Design And Simulation Of Permanent Magnet Synchronous Motor Controller For Four-wheel Drive Electric Vehicle

With the energy crisis and environmental pollution,traditional fuel vehicles are gradually being replaced by new energy vehicles.Electric vehicles have gradually become a research hotspot in this century because of their advantages such as no pollution and low noise.The four-wheel independently driven electric car has received widespread attention due to its powerful independent control and excellent steering performance.The four-wheel motor synchronization technology is the hot issue in this research field.This article takes the four-wheel motor of electric vehicles as the research object,compares the advantages and disadvantages of the currently available drive motors,and determines using PMSM as the wheel motors.Firstly,make decoupling transformation of PMSM Mathematical model in three-phase static coordinate system.Establish the simulation model of DTC for single motor under certain assumptions,which lays a foundation for the study of the speed synchronization of four motors.Based on the single-motor DTC model,introduce several control schemes for electrical synchronization,and select deviation coupling control as the basic structure of synchronous control.The virtual axis optimizes it and builds a simulation model,performs the simulation of the synchronous control system using the deviation coupling control of the virtual axis,and studies the synchronous operation of the four wheels in straight travel.Although the traditional PID controller has a simple structure and high robustness and reliability,it is obviously unable to meet the requirements for a four-wheel motor to control such a complex time-varying nonlinear system.Based on the traditional PID controller,this paper optimizes the adjustment parameters of the speed compensator through fuzzy PID,adjusts the PID parameters by using fuzzy rules summarized in the experiment,and performs simulation to verify the motor synchronization after the fuzzy PID controller Control effect.In addition to the motor synchronization requirements when driving straight,electric vehicles need to use a differential speed controller to assign speeds in complex road conditions or when turning.Based on the above actual needs,the electronic differential control strategy of the slip synchronization control system is added.and several commonly used car steering models are analyzed.Based on the Ackermann-Jeantand steering model,the wheel tangential speed and front wheel steering speed are calculated respectively Thefunctional relationship between steering angle and vehicle speed,combined with the previous speed synchronous control system,is simulated and verified.This paper has 65 pictures,5 tables,62 related references...