Electric Vehicle Hub Motor Vibration And Suspension Matching

In recent years,the climatic environment has been deteriorating and global temperatures have continued to rise,so the field of BEV(Blade Electric Vehicles)is booming.Compared with traditional fuel vehicles,BEV has many unparalleled advantages,so the market is very broad.At present,BEV can be divided into two main driving forms:centralized motor drive form and hub motor drive form.Among them,the centralized motor drive form retains most traditional fuel vehicles’ structures.The hub motor drive form directly integrates the power,brake and transmission structure into the automobile hub,which greatly simplifies the mechanical structure of the car.Then,it brings the advantages of high transmission efficiency,simple structure and high space utilization.But its structure also brings a lot of car dynamics problems.This structure will deteriorate the vehicle ride comfort,increase vehicle vibration,and deteriorate the suspension filter performance.In view of the above problems,the purpose of this paper is to reduce the vehicle vibration and design the controller to optimize the suspension.The specific work contents are as follows:(1)Established quarter suspension models in the form of a conventional form and hub motor form.Then,the Simulink’s simulation proves that the increase in the unsprung mass of the hub motor form does deteriorate the ride comfort and steering stability of the car.(2)The motor model was established by Maxwell electromagnetic simulation software.The finite element analysis of the radial magnetic field of the motor was used to obtain the radial magnetic field force of the motor under static eccentricity and dynamic eccentricity.Applying the obtained radial magnetic field force to the Simulink model of the hub motor makes the model more realistic.(3)The dynamic vibration absorber is used to optimize the suspension,and a magnetorheological damper is added between the body and the wheel to make it a semi-active suspension.For the control of semi-active suspension,the mature ceiling damping control is first adopted as the comparison standard,and then the fuzzy control method is used to optimize the suspension control.The rules and fitness of fuzzy control are obtained by genetic algorithm.Finally,establish the 11-degree-of-freedom vehicle model,and design experiments to verify the simulation results.