LVDT位移傳感器的設計及仿真研究

機械設計制造及其自動化論文，論文編號:JX1243  論文字數:11700.頁數:49

摘     要
 LVDT位移傳感器是測量線性位移量的主要手段之一，在工業領域，特別是自動控制領域得到了廣泛的應用。本文首先從LVDT位移傳感器的原理出發，利用QuickField軟件進行有限元建模仿真，得到LVDT位移傳感器的阻抗與檢測距離的關系，從而可得到經過測量電路后的輸出電壓受位移變化的影響。仿真結果表明基于QuickField的有限元分析法對LVDT位移傳感器設計有重要指導意義。
 LVDT位移傳感器的參數變化對其性能的影響是比較顯著的，因此設計LVDT位移傳感器的關鍵在于對傳感器參數進行優化分析，在得到各種互感曲線的基礎上，定性地分析幾種主要參數變化對LVDT位移傳感器的影響。本研究成果為傳感器優化分析提供了有利的方法和手段。
 本論文主要分為四章，各章內容總結如下：
.LVDT位移傳感器測量特性存在非線性，了解這種非線性變化機理是   提高LVDT位移傳感器測量性能的至關重要的一個環節。
.LVDT位移傳感器的構成形式及部件設計。由于互感磁場的復雜性以及不均勻性，直接推導和建立準確的數學模型存在很大的困難和障礙。
.應用有限元技術建立了以螺旋式差動變壓器的三段型線圈為特征的傳感器電磁模型，進行仿真最終合成得出傳感器線圈電感參數隨銜鐵位移變化規律以揭示非線性機理，最后得出仿真結果。
.提供理論依據，為這種傳感器的進一步廣泛應用提供了有利的分析方法和手段。
 
 關鍵字: LVDT位移傳感器  有限元分析  QuickField 
 
  Abstract
 LVDT displacement transducer is a main mean to measure the linear displacement,it has been widely used in the industrial, especially in the field of automatic control. This article start from the LVDT displacement transducer principle, by using QuickField in finite element modeling and simulation, getting the relationship between resistance and detection range of LVDT displacement sensor .Then to get  output voltage by changing the displacement. The simulation results show that basing on the finite element method of QuickField have important guiding significance to LVDT displacement sensor.     The influence of changing parameters to LVDT displacement sensor on performance is more significant, so the key to design LVDT displacement transducer is to optimize the parameters of the sensor. The simulating results indicated that short length of winding, large width of winding and small distance between winding and reflector can bring better sensitivity. The results will provide useful method for the optimization of LVDT displacement sensor. The results of studying provides the optimal sensor a favorable method and means.
 The thesis is divided into four chapters, each chapter are summarized as follows:
 Chapter I. LVDT displacement sensor characteristics of the nonlinear, it’s a key to understand the mechanism will improve the LVDT linear displacement sensor performance.
 Chapter II.The design of LVDT displacement sensor components. As the magnetic field exists inhomogeneity, there are great difficulties and obstacles to give an accurate mathematical models.
 Chapter III.Using finite element technology to establish a differential transformer with spiral coil characterized by three sections, simulate the final synthesis parameters of sensor coil mutual inductance variation with armature displacement to reveal the nonlinear mechanism.at last,get the results of simulation.
 Chapter IV.A theoretical basis for the further of this sensor will provide a favorable method and means.    
Key words:  LVDT displacement transducer  Finite element analysis  QuickField