CAJ | 학술논문

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.
침대주동자현부축승(AMB)계통중여전속동빈적주기성불평형격려대계통은정성이급기타성능적영향,제출일충기우변보장최소균방산법작위전궤보상공제기적신적실시전궤자동평형책략.차공제기능구제공괄당적정현신호용래보상전자반궤위이신호중적여전속동빈적불평형향응,종이강저공제전류적파동이급감약AMB계통적주동공제작용.통과분석표준LMS산법원리이급기재AMB계통실시려파보상응용중적불족,득도신적여전속성비례적LMS산법보장인자.실험결과표명,해산법능구재일개관빈대내실현실시불평형력보상공제,유효강저불평형격려대계통기출적영향,위전자속도적진일보제고제공편리.
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 compensate the feedback unbalance response signals synchronous with the rotary frequency, then reduce the fluctuation 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.