Influence Of Coupling Torque Of Thrust Plate On Radial Vibration Of Magnetic Levitation Flywheel Rotor

Magnetic levitation flywheel energy storage system is a high speed flywheel rotor system supported by electromagnetic bearings.The vibration characteristics of the rotor are closely related to the support characteristics of the electromagnetic bearing,thus affecting the safety and energy storage efficiency of the system.This paper talks the vertically placed magnetically levitation flywheel energy storage system as the reararch object,and analyzes the vibration characteristics of the rotor and the effect of the coupling torque on the steady-state eddy of the rotor considering the coupling torque exerted by the axial magnetic bearing on the thrust plate.According to the electromagnetic force calculation formula,the electromagnetic force model of the radial ABM is derived,and the equivalent stiffness and damping of ABM are calculated,the influence of control paramteers on the equivalent stiffness and damping of ABM is analyze;The linear dynamic differential equation of magnetic levitation flywheel rotor with unknown coupling torque is established.Determine the structural parameters of the axial electromagnetic bearing according to the dagign principle of the axial ABM,and the coupling torque generated by the thrust disk was derived by the integral method according to the formula of electromagnetic force derivation;Finite element analysis software is used to simulate and verify the electromagnetic force of the axial ABM and the coupling torque applied to the thrust plate;The The coupling torque of the unevenly distributed electromagnetic force on the rotor center is calculated.The rotor dynamic characteristic equation with coupling torque was improved,and the coupling torque expression was simplified according to the influence of displacement parameters on coupling torque;Campbell diagram was drawn to solve the critical speed;Through the numerical analysis method to calculate the considering coupling torque under different rotating speed of rotor vibration amplitude and the rotor core trajectory,compare the classic four degrees of freedom rotor dynamic equation analysis after introducing the coupling torque amplitude,tilt rotor critical speed,the translational changes of the amplitude,the analysis of the effect of coupling torque on the rotor steady-state eddy.The results show that the coupling torque can reduce the second-order critical speed and increase the rotor deflection amplitude.The 600Wh flywheel energy storage test prototype is debugged and the vibration data is collected.the collected experimental data processing analysis 600 wh energy storage flywheel rotor vibration response in the actual operation process,draw the rotor of radial electromagnetic bearing vibration amplitude figure,displacement and frequency domain graph,through the analysis of experimental data to verify the correctness of the theoretical calculation results.