磁悬浮轴承系统的模型辨识与控制  

Model Identification and Control of Active Magnetic Bearing System

作　　者：周亮 甘杨俊杰 ZHOU Liang;GAN-YANG Junjie(CRRC Zhuzhou Electric Co.,Ltd.,Zhuzhou 412000,China)

机构地区：[1]中车株洲电机有限公司,湖南株洲412000

出　　处：《轴承》2021年第1期1-6,共6页Bearing

基　　金：国家重点研发计划项目(SQ2018YFB060213)。

摘　　要：对某磁悬浮轴承系统进行了理论建模,并进行了试验。由于建模时忽略了功率放大器和位移传感器的影响,磁悬浮轴承系统理论模型与其实际特性有较大差异,磁悬浮轴承系统是一个三阶模型,而非理论模型的二阶模型,基于理论模型设计的控制器难以获得较好的控制性能,建模时需考虑功率放大器和位移传感器的影响。为优化控制性能,采用频域辨识法对实际系统进行模型辨识,得到系统的频率特性,并对辨识数据进行模型拟合。在辨识得到的三阶模型基础上,采用极点配置法重新设计控制器,对转子进行悬浮控制,转子稳定悬浮时的位移波动量降低了约60%。The theoretical model is set up and experiment is carried out for an active magnetic bearing system.There is a large difference between theoretical model and actual characteristics of active magnetic bearing system due to neglecting the effect of power amplifier and displacement sensor during modeling,which the model of active magnetic bearing system is a third-order model rather than a second-order model by theoretical modeling,and the controller designed based on theoretical model is difficult to obtain good control performance,the effect of power amplifier and displacement sensor should be taken into account during modeling.In order to optimize the control performance,the model identification is carried out for actual system by using frequency domain identification method.The frequency characteristics of the system are obtained,and the model fitting is carried out for identified data.Based on third-order model obtained by identification,the controller is redesigned to suspend the rotor by adopting pole assignment method.The displacement fluctuation is reduced about 60%when the rotor is suspended stably.

关 键 词：磁悬浮轴承 滑动轴承 控制器 模型辨识 传递函数 

分 类 号：TH133.3[机械工程—机械制造及自动化] TP273[自动化与计算机技术—检测技术与自动化装置]