【摘要】 运用PCB线圈作为感应元件的铁磁传感器越来越成熟，但PCB线圈由于其结构限制，使得铁磁颗粒不能通过其检测区域，另也没有相关研究证实PCB线圈对于铁磁颗粒测量的精确性。为此提出一种基于磁塞与电感检测原理的新型铁磁传感器。使用有限元仿真软件COMSOL Multiphysics建立传感器的仿真模型，对PCB线圈的磁场分布进行仿真分析。结果表明：PCB线圈表面磁场强度具有良好的均匀性，适当减小PCB线圈的内径，有利于提高PCB线圈的磁场均匀性。基于仿真分析结果，设计5种不同尺寸规格的PCB线圈，并设计实验验证该传感器的检测精度。实验结果表明：该传感器具有良好的灵敏度，能有效检测出粒径100μm以下的铁磁颗粒。更多还原

【Abstract】 Ferromagnetic sensors using PCB coils as sensing elements are becoming more and more mature.However, due to the structural limitations of PCB coil, ferromagnetic particles cannot pass through its detection area.In addition, there is no relevant research to confirm the accuracy of the PCB coil for the measurement of ferromagnetic particles.A new type of ferromagnetic sensor based on the principle of magnetic plug and inductance detection was proposed.The simulation model of the sensor was established by using the finite element simulation software COMSOL Multiphysics, and the magnetic field distribution of the PCB coil was simulated and analyzed.It is found that the magnetic field intensity on the surface of the PCB coil has good uniformity, and reducing the inner diameter of the PCB coil appropriately is beneficial for improving the magnetic field uniformity of the PCB coil.Based on the simulation results, five kinds of PCB coils with different sizes were designed, and the detection accuracy of the sensor was measured by experiments.Experimental results show that the sensor has good sensitivity and can effectively detect the ferromagnetic particles smaller than particle size of 100 μm.更多还原