LVDT位移传感器的设计及仿真研究

机械设计制造及其自动化论文，论文编号:JX1243  论文字数:11700.页数:49

摘     要
 LVDT位移传感器是测量线性位移量的主要手段之一，在工业领域，特别是自动控制领域得到了广泛的应用。本文首先从LVDT位移传感器的原理出发，利用QuickField软件进行有限元建模仿真，得到LVDT位移传感器的阻抗与检测距离的关系，从而可得到经过测量电路后的输出电压受位移变化的影响。仿真结果表明基于QuickField的有限元分析法对LVDT位移传感器设计有重要指导意义。
 LVDT位移传感器的参数变化对其性能的影响是比较显著的，因此设计LVDT位移传感器的关键在于对传感器参数进行优化分析，在得到各种互感曲线的基础上，定性地分析几种主要参数变化对LVDT位移传感器的影响。本研究成果为传感器优化分析提供了有利的方法和手段。
 本论文主要分为四章，各章内容总结如下：
.LVDT位移传感器测量特性存在非线性，了解这种非线性变化机理是   提高LVDT位移传感器测量性能的至关重要的一个环节。
.LVDT位移传感器的构成形式及部件设计。由于互感磁场的复杂性以及不均匀性，直接推导和建立准确的数学模型存在很大的困难和障碍。
.应用有限元技术建立了以螺旋式差动变压器的三段型线圈为特征的传感器电磁模型，进行仿真最终合成得出传感器线圈电感参数随衔铁位移变化规律以揭示非线性机理，最后得出仿真结果。
.提供理论依据，为这种传感器的进一步广泛应用提供了有利的分析方法和手段。
 
 关键字: LVDT位移传感器  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