Study On Decoupling Control Method And System Of Active Magnetic Bearing State Feedback Based On ?-order Inverse System

The rotating machinery is developing towards to the goal of high speed and high precision,convention support type of mechanical bearing limits further improvements of its performance,especially in complex environments,such as extreme temperature,high pressure,and fields like military,aeronautical,life sciences that need high speed and high precision.Magnetic bearing have topic advantages of no wear,no lubrication,long life and controllable support characteristic.In theory,rotor speed is only limited by material strength,and its dynamic characteristics can be regulated.Magnetic bearing is ideal support method for high speed precision rotor.Magnetic bearing rotor system has the characteristics of multivariable,nonlinear and strong coupling.In the running of magnetic bearing rotor system,nonlinear interaction,various coupling effect and parameter variations will lead to changes in system model,and make it difficult to control.In order to improve the robustness and controlling accuracy of magnetic bearing rotor system,the study of its control method is still worth improving.Therefore,this paper studies the control method and system of active magnetic bearing,the main context concludes:(1)Using the structure and electrical parameter of E-type electromagnet,the linearized analysis of electromagnetic force model is given in the paper.We proposed the concept of relative error ratio,and validated the electromagnetic force model has enough effective linearized interval.We analyzed the coupling form and coupling mechanism of magnetic bearing rotor system,and built a five degree free dynamic model of active magnetic bearing rotor system.(2)Choosing the appropriate state variables to establish the state space equation of rotor system.Based on inverse system theory,we got the inverse system of state space equation.The ? order pseudo linear integrating subsystem after decoupling was established though state feedback and input transformation.Using internal model controller to synthesize the subsystem,and built the control system model.(3)Based on Matlab-Simulink,the floating of rotor position control system,antidisturbance perdormance and decoupling performance were verified through simulation.(4)Based on the study of double DSP all digital magnetic bearing control system.We designed and developed software and hardware platform of control system,including digital switch power amplifier and double DSP controller.We realized the discretization of inverse system decoupling control algorithm,and established the communication protocol and data storage mode.(5)Based on magnetic levitation fan,we complete the experiment that corresponded to simulation.The control method in this paper has been proved its validity on many performances,such as rotor floating,anti-disturbance perdormance,rotation and decoupling.The study of this paper is aimed at the control problem of magnetic bearing rotor system,due to the multivariable,nonlinear,strong coupling,magnetic bearing rotor system is hard to control.We established the decoupling control model based on inverse system,proposed the control method of inverse system state feedback decoupling.We solved the imitations of control parameters on conventional control method,which always ignore the model.We developed the software and hardware platform of the control system,which is practical method to improve the performance of magnetic bearing's high speed rotor.