复杂结构振动对磁悬浮轴承性能影响的研究

Influence of Complex Structure Vibration on Performances of Active Magnetic Bearing

复杂结构的振动造成磁悬浮轴承相对运动控制系统的参考位置(基准)出现偏差,影响磁悬浮主轴的加工精度。因此,有必要预测、评估复杂结构的振动对磁悬浮主轴精度的影响。以弹性梁+磁悬浮主轴为研究对象,通过建立系统模型和理论分析,得出弹性基础振动对相对运动控制磁悬浮主轴性能的影响规律。并得出结论:控制策略不能局限于相对运动控制,控制器的设计必须考虑复杂弹性结构振动的影响,将复杂结构的振动信号也作为反馈变量。

Actually, all the active magnetic beating（AMB） spindies are mounted on the complex structures. The complex structure vibration will lead to reference position（ or datum）deviation of the AMB with relative motion control system, which has a great influence on the machining precision of the AMB spindle. For this reason, it is necessary to foracast and evaluate the influence of the complex structure vibration on the precision of the AMB spindle. By means of modeling an AMB spindle mounted on an elastic beam and making theoretical analysis, the relationship between the elastic foundation vibration and the performances of the AMB spindle with relative motion control system is obtained. The simulation results show that the control strategy of the AMB should not be confined to the relative motion control, on the contrary, the foundation vibration must be taken into account in the design of the AMB controller, namely, the complex structure vibration signals must also be taken as the feedback variables.