Analysis Of Bearing Characteristics Of Electromagnetic Bearings And Optimization Of Performance Design

The electromagnetic bearing is a new type of high-performance bearing that uses the controllable electromagnetic force to suspend the bearing rotor in a certain position.It combines a variety of subject knowledge such as electromagnetism,mechanics,and control engineering,and is a complex electromechanical hybrid system.Compared with other bearings,electroma--gnetic bearings have the advantages of no friction,high speed and high precision.Therefore,they have good application prospects in many fields.Support characteristics are important performance indicators of electromagnetic bearings,which affect the suspension stability,dynamic performance and rotation accuracy of the system rotor.The research on the bearing characteristics of the electromagnetic bearing can provide an effective basis for the design of the system controller and the optimization of the control performance.This paper mainly studies the design and control performance optimization of the electromagnetic bearing control system based on the bearing characteristics of the electromagnetic bearing.The main research contents of this paper are described as follows: Firstly,the bearing characteristics of electromagnetic bearings are derived based on the mathematical model of electromagnetic bearings.The relationship between the electromagnetic bearing controller and the support characteristics of the system is analyzed theoretically.The relationship between the bearing characteristics of the electromagnetic bearing and the system time lag is studied.Second,because electromagnetic bearings have intrinsic instability,a suitable controller is needed to stabilize the system.Therefore,the software and hardware design of the DSP-based electroma--gnetic bearing controller is completed,and the code generation of the DSP based on Simulink is studied.At the same time,a semi-physical simulation platform based on Dspace is built.The seamless connection between Simulink and Dspace platform facilitates the design and real-time debugging of control algorithms.Finally,the adjustment method of the support characteristics of the traditional electromagnetic bearing can not be well balanced with the shortcomings of the relationship between the high performance and stability of the electromagnetic bearing system.A numerical analysis method for the optimal adjustment of the bearing characteristics of the electromagnetic bearing is proposed.The relationship between the regulation of support characteristics and system stability was quantitatively studied,and the system time lag wasstudied.The experimental results show that the support performance of the system has been improved by the adjustment of the method.The main contributions of this article are:(1)The bearing characteristics of electromagnetic bearings are analyzed systematically.Combined with the requirements of system stability and stability margin,a numerical analysis method for optimal adjustment of the bearing characteristics of electromagnetic bearings is proposed.(2)The influence of time lag on system stability and stability margin is studied.When the support characteristics are adjusted,the attention to system time lag is kept at all times,and the practicality of regulation is improved.(3)The design of the DSP digital device of the electromagnetic bearing is completed,which is mainly divided into the hardware PCB manufacturing and the software control system design,and finally realizes the stable suspension of the electromagnetic bearing.At the same time,Dspace's semi-physical simulation platform was built to improve the design efficiency of the control algorithm.