In order to realize the self-sensing function of the magnetic fluid bearing,a PID closed-loop feedback control system was designed,so that the magnetic fluid bearing could automatically adjust the damping under different working conditions,so as to achieve the optimal damping effect.In order to verify the rationality of the closed-loop control system,a simulation model of the magnetic fluid bearing closed-loop control system was built by using MATLAB/Simulink.The same excitation signal was applied in the simulation model,and the data obtained by applying PID control and not applying control were compared and analyzed.The simulation results show that under the PID control,the magnetic fluid bearing can effectively reduce the amplitude of the shaft and the vibration of the bearing,and the suppression effect is obvious,especially at the peak of the amplitude.The feasibility and effectiveness of the self-sensing bearing control system are proved,which provides a theoretical basis for the follow-up research of self-sensing magnetic fluid bearings.