Simulation on Decoupling Control of Maglev Flexible Rotor System

At present, the decoupling control research on maglev rotor systems is mainly based on rigid rotor systems, but the elastic mode of the rotor cannot be ignored under high speed and high support stiffness. Aiming at the decoupling control problem of maglev flexible rotors, this paper first built a flexible rotor model, simplified the model by modal truncation method, and obtained the decoupled system through state feedback decoupling; then an internal model controller was designed based on the decoupled system, and the state observer was designed according to the characteristic that the state variables were not easily obtained by the sensors; finally, the decoupling effect of the system was simulated. The simulation results show that the displacement response of the uncoupled system contains multiple frequency components related to the natural frequency of the system, while that of the decoupled system only contains the same frequency component of the excitation; the mechanical coupling within the same coordinate plane has decreased from the order of 10⁻⁵ m to ${10^{ - 6}}$ m, and the coupling between the two radial directions caused by the gyroscopic effect has decreased from the order of ${10^{ - 6}}$ m to${10^{ - 19}}$ m, with both mechanical coupling and gyroscopic effect coupling effectively controlled; the standard deviation of the distance from the axis to the reference point during stable levitation has decreased from $6.52 \times {10^{ - 9}}$ m to $6.38 \times {10^{ - 12}}$ m, and the operation fluctuation of the system is smaller after decoupling; when the rotor accelerates and is disturbed by noises, the system response is no longer affected by the natural frequency and always remains stable; the state feedback decoupling is also effective for different control methods.