磁悬浮复合转子章动模态的最优阻尼控制  

Optimal Damping Control for Nutation Mode of Magnetic Composite Rotor

作　　者：贾日波 郑世强[1,2,3] 陈琪[1,2,3] 

机构地区：[1]北京航空航天大学惯性技术重点实验室,北京100191 [2]北京航空航天大学新型惯性仪表与导航系统技术国防重点学科实验室,北京100191 [3]北京航空航天大学高速磁悬浮电机技术及应用工程技术研究中心,北京100191

出　　处：《轴承》2017年第8期24-31,共8页Bearing

基　　金：国家重大科学仪器设备开发专项(2012YQ040235)

摘　　要：为了抑制磁悬浮分子泵高速复合转子章动模态对稳定性的影响,提出了一种基于移相器的轴承力最优阻尼控制方法,建立了磁悬浮分子泵刚性复合转子的动力学模型,计算出转子闭环系统的最优控制相位,通过扫频检测闭环系统在临界转速处的滞后相位,定量获得系统的最优补偿相位,利用移相器对系统相位进行最优补偿,以保证系统在章动频率处的相位裕度,避免磁悬浮分子泵复合转子在高速下的章动失稳。经试验证明:采用最优阻尼控制方法,可使磁悬浮转子在高速运行时的章动模态幅值降低50%以上,对转子高速下的章动模态有较好的抑制效果。In order to restrain the effect of nutation mode of high speed composite rotor for magnetic molecular pump,an optimal damping control method based on phase shift filter（ PSF） is proposed. A dynamics model of rigid composite rotor of magnetic molecular pump is established,the optimal control phase of rotor closed-loop system is calculated,and the optimal compensating phase is obtained quantitatively after that the lagging phase of closed-loop system at critical speed is detected. Finally,the phase shift filter is used to compensate the phase of system to make it optimal,so that the phase margin of system in nutation frequency is insured and composite rotor of magnetic molecular pump will not lost running stability under high speed due to nutation mode. The experimental results show that the nutation amplitude reduces more than 50%. The optimal damping control method is useful to restrain the nutation mode.

关 键 词：磁悬浮分子泵 章动模态 最优阻尼控制 移相器 

分 类 号：TH133.3[机械工程—机械制造及自动化] O231[理学—运筹学与控制论]