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针对主动磁悬浮轴承(AMB)系统中与转速同频的周期性不平衡激励对系统稳定性以及其他性能的影响,提出一种基于变步长最小均方算法作为前馈补偿控制器的新的实时前馈自动平衡策略。此控制器能够提供适当的正弦信号用来补偿转子反馈位移信号中的与转速同频的不平衡响应,从而降低控制电流的波动以及减弱AMB系统的主动控制作用。通过分析标准LMS算法原理以及其在AMB系统实时滤波补偿应用中的不足,得到新的与转速成比例的LMS算法步长因子。实验结果表明,该算法能够在一个宽频带内实现实时不平衡力补偿控制,有效降低不平衡激励对系统基础的影响,为转子速度的进一步提高提供便利。
Aiming at the influence of periodically unbalanced excitation with the same frequency on the stability and other performance of the system in active magnetic suspension bearing (AMB) system, a new real-time based on variable step size least mean square algorithm is proposed as a feedforward compensation controller Feedforward automatic balancing strategy. The controller can provide the appropriate sinusoidal signal to compensate for the imbalance response of the rotor feedback displacement signal at the same frequency as the speed, thereby reducing the control current fluctuation and weakening the active control of the AMB system. By analyzing the principle of standard LMS algorithm and its shortcomings in the application of AMB system real-time filter compensation, a new speed factor proportional to LMS algorithm is obtained. The experimental results show that the proposed algorithm can compensate and control real-time unbalanced force in a wide frequency band and reduce the influence of unbalanced excitation on the system foundation, which can facilitate the further improvement of rotor speed.