关键词: 主动磁力轴承, 挠性转子, 模态, 振型, 支承刚度

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