Air-gap and mass eccentricity on dynamics of magnetic bearing rotor system

Eccentric vibration can present a potential risk to the lifetime and dynamic stability of maglev centrifugal air compressor (MCAC). Aiming at the support characteristics of a MCAC magnetic bearing rotor system (MBRS), a 5-dof dynamic model was established by constructing a complete closed-loop model of the system. The electromagnetic control system is expressed by the corresponding equivalent coefficient and equivalent damping. Considering mass eccentricity andair-gap eccentricity to the dynamic characteristics of MBRS, using New mark implicit integration numerical method and stability of the steady response simulation was discussed. The research has essential reference significance for the structural design and controller commissioning.