主动磁轴承系统建模与准谐振自抗扰振动抑制

Modeling of AMB system and quasi-resonant self-rejecting disturbance vibration suppression

为了建立更准确的磁轴承数学模型,优化其控制性能,对磁轴承的电磁力非线性特性和系统固有干扰源进行了分析,通过转子动力学分析建立了含干扰源的主动磁轴承径向耦合系统模型。为抑制系统的振动,提出了一种磁轴承准谐振自抗扰振动抑制方法。通过扩张状态观测器实现系统解耦,简化控制流程,提升系统抗干扰能力;在此基础上,并入准谐振控制器对正弦周期性振动进行抑制。与传统方法相比,该方法控制结构简单,所需整定参数较少。仿真与试验结果表明,所提方法可以有效降低转子位移振动幅值,系统内常见的1、3、5倍频周期性振动得到显著抑制,具有良好的振动抑制效果。

Here,to establish a more accurate mathematical model of active magnetic bearing(AMB)and optimize its control performance,nonlinear electromagnetic force characteristics of AMB and the system’s inherent interference source were analyzed.Through rotor dynamic analysis,the radial coupled system model of AMB with interference source was established.A quasi-resonant self-rejecting disturbance vibration suppression method for AMB was proposed to suppress the system vibration.The extended state observer was used to decouple the system,simplify control process,and improve the system’s anti-interference ability.Then,a quasi-resonant controller is incorporated to suppress sinusoidal periodic vibration.Compared with traditional methods,this method has a simple control structure and requires fewer tuning parameters.Simulation and experimental results showed that the proposed method can effectively reduce amplitude of rotor displacement vibration,and significantly suppress common 1 st,3 rd and 5 th order harmonic periodic vibrations in the system,so it has the good vibration suppression effect.