Abstract:

Based on an experimental maglev flexible rotor, a rotor modal design method was discussed by employing ANSYS software. The influence of the bearing stiffness on the rotor modal frequency and modal shape was analyzed. Upon the above work, the setting principle of the bearing stiffness was studied for the maglev flexible rotor, which will pass across its critical speeds. And the proper range of the bearing stiffness for the experimental maglev flexible rotor was obtained. The study results include that one influence factor on the controllability and observability of rotor mode is the ratio of the length sum of the radial magnetic bearing rotor and rotor displacement detection ring to the total length of the rotor; the bearing stiffness influences the rotor modal frequencies and the rotor modal shapes. And the very high bearing stiffness can worsen the controllability and observability of modes severely, and even can cause the maglev rotor unstable when passing across critical speeds.

Key words: active magnetic bearing(AMB), flexible rotor, mode, modal shape, bearing stiffness

摘要：

以一台磁悬浮挠性实验转子为例,结合ANSYS软件,探讨了磁悬浮挠性转子的模态设计方法,研究了支承刚度对转子模态频率和模态振型的影响,在此基础上,分析了过临界转速的磁悬浮挠性转子支承刚度的设定原则,并给出了磁悬浮实验转子的合理支承刚度范围。研究表明：影响转子模态可观性和可控性的一个重要因素是径向磁力轴承转子和位移检测环的长度之和与转子总长度的比值;支承刚度除了影响转子的模态频率外,还影响转子的模态振型,并且当支承刚度高到一定程度后,模态的可控性和可观性严重恶化,甚至可能导致磁悬浮转子过临界转速时失稳。

关键词: 主动磁力轴承, 挠性转子, 模态, 振型, 支承刚度