Analysis Of Optimization And Motion Characteristic Of Magnetic Suspension Flywheel Rotor System

At present,the research of maglev flywheel energy storage technology is deepening,the rotor’s kinematics is directly related to the safe and stable operation of the system,which has always been the hotspot of flywheel rotor system.This paper,based on the theory and combined with experimental data,focuses on the 600 Wh flywheel rotor system at the working speed of the flywheel rotor movement characteristics,and the critical speed is analyzed,besides the energy storage system is optimized.First of all,based on the movement and supporting characteristics of the flywheel rotor,the system is simplified and the overall dynamics model of the rotor is established.According to the whirling and gyroscopic effects of the flywheel rotor during high-speed operation,the imbalance force and gyroscopic moment suffered by the flywheel rotor are analyzed.According to the working principle of the support system,the electromagnetic force received by the rotor is derived and the stiffness coefficient of the system is obtained.Based on the above force situation,the establishment of dynamic model of flywheel rotor is completed.Based on the dynamic model,the critical speed of the rotor is solved by transfer matrix method.The shaft system is discretized,and the transmission matrix of the shaft system from the unit to the whole is established,and the critical speed of the flywheel rotor is calculated.And with the help of Workbench analysis,verify the rationality of the above theoretical analysis.According to the rotor’s attitude and theoretical data at each critical speed,the running stability of the system is analyzed.After that,based on the rotation test,the experimental data are filtered and the rotor’s movement characteristics are analyzed.The actual critical speed distribution interval of the rotor is obtained by analyzing the waveform changes recorded by the oscilloscope at successive moments,so as to verify the correctness of the theoretical calculation.Based on the theory of stability analysis,the axial loci、time-domain and frequency-domain diagrams of the rotor were simulated by using the experimental data of the rotating system at 5000 rpm and 7000 rpm.A comprehensive analysis of the flywheel rotor at a steady speed of motion get the imbalance in the movement response and outside interference is the main reason for the rotor vibration.Finally,the flywheel rotor is optimized by using Workbench simulation analysis from the perspective of energy storage and movement of the flywheel rotor.Aiming at the phenomenon of small upper and lower bigness in movement,the system layout improvement is proposed,and the comparison of the results under different schemes is made.For the existing scheme,the energy storage does not reach the theoretical design,and the optimization of flywheel structure is proposed.Based on the optimal control theory,the optimization results are satisfied with the objective of reducing the stress and mass of the flywheel and increasing the moment of inertia of the flywheel.Lay the foundation for the follow-up study design.