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中文摘要：
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。
英文摘要：
Aiming at the stability and others properties of active magnetic bearing （AMB） system influenced by the periodic unbalance stimulation synchronous with rotor rotational speed, a new real-time adaptive feed-forward unbalance force compensation scheme is proposed based on variable step-size least mean square（LMS） algorithm as the feed-forward compensation controller. The controller can provide some suitable sinusoidal signals to com- pensate the feedback unbalance response signals synchronous with the rotary frequency, then reduce the fluctua- tion of the control currents and weaken the active control of AMB system. The variable step-size proportional to the rotational frequency is deduced by analyzing the principle of normal LMS algorithm and its deficiency in the application of real-time filtering of AMB system. Experimental results show that the new method can implement real-time unbalance force compensation in a wide frequency band, reduce the effect of unbalance stimulant force on the housing of AMB system, and provide convenience to improve rotational speed.
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