高稳定性磁悬浮轴承电控系统研究

发布时间：2018-01-12 22:16

本文关键词：高稳定性磁悬浮轴承电控系统研究　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：通过对自然界磁现象的长时间地研究与积累,人们可以对磁场进行精确控制并加以利用,磁悬浮轴承就是其中典型的代表。相比于传统机械轴承,利用电磁力实现转子无接触支撑的磁悬浮轴承在应用方面具有无损耗、无需润滑等优势,因此磁悬浮轴承在工业应用中具有巨大潜力。作为磁悬浮轴承的核心,电控系统一直是研究的重点与难点,本文主要研究了主动式磁悬浮轴承系统的电控系统包括位移检测与控制系统。本文首先根据磁悬浮轴承位移检测的特点分析了位移检测的要求,选择了电涡流式位移传感器,并根据电涡流位移传感器的原理设计了差动位移检测电路,然后对检测电路的主要指标做了实验与理论分析,结果表明检测电路在灵敏度、稳定性与动态特性方面均满足要求。接着对控制系统进行了分析并设计包括PID控制电路与功率放大电路,研究了功率放大电路主要参数直流母线电压与开关频率的大小对整个系统性能的影响,然后对所设计的控制系统进行建模,通过实验与对系统闭环传递函数的分析给出了 PID参数整定的方法使得转子可以稳定悬浮,通过Matlab仿真了解PID参数对控制性能的影响,最后通过实验验证了磁悬浮轴承的稳定性与抗干扰能力可以取得令人满意的效果。
[Abstract]:By studying and accumulating the magnetic phenomena in nature for a long time, people can accurately control the magnetic field and use it. The magnetic bearing is a typical example, compared with the traditional mechanical bearing. Using electromagnetic force to realize the rotor without contact support magnetic bearing has the advantages of no loss and no lubrication in application, so magnetic suspension bearing has great potential in industrial application. It is the core of magnetic suspension bearing. Electronic control system has been the focus and difficulty of the research. This paper mainly studies the electronic control system of active magnetic bearing system, including displacement detection and control system. Firstly, according to the characteristics of magnetic suspension bearing displacement detection, the requirements of displacement detection are analyzed. The electric eddy current displacement sensor is selected and the differential displacement detection circuit is designed according to the principle of the eddy current displacement sensor. The results show that the detection circuit meets the requirements in sensitivity, stability and dynamic characteristics. Then, the control system is analyzed and designed, including PID control circuit and power amplifier circuit. The effect of DC bus voltage and switching frequency on the system performance is studied, and the control system is modeled. Through the experiments and the analysis of the closed-loop transfer function of the system, the method of PID parameter tuning is given to make the rotor suspension stably. The influence of PID parameters on the control performance is studied by Matlab simulation. Finally, the stability and anti-interference ability of maglev bearing are verified by experiments.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.3;TP273

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