The Identification Method Research Of Magnetic Bearing Parameters

Magnetic bearing support characteristics influence the stability and response of system.Researchof magnetic bearing support parameters provides the basis for the design and optimization of thesystem.The purpose of this paper is to study the magnetic bearing supporting parameters by testmethod.In this paper,Magnetic bearing support characteristics research is based on linearsystem.Electromagnetic force is rotor supporting force. The finite element method is used to study therelationship between the electromagnetic force,displacement and control current, including linearregion of the electromagnetic force and the electromagnetic force coupling.and Research shows thatthe linear system assumption is reasonable. and This research provides the basis for magnetic bearingsupporting parameters identification.Magnetic bearing equivalent stiffness and damping research is based on the frequencycharacteristics of the magnetic bearing control system.Radial magnetic bearing supportingcharacteristics are studied by theoretical analysis and simulation. Aiming at the shortcomings of thetheory analysis,This paper put forward a method of system frequency characteristic test. Magneticbearing supporting parameters under static levitation are identified by test method.Accurate rotor support model is the basis of supporting parameters identification.Magneticbearing rotor support model is established by finite element method and transfer matrix method.Dynamic response of two bearing rotor model are analyzed by Patran-nastran and Matlab. Aiming atthe shortcomings of the rotor finite element model,rotor model is updated based on the responsesurface method.This paper studies the magnetic bearing supporting parameters identification based on responsesurface updating method,including the basic principle of supporting parameter identificationmethod.Finite element simulation verify the validity of this method.According to the unbalanceresponse,Magnetic bearing supporting stiffness and damping under rotor running condition areidentified based on the test data. The accuracy of the identified results is verified.Research shows thatmagnetic bearing parameters identification based on the response surface updating method caneffectively identify the magnetic bearing supporting parameters.