为了提高电感检测传感器对于非铁磁性金属磨粒的检测精度, 提出了一种可实现电感和电阻参数检测的磨粒检测传感器。所设计的传感器主要由紧密贴合的环状硅钢片和平面电感线圈构成, 硅钢片的加入增强了检测区域的磁场强度, 使得金属颗粒的磁化效应和涡流效应更加剧烈, 从而提高了电感和电阻检测精度。通过对比实验发现, 环状硅钢片在提升检测精度的同时, 并未增加电感及电阻检测信号的噪声; 且电感检测和电阻检测都对铁磁性金属颗粒具有更强的检测能力; 对于铁磁性金属颗粒, 电感检测更为有效; 但对于非铁磁性金属颗粒, 电阻检测更为有效。将电感检测结果和电阻检测结果相结合, 则可使用20匝的平面电感线圈实现对55 μm铁颗粒和115 μm铜颗粒的检测。本文提出的磨粒检测传感器可为液压油污染物的在线监测提供了技术支持。

A wear debris detection sensor used to detect inductance and resistance parameters was presented, which could improve the detection sensitivity of the inductive sensor for nonferromagnetic metal particles. The designed sensor mainly consisted of a ring silicon steel sheet and planar coil. The silicon steel sheet enhanced the magnetic field strength of the detection region, making the magnetization effect and eddy current effect of the metal particles more intense, thereby improving the sensitivity of inductance and resistance detection. Through comparative experiments, it was found that the ring silicon steel sheet does not increase the noise of the inductance and resistance detection signals; and both the inductance and resistance detection capability are stronger for ferromagnetic metal particles. For ferromagnetic metal particles, inductance detection is more effective; for nonferromagnetic metal particles, resistance detection is more effective. By combining the inductance detection and resistance detection results, 55 μm iron particles and 115 μm copper particles can be detected using a planar coil with 20 turns. The wear debris sensor provides technical support for online monitoring of hydraulic oil contaminants.