轴向磁悬浮轴承位移检测技术研究

发布时间：2018-04-15 05:31

本文选题：磁悬浮轴承 + 电涡流　；参考：《南京理工大学》2011年硕士论文

【摘要】：拥有无摩擦、无磨损、无需润滑、低功耗,无噪声等优点的磁悬浮轴承在如今飞速发展的今天,其应用与需求是越来越广。磁悬浮轴承必须根据轴的悬浮状态不断地调节磁场力的大小才能使轴实现稳定地悬浮,其关键技术之一就是对转子位移的实时检测。本文研究用以轴向磁悬浮轴承控制系统系统的位移检测技术,根据系统的研制要求,主要对电涡流,电感,电容三种常用的位移检测方法进行了比较研究。在分析比较了各种电涡流检测电路原理的基础上,设计了调幅式的位移检测电路,对激励信号的频率、波形进行了实验分析研究,从提高位移检测灵敏度的角度考虑,确定了激励信号的频率和波形。设计了差动电容式位移检测系统。采取印制板技术制作电容极板,并将检测电路与电极做成一体,直接将位移变化导致的电容变化转变为电信号输出,大大减少了分布电容的干扰,并在结构上采取了屏蔽措施,克服了外界电磁干扰的影响,使系统检测的可靠性大大提高,并具有比较高的位移检测灵敏度。将电涡流和差动电容位移传感器应用于轴向磁悬浮轴承,进行实际的使用对比实验。根据实际效果,从安装的方便性考虑,电涡流传感器体积小,易于安装,而电容传感器体积偏大；从灵敏度考虑,差动电容传感器灵敏度高于电涡流传感器；从经济性考虑,电容位移检测系统较电涡流位移检测系统的成本低。就轴向磁悬浮轴承的位移检测的运用,差动电容较电涡流位移检测技术更为合适。
[Abstract]:With the advantages of no friction, no wear, no lubrication, low power consumption, no noise and so on, the application and demand of maglev bearing are more and more extensive.The magnetic bearing must constantly adjust the magnitude of magnetic field force according to the suspension state of the shaft in order to realize the stable suspension of the shaft. One of the key technologies is to detect the rotor displacement in real time.In this paper, the displacement detection technology of the control system of axial magnetic bearing is studied. According to the development requirements of the system, three commonly used displacement detection methods, eddy current, inductance and capacitance, are compared and studied.Based on the analysis and comparison of the principles of various eddy current detection circuits, an amplitude modulated displacement detection circuit is designed. The frequency and waveform of the excitation signal are experimentally analyzed and studied, and the sensitivity of displacement detection is considered from the point of view of improving the sensitivity of displacement detection.The frequency and waveform of the excitation signal are determined.A differential capacitance displacement detection system is designed.The PCB technology is adopted to make the capacitor electrode, and the detection circuit and the electrode are made into an integral whole. The capacitance change caused by the displacement change is transformed directly into the electrical signal output, which greatly reduces the interference of the distributed capacitance, and the shielding measures are taken in the structure.By overcoming the influence of external electromagnetic interference, the reliability of the system is greatly improved, and the sensitivity of displacement detection is relatively high.The eddy current and differential capacitance displacement sensor are applied to the axial magnetic bearing.According to the practical effect, considering the convenience of installation, the eddy current sensor is small in size and easy to install, while the capacitance sensor is larger in volume; considering the sensitivity, the sensitivity of differential capacitance sensor is higher than that of eddy current sensor, and considering the economy, the sensitivity of differential capacitance sensor is higher than that of eddy current sensor.The cost of capacitance displacement detection system is lower than that of eddy current displacement detection system.The differential capacitance is more suitable than the eddy current displacement detection technology for the displacement detection of axial magnetic bearing.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.3

【引证文献】