Structural Design Analysis And Controllability Research Of Flywheel Battery Support System

In this paper,flywheel battery energy storage system is a research object,main content with a new type of magnetic suspension support system,based on the proposed new magnetic levitation support system,the selected bearing were studied structural parameters design,magnetic field coupling analysis and controllability study.The main content of the study includes:(1)A new type of magnetic suspension support system for flywheel battery is proposed,that is,radial use of electromagnetic bearing and axial use of topological permanent magnetic bearings,respectively,to support the radial and axial loads of the flywheel rotor.The author compares the magnetic levitation support system with other supporting systems.The results show that the support system has the advantages of low cost of manufacturing,simple design of control system and low power consumption.This paper also uses the basic electromagnet as a model and the basic theory of electromagnetic field to establish a mathematical model of the electromagnetic force of the electromagnet,taking the differential model diagram of the radial electromagnetic bearing control system as an example,the electromagnetic force formula of the radial electromagnetic bearing is obtained.It provides a theoretical basis for the follow-up bearing design analysis,coupling magnetic field analysis and controllability research.(2)The bearings used in the flywheel battery magnetic suspension support system are radial electromagnetic bearings and topological type axial permanent magnetic bearings,the topological type axial permanent magnetic bearing is a combination of permanent magnet and soft magnetic material,according to the structural characteristics and performance of these two types of bearings,and to achieve the effect of stabilizing the flywheel,the selection of materials and the design of structural parameters are performed.According to the parameters obtained in the Ansoft Maxwell modeling and electromagnetic field simulation analysis,and the results of the simulation observation of the magnetic field distribution of the bearing,and the variation of the magnetic force,can obtain the rationality of the designed parameters and the feasibility of the selected magnetic levitation support system.(3)According to the structural parameters of the bearing obtained in the previous,a three-dimensional structure diagram of the magnetic levitation support system is established in Ansoft Maxwell,and analysis with the magnetic coupling.Compare with the obtained simulation results and the simulation results in a single case,found the strength of the magnetic field coupling has very little influence on the electromagnetic force and does not affect the performance of the support system.At the same time,it also verifies the feasibility of this support scheme.(4)According to the mathematical model of radial electromagnetic bearing differential mode,the transfer function of radial magnetic bearing control system using voltage amplifier is derived.Through transfer that function programming,the frequency domain response diagram of control system is obtained.According to the stability judgment rule,the control system is unstable and needs correction.This paper chooses to correct in the SISO control system designer.By adding a pair of conjugate poles to deduce the system transfer function after correction,and then using the frequency domain response diagram of the control system,it is clear that the root locus diagram is stable.Finally,the Simulink control tool in Matlab is used to simulate the corrected control system.From the simulation results,it can be seen that the flywheel shaft can operate stably.In summary,in this paper,the magnetic levitation support system has been used for magnetic field simulation,magnetic field coupling analysis,and control system research.According to the simulation results obtained,the rationality of the structural design of the new magnetic suspension support system and the feasibility of the flywheel support system scheme are verified.Provides a theoretical reference for the future research on the magnetic suspension supporting system of flywheel batteries.