Research On Vibration Characteristics And Suppression Of Magnetic Suspension Rotor Of Vehicle Flywheel Battery

As a new type of battery,the flywheel battery adopts physical energy storage,and has the characteristics of high specific energy,large discharge current,high energy conversion rate,low pollution and long cycle life.It has broad development prospects in the field of new energy vehicles.However,the driving conditions and road conditions of the vehicle are complicated,which causes the flywheel battery magnetic suspension rotor to withstand more diverse and complex excitations during the movement.These excitations seriously threaten the safety of the flywheel battery system and reduce the energy storage of the flywheel battery.Based on this paper,the research on the vibration of the magnetic suspension rotor in the vehicle flywheel battery during the running of the vehicle is carried out.The main research contents and results of this paper are as follows.Based on the idea of suspension engine,the stator of the flywheel battery was suspended.The mechanical model of the 15 degrees of freedom of the vehicle flywheel battery was established by the integral method and the isolation method.The differential method was established by using the energy method and the Lagrange equation according to the established mechanical model.Based on the PD control,the magnetic bearing mechanical model and the excitation force of the magnetic suspension rotor were derived.At the same time,the vehicle acceleration the driving condition and the continuous deceleration belt model coupled with the vehicle speed and the vehicle climbing model were established.The two kinds of driving conditions of constant speed and acceleration of the vehicle were studied respectively.Through the two kinds of road conditions of continuous deceleration belt and slope,the influences of vehicle driving speed,deceleration belt height and slope on the motion form and response amplitude of the magnetic levitation rotor are analyzed.The time domain signal was analyzed by fast Fourier transform to analyze the power spectral density characteristics of the magnetic levitation rotor.At the same time,the stable speed range of the magnetic levitation rotor under different working conditions was analyzed from the nonlinear angle.Aiming at the problems of large amplitude response and small stable speed range of the magnetic levitation rotor,a hybrid control strategy was proposed to control the magnetorheological damping of the suspension.The fourth-order Runge-Kutta method was used to solve the system and mix the MATLAB simulation software.The control effectively reduces the influence of the vehicle suspension vibration on the stator motion attitude of the flywheel battery,thereby effectively reducing the excitation force of the magnetic suspension rotor.At the same time,based on the PD control,the feedback link was added to realize the cross-feedback control of the electromagnetic bearing.The simulation finds that the amplitude of the magnetic suspension rotor after loading the cross-feedback control is reduced,the stable speed range was increased,and the peak power spectral density is also reduced.The C-level pavement was constructed,and the vibration response of the maglev rotor at the upper and lower bearings after the load mixing control and cross feedback control were analyzed.