Design And Performance Study Of Hybrid Suspension With Linear Motor For Energy Regeneration

In order to overcome the adverse effects of the unsprung mass of the suspension on the ride comfort and steering stability of the new generation of wheel-driven pure electric vehicles,this paper proposes a feed-type linear motor hybrid.Suspension System.The hybrid suspension has both active vibration damping and energy-feeding functions.It studies the structure and parameters of its key components and its active vibration reduction control theory and method.It can be applied to new application objects and design a reasonable hybrid suspension structure scheme.Provides a new direction for the application of hybrid suspension technology.At the same time,the working characteristics,control methods and functional realization conditions of the hybrid suspension linear motor actuator are studied,which is of great significance to improve the overall performance of the suspension.The research work on hybrid suspension in this paper is as follows:Firstly,the structural configuration of the Tubular Permanent-magnet Linear Synchronous Motor(TPMLSM),the spring,and the small damping damper is proposed.Considering the adverse effects of the increase of the non-sprung mass of the electric wheel on the stability of the vehicle's motion,combined with the suspension dynamics and kinematics research methods,the parameter calculation of the key components,the hard point optimization design of the support structure and the DOE(Design of Experiments)simulation Test,analyze the method of improving vibration damping performance and motion characteristics,and quickly design a reasonable hybrid suspension system.Secondly,the suspension dynamics of the 1/4 hybrid suspension vibration model is studied.The Linear Quadratic Gussian controller is designed to verify that the hybrid suspension can effectively improve the overall damping performance of the suspension.By analyzing the working characteristics of the suspension,the design goals of the motor and the switching strategy of the active damping/feeding mode are determined.The design indexes of the core components of the hybrid suspension are studied.The design and optimization of the body and electromagnetic structure of the 8-pole 9-slot TPMLSM actuator are carried out.The electromagnetic simulation is carried out by the finite element method to verify whether the motor can meet the functional requirements of the actuator.The influencing factors of the linear motor thrust fluctuation are the cogging force and the end force,which are related to the primary axial length and the end tooth height dimension respectively.By optimizing these two parameters,the relationship between the parameter value and the thrust fluctuation is studied.Corresponding relationship,analysis and simulation results propose measures to effectively reduce thrust fluctuations to ensure the performance of the actuator.Finally,the overall simulation of the hybrid suspension system and the analysis of the active vibration reduction and feed energy functions are carried out.Two mathematical methods of thrust control are established to study the two methods of thrust control: FOC(vector control)and DTC(direct torque control)to determine FOC.It has a faster response speed than DTC.Through the simulation experiments of suspension,motor,control method and feed loop,the effectiveness of TPMLSM control method to improve the overall performance of the suspension is verified,and the feed efficiency of the hybrid suspension is evaluated.By studying the feed mechanism of hybrid suspension,the theoretical basis for the realization of the electromagnetic energy design of the actuator and the active vibration reduction function of the hybrid suspension is provided.