主动电磁轴承–刚性转子系统实时变步长迭代不平衡补偿

A Real-time Variable Step Size Iterative Unbalance Compensation for Active Magnetic Bearing-rigid Rotor Systems

在许多对转子位移精度有高要求的场合中,需要转子的振动尽可能小。然而由转子材质不均匀、加工误差、变形等产生的转子不平衡量将会导致转子出现不平衡振动,最终影响到控制精度。该文首先建立轴对称主动电磁轴承–刚性转子系统的动力学模型,然后基于不平衡补偿原理得到补偿电流的表达式,最后提出一种基于转子不平衡系数实时变步长多边形迭代搜寻算法的不平衡补偿器,利用不平衡补偿器使轴承产生一个与转子的不平衡力大小相等、方向相反的控制力,实现转子的不平衡振动补偿。理论仿真和实验结果都表明,所提出的不平衡补偿方法可以有效地抑制转子的振动。

It＇s necessary to avoid the vibration of the rotor in some cases which need high displacement precision of the rotor in operation. However, the unavoidable rotor imbalance will lead to unbalance vibration. The dynamic model of an axially symmetric active magnetic bearing（AMB）-rigid rotor system was established, and then the specific form of the compensating current was obtained. At last, an unbalance compensator based on real-time variable step size polygon iterative seeking algorithm for unbalance coefficients of the rotor was proposed. With the compensator, the bearing can produce additional forces which are of same magnitudes but opposite phases as the unbalance forces. Simulations and experiments results confirmed the validity of the proposed method in suppressing the unbalance vibration of the rotor system.