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磁悬浮轴承广泛用于高速旋转机械,磁悬浮轴承的支承特性对研究该系统的动力学问题具有重要影响。提出了准确地测量轴向磁悬浮轴承支承参数的通用方法,为磁悬浮轴承转子系统动力学仿真分析、优化设计提供了可靠的建模依据。以一轴向磁悬浮轴承为例,首先在理论上计算了力-电流系数和力-位移系数,然后采用载荷法进行实验测定,实验结果略小于理论计算结果,因为实际系统存在漏磁,所以这是合理的。实验测定磁悬浮轴承刚度阻尼的方法主要是利用外部激振力对系统的激振和测试得到的系统响应之间的关系来识别,采用力锤脉冲激振法,从轴向磁悬浮轴承稳定悬浮下的频响函数中,测出系统的刚度约为4.55×106N/m,阻尼约为748N.s/m。
Magnetic bearings are widely used in high-speed rotating machinery. The bearing characteristics of magnetic bearings play an important role in studying the dynamics of this system. A general method for accurately measuring the bearing parameters of axial magnetic bearings is proposed. It provides a reliable basis for the modeling and optimization of the rotor system dynamics of magnetic bearings. Taking an axial magnetic bearing as an example, the force-current coefficient and force-displacement coefficient are calculated theoretically, and then the load method is used to test the experiment. The experimental results are slightly less than the theoretical calculation. Because the actual system has magnetic flux leakage, Is reasonable. The method of experimentally determining the stiffness damping of magnetic suspension bearings is mainly to identify the relationship between the excitation of the system and the system response obtained by the test by using the external excitation force. By using the method of force pulsation excitation, from the suspension of the axial magnetic suspension bearing Frequency response function, the measured system stiffness of about 4.55 × 106N / m, the damping is about 748N.s / m.