engineering electromagnetic field[M].Beijing:China Water Resources and Hydropower Press,2010 (in Chinese)
[15] 刘国强,赵凌志,蒋继娅.Ansoft工程电磁场有限元分析[M].北京:电子工业出版社,2005Liu G Q,Zhao L Z,Jiang J Y.Finite element analysis of electromagnetic field in Ansoft engineering[M].Beijing:Electronic Industry Press,2005 (in Chinese)
[2] 叶湘滨,吕喜在.3段式差动变压器位移传感器的设计及优化[J].仪表技术与传感器,2004,(8):1-2Ye X B,Lv X Z.Design and optimization of three-section differential transformer used as displacement sensor[J].Instrument Technique and Sensor,2004,(8):1-2 (in Chinese)
[3] 钱谦,刘武发,郭松路.新型精密LVDT仿真分析[J].机械设计与制造,2014,(8):214-216Qian Q,Liu W F,Guo S L.Simulation analysis of the new type precise LVDT[J].Machinery Design & Manufacture,2014,(8):214-216 (in Chinese)
[4] 刘萍.差动变压器式位移传感器参数化仿真及优化[D].西安:西安电子科技大学,2010Liu P.Parametric simulation and optimization of linear variable differential transformer[D].Xi′an:Xidian University,2010 (in Chinese)
[5] 李瑞锋,冀宏,苏玛亮,等.次级线圈绕线锥度对LVDT线性度和灵敏度的影响[J].甘肃科学学报,2016,28(4):110-114Li R F,Ji H,Su M L,et al.Effect of coil winding taper on LVDT linearity and sensitivity[J].Journal of Gansu Sciences,2016,28(4):110-114 (in Chinese)
[6] Tian G Y,Zhao Z X,Baines R W,et al.Computational algorithms for linear variable differential transformers (LVDTs)[J].IEE Proceedings-Science,Measurement and Technology,1997,144(4):189-192
[7] Félix M,Lizárraga A,Islas A,et al.Analysis of a ferrofluid core LVDT displacement sensor[C]//Proceedings of the 36th Annual Conference on IEEE Industrial Electronics Society.Glendale,AZ,USA:IEEE,2010:1769-1772
[8] Kano Y,Hasebe S,Huang C,et al.New type linear variable differential transformer position transducer[J].IEEE Transactions on Instrumentation and Measurement,1989,38(2):407-409
[9] Chiriac H,Hristoforou E,Neagu M,et al.Linear variable differential transformer sensor using glass-covered amorphous wires as active core[J].Journal of Magnetism and Magnetic Materials,2000,215-216:759-761
[10] 贾惠霞,王健,张娟.差动变压器式位移传感器零位电压研究[J].仪表技术与传感器,2015,(2):82-84Jia H X,Wang J,Zhang J.Study on zero-point remainder voltage of differential transformer displacement sensor[J].Instrument Technique and Sensor,2015,(2):82-84 (in Chinese)
[11] 李瑞锋.高线性度液压阀用LVDT位移传感器的研究[D].兰州:兰州理工大学,2016Li R F.The research on linear variable differential transformer with high linearity for electrohydraulic valves[D].Lanzhou:Lanzhou University of Technology,2016 (in Chinese)
[12] 刘慧娟,上官明珠,张颖超,等.Ansoft Maxwell 13电机电磁场实例分析[M].北京:国防工业出版社,2014Liu H J,Shangguan M Z,Zhang Y C,et al.Ansoft Maxwell 13 motor electromagnetic field example analysis[M].Beijing:National Defense Industry Press,2014 (in Chinese)
[13] 苗晓燕.差动变压器式位移传感器的结构优化及其数字接口电路设计[J].组合机床与自动化加工技术,1999,(1):40-43Miao X Y.Structural optimization of differential transformer displacement sensor and digital interface circuit design[J].Modular Machine Tools & Automatic Machining Technology,1999,(1):40-43 (in Chinese)
[14] 赵博,张洪亮.Ansoft 12在工程电磁场中的应用[M].北京:中国水利水电出版社,2010Zhao B,Zhang H L.Application of Ansoft12 in engineering electromagnetic field[M].Beijing:China Water Resources and Hydropower Press,2010 (in Chinese)
[15] 刘国强,赵凌志,蒋继娅.Ansoft工程电磁场有限元分析[M].北京:电子工业出版社,2005Liu G Q,Zhao L Z,Jiang J Y.Finite element analysis of electromagnetic field in Ansoft engineering[M].Beijing:Electronic Industry Press,2005 (in Chinese)