一种磁悬浮轴承支承刚性转子现场动平衡方法

A Filed Dynamic Balancing Method for Rigid Rotor Supported by Magnetic Bearings

该文提出一种基于扩张状态观测器的磁悬浮轴承支承刚性转子的现场动平衡方法。根据磁悬浮转子的运动方程,设计扩张状态观测器,由对象系统的输入输出信息即可估算旋转时系统所受的扰动力,并给出离散状态下观测器的收敛条件。为了去除系统倍频扰动和噪声信号对估测结果的影响,设计开关电容滤波器,用于提取扰动中的转速同频分量。针对系统中存在的误差,采用系数矩阵迭代优化方法克服开环观测的不足以提高动平衡精度。该方法在实际使用中仅需试重一次即可得到优化系数矩阵,再经过两次配重,转子不平衡质量显著降低。在机组长期运行时,该方法可部署于微处理器中,实时监测转子不平衡量,起到预警、指导动平衡的作用。

In this paper,a filed dynamic balancing method based on an extended state observer for magnetic bearing supporting rigid rotor is proposed.According to the equation of motion of the rotor supported by magnetic bearings,the extended state observer is designed.The dynamic disturbance of the system can be estimated by the input and output information of the target system.And the convergence conditions of the observer in discrete state are given.In order to remove the influence of multiple frequency disturbance and noise signals on the estimation results,a switched capacitor filter is designed to extract the synchronous component in the disturbance.For the errors existing in the system,the coefficient matrix iterative optimization method is used to improve the dynamic balance accuracy.In the actual use,this method can calculate the matrix of the optimization coefficient only through once trial weighting.And after balancing twice,the unbalanced mass of the rotor is significantly reduced.When the unit is in long-term operation,this method can be deployed in the microprocessor to monitor the rotor unbalance,which plays the role of early warning and guidance of the dynamic balancing.