Analysis on System Dynamic Performance of Flexible Rotor Supported with Active Magnetic Bearings

When active magnetic bearing (AMB) is put into use of the industrial fields, there are many problems to be solved before using it, such as system security, reliability and stability when the rotors work on high rotation speed. In China, AMB is going to be used for some applications, for example, turbo expander, and grinding spindle and aircraft engine. This paper deals with the rotor dynamics of the systems, in which rotors are supported with AMBs and have high rotation speed. On which it is focused that the method to solve the problems above is combination between the traditional theories of rotor dynamics and the control theories of AMB system. The analysis and calculation results is presented here and to be used into a 150M3 oxygen gas expander. Meanwhile, the process and result of experiment are described in detail, in which the rotor speed reaches 95000r/min.