油液磨粒检测传感器线圈间距对输出信号的影响

Influence of Coil Spacing on Output Signal of Oil Abrasive Particle Detection Sensor

电感式磨粒传感器在机械设备润滑油液磨粒在线监测中具有独特优势,通过测量传感器输出的感应电压信号来获取油液中磨粒的大小、数量以及质量等信息,进而可实现设备磨损程度的判断。为了研究电感式三线圈传感器中相邻两线圈之间的距离对传感器输出感应信号的影响,基于差动式三线圈互感原理建立传感器三维模型;利用JMAG-Designer12.0软件对传感器检测铁磁磨粒的过程进行瞬态电磁仿真,分析线圈间距对传感器输出感应电动势的影响;通过制作传感器进行实验并行验证仿真结果的正确性。研究结果表明,当线圈间距小于2.5 mm时,感应电动势随间距的增加而增大,当线圈间距大于2.5 mm时,感应电动势随间距的增加而减小,线圈间距为2.5 mm时,感应电动势最大,传感器输出信号与理论正弦信号变化趋势接近一致,并且信号干扰最小、信号最为稳定。

The inductive abrasive sensor has unique advantages in the application of on-line monitoring of lubricating oil and abrasive particles in mechanical equipment.The size,quantity and quality of abrasive particles in oil can be obtained by measuring the inductive voltage signal output by the sensor,and then the wear degree of equipment can be judged.In order to study the influence of the distance between two adjacent coils on the output induction signal of the inductive three coil sensor,a three-dimensional model of the sensor was established based on the principle of differential three coils mutual inductance.The transient electromagnetic simulation of the sensor s detection process of ferromagnetic abrasive particles was carried out by using the software JMAG-Designer 12.0.The influence of coil distance on the output induction electromotive force of the sensor was analyzed.The rationality of the simulation results was verified by making sensors for experiments.The results show that when the coil spacing is less than 2.5 mm,the electromotive force is increased with the increase of the coil spacing,when the coil spacing is greater than 2.5 mm,the electromotive force is decreased with the increase of the coil spacing,when the coil spacing is 2.5 mm,the sensor has the largest electromotive force,the change trend of the sensor output signal is close to that of the theoretical sinusoidal signal,and the signal interference is the smallest and the signal is most stable.