Research On Control Mode Of Marshalling Linear Switched Reluctance Motor

Exploring how to alleviate urban traffic congestion has always been a major problem that the country is committed to solving,and the focus is on the development of urban public transport.In recent years,with the introduction of the suspension train,and with its advantages of less occupation of resources,low cost and high safety performance,domestic attention has been significantly improved.However,the current suspension trains generally use rubber wheels as running wheels and rotating motors as the driving core.During long-term operation,the rubber wheels will cause the train to run bumpy due to severe wear and increase maintenance costs.Therefore,it is necessary to propose weight reduction measures to reduce the pressure of the vehicle weight on the rubber wheels,and to reduce the weight without sacrificing the driving performance of the suspended train.This paper takes the lead in exploring a three-in-one suspension train,which uses a marshalled linear switched reluctance motor(MLSRM)as the driving core,which can provide driving force,weight reduction and guiding force at the same time,and the linear motor is used to provide the driving force.The intermediate link between rotation and straight line is omitted,and there is no need to rely on the adhesion of rubber wheels to the track,which can meet the driving requirements of suspended trains while reducing weight.Aiming at the marshalled linear switched reluctance motor used in suspended trains,this paper studies the control method to meet the requirements of stable running of suspended trains and anti-smashing of rails.Firstly,the overall system of suspended train based on MLSRM is expounded,which mainly includes suspended train,MLSRM and motor control system,and then the working principle of MLSRM is introduced from the basic structure and working principle of the existing linear switched reluctance motor;The mathematical model of the motor structure in this paper is built,and its working characteristics are analyzed based on the linear model of MLSRM.On this basis,the basic control model of MLSRM based on nonlinear model is established,and its effectiveness is verified by simulation under the current chopping(CCC)control mode.The direct thrust control(DFC)model based on PID is built based on MLSRM ontology model.The simulation results show that the DFC is difficult to be applied to suspension train due to the problems of thrust drop and normal force greater than the vehicle weight during commutation.On this basis,direct thrust control based on PWM(PWM-DFC)and direct thrust and normal force control based on cosine thrust distribution function(FDF-DFC)are improved respectively.Simulation comparison shows that FDF-DFC can effectively reduce the thrust fluctuation during commutation and limit the normal force.It can meet the needs of suspension train,such as smoothness and anti-collision.Finally,the direct thrust and normal force control based on the cosine thrust distribution function of the PID speed controller is used.The simulation shows that there are problems of poor anti load interference performance and weak dynamic adjustment ability when the load is abruptly changed.Therefore,the sliding mode control algorithm based on exponentially convergent load observer is considered to be applied to the speed controller.The simulation results show that the algorithm can increase the anti load interference ability of the system,help to realize the accurate control of thrust and normal force,and thus suppress the torque fluctuation.Finally,a proportional model prototype of a three-in-one suspension train is built,the reliability of the finite element data is tested under static conditions,and the effectiveness of the above algorithm is verified by dynamic experiments.