College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China.
Sensors (Basel). 2023 Apr 3;23(7):3703. doi: 10.3390/s23073703.
A dual-coil inductive displacement transducer is a non-contact type measuring element for measuring displacement and is widely used in large power equipment systems such as construction machinery and agricultural equipment. However, the effect of the coil excitation method on the performance of dual-coil inductive displacement sensors has not been studied. This paper investigates the impact of different coil excitation methods on the operating performance of displacement transducers. The working principle, electromagnetic characteristics, and electrical characteristics were analyzed by building a mathematical model. A transducer measurement device was used to determine the relationship between core displacement and coil inductance. Three coil excitation methods were proposed, and the effects of the three coil excitation methods on the amplitude variation, phase shift, linearity, and sensitivity of the output signal were studied by simulation based on the AD630 chip as the core of the conditioning circuit. Finally, the study's feasibility was demonstrated by comparing the experiment to the simulation. The results show that, under the uniform magnetic field strength distribution in the coil, the coil voltage variation is proportional to the inductive core displacement. The amplitude variation is the largest for the dual-coil series three-wire (DCSTW) and is the same for the dual-coil series four-wire (DCSFW) and dual-coil parallel differential (DCPD). DCSFW has an enormous phase shift. DCSTW has the best linearity. The research in this paper provides a theoretical basis for selecting a suitable coil excitation, which is conducive to further improving the operating performance of dual-coil inductive displacement transducers.
一种双线圈电感式位移传感器是一种非接触式测量元件，用于测量位移，广泛应用于工程机械和农业设备等大功率设备系统中。然而，线圈激励方式对双线圈电感式位移传感器性能的影响尚未得到研究。本文研究了不同线圈激励方式对位移传感器工作性能的影响。通过建立数学模型，分析了工作原理、电磁特性和电气特性。使用传感器测量装置确定了磁芯位移与线圈电感之间的关系。提出了三种线圈激励方法，并基于 AD630 芯片作为调理电路的核心，通过仿真研究了这三种线圈激励方法对输出信号的幅度变化、相移、线性度和灵敏度的影响。最后，通过实验与仿真的比较验证了研究的可行性。结果表明，在线圈的磁场强度分布均匀的情况下，线圈电压变化与电感磁芯位移成正比。在双线圈串联三线（DCSTW）激励方式下，幅度变化最大，而在双线圈串联四线（DCSFW）和双线圈并联差分（DCPD）激励方式下，幅度变化相同。DCSFW 具有巨大的相移。DCSTW 具有最佳的线性度。本文的研究为选择合适的线圈激励方式提供了理论依据，有利于进一步提高双线圈电感式位移传感器的工作性能。
