基于LMS算法的磁悬浮轴承系统振动补偿

主动磁悬浮轴承转子高速旋转时会对系统产生周期性不平衡激振力响应,此响应会降低系统的控制精度、稳定性以及限制转子速度的提高等.针对此响应对系统的影响,首先,从轴承转子机械特性及系统控制过程分析系统周期性力产生的原因;其次,以振动在系统控制过程中体现的正弦形式信号为处理对象,采用最小均方差(LMS)算法与数字PID联合控制的方法实现滤波补偿;然后,通过分析定步长LMS算法与PID参数及被处理信号的频率的相互影响,提出了一种依据转子位移信号频率变化而实时变频切换补偿的控制策略;最后通过实验台实验验证了方法的有效性,为轴承转速的进一步提高奠定基础.

Real-time vibration compensation for active magnetic bearing systems based on LMS algorithm

When the rotor of active magnetic bearing (AMB) systems rotates at high-speed, periodic vibration response can be generated in the systems, which can reduce system control precision, stability and limit the rotor speed, etc. For the vibration response in the systems, firstly, the causes of periodic vibration are analyzed from the Mechanical properties of rotor and the process of control system ; secondly, the sinusoidal signal of vibration embodied in the system control process is treated as an objective, and PID controller combined with least mean square (LMS) algorithm is adopted to adaptive filter thirdly, by analyseing the fixed step size LMS algorithm, the PID parameters and the frequency interaction of the signals, one real-time switching compensation control strategy according to the frequency is presented. The effectiveness of the method is demonstrated through experiments, which the foundation for the speed increase of AMB system.