基于相移陷波器的磁轴承不平衡振动全频自适应控制

Adaptive control of unbalance vibration for magnetic bearings based on phase-shift notch filter within the whole frequency range

为全转速范围内消除磁悬浮转子不平衡质量产生的不平衡振动力,提出基于相移陷波器的不平衡振动全频自适应控制方法。直接以构造的轴承力作为相移带通滤波器输入,将滤波器输出反馈至控制系统构成相移陷波器,达到消除振动力目的。该过程无需考虑功放低通特性对同频成分影响;通过对系统灵敏度函数理论分析,在不同转速下自适应调节相移角,实现全转速范围内系统稳定。结果表明,该方法能在全频范围内有效地消除同频轴承力。

The mass unbalance of high-speed magnetically suspended rotor causes unbalance force,which induces synchronous vibration. To suppress the vibration effectively within the operating speed range,a method based on a phaseshift notch filter was proposed. The control strategy of the method is that the magnetic bearing force was calculated and taken as the input of the phase-shift band-pass filter and the output of the filter was fed back to the original system,in which the low-pass characteristic of power amplifier doesn＇t need to be considered. Meanwhile,based on the theoretical analysis on the sensitivity function of the overall control system,a stable system in the rotating speed range was achieved based on the adaptive adjustment of phase shift in the band-pass filter with respect to rotor speed. The experimental results show the effectiveness of the proposed approach,which can reduce the synchronous magnetic bearing force within the whole frequency range.