摘要
应用磁悬浮原理把永磁体组件组合成一种振动传感器,用ANSYS对永磁体进行物理磁力仿真,计算出悬浮磁力影响因素的主次顺序。根据磁路定理推导出悬浮磁力的表达式,通过ANSYS数值仿真验证磁力公式,发现在微小位移范围内理论结果与仿真结果比较吻合,并且悬浮磁铁的振幅和所受磁力呈线性关系。同时推导出传感器系统的二阶动力学方程。用标准激振器标定传感器的灵敏度为213V·s·m-1,高于传统磁电式传感器的灵敏度。用此传感器采集低频振动信号,该传感器可以很好地应用于低频振动信号的采集。
A vibration sensor is made of permanent magnet components based on levitation theory, magnetic force simulation on permanent magnet component is carried out applying ANSYS, the optimal combination of factor order which affects the magnetic force can be found. According to theory of magnetic circuits, magnetic force formula can be derived, and magnetic force formula is verified by ANSYS simulation, it can be found that within the area of micro displacement, simulation value is fit to theoretical value, and there is a linear relationship between amplitude and magnetic force of hybrid magnet. Second order equations in dynamics of sensor system can be derived. After testing of the vibration sensor through standard vibrator, the sensitivity is 213 V · s· m-1, which is higher than traditional magnetoelectric sensor. The sensor is used for collecting low frequency vibration signal very well.
出处
《传感器与微系统》
CSCD
北大核心
2013年第10期61-64,共4页
Transducer and Microsystem Technologies
