Rotor Dynamic Analysis on the Bearing-rotor System of Magnetic Centrifugal Compressor

Modal frequency and modal vibration mode of a centrifugal compressor rotor-bearing system, which equipped with magnetic bearings, are significant target parameters to insure stable operation of the compressor. Meanwhile, calculations and optimizations of those parameters are also necessary processes of compressor structure designing. In this paper, basing on the basic theories of rotor dynamics, ANSYS is used to analyze vibration mode and modal frequency of a compressor rotor-bearing system. The correction coefficient of modulus of elasticity of laminated and basic excitation sources caused by impellers in pneumatic section and magnetic bearings’ stiffness parameters are considered when doing rotor dynamics modeling simultaneously throughout the simulation. Influences on critical speed of the rotor-bearing system caused by rotor speed is analyzed through the simulation. It has provided a reference to designing shafts in long axis system of magnetic high-speed centrifugal compressor by obtaining the simulation results.