Vibration Signal Analysis And Active Suppression Of Magnetic Suspended Rotor

Active magnetic bearings(AMB)is a new mechtronical bearing which regulating the electromagnetic force to support freely the rotor.It has the advantage which the conventional bearings don't has such as: no contact,no wear,no need for lubrication,high control precision,fast speed,controllable bearing characteristics.So it has a broad application prospect in high speed rotating machinery and precision processing industries.The electrical control system of magnetic bearings(including sensors,controller and power amplifier)affects the stability of the electromagnetic bearing system.At the same time,the control current can be changed by a certain control law,which can generate the controllable electromagnetic force,and the unbalance vibration of the rotor can be controlled actively.This paper will mainly focus on the active control of the bearing characteristics of the magnetic bearing and the suspension of the rotor of the magnetic levitation flywheel and the control of its unbalance vibration.Firstly,this paper introduces the structure and principle of electromagnetic bearing,describes the current domestic and foreign research and development.At the same time,the causes of the vibration of the magnetic suspension rotor are described in detail,and the research status of the unbalanced vibration control is introduced.Secondly,based on the active magnetic bearing system,which used PID(proportion-integration-differentiation)control,the theoretical expression's parameter form of the active magnetic bearing supporting characteristics is given,the effect that control parameters and control delay on the magnetic bearing characteristics are analyzed in an all-round way,through targeted experiments,the controllability and control relationship of the magnetic bearing characteristics are realized quantitative analysis.Then,designed a multi degree of freedom magnetic levitation flywheel rotor experimental platform,including the construction of Matlab/Simulink based hardwarein the loop simulation environment and design of peripheral hardware parts.Further more,the system design principle and the debugging process of various parameters are described in detail,the stable suspension of the rotor is realized.Finally,this paper presents an electromagnetic bearing unbalance compensation control method under variable speed conditions based on recursive search by unbalance of rotor position,generating the control signal and the unbalance vibration control experiment is carried out on the multi degree of freedom magnetic levitation flywheel rotor experimental platform,and the vibration signal of flywheel rotor is analyzed,it is effectively restrained the unbalance vibration of rotor.