Design And Optimization Of Marshalled Linear Switched Reluctance Motors For Suspended Trains

The suspended train effectively utilizes traffic space in the air,and can add a traffic level without changing the urban architectural planning,which is a beneficial supplement to the urban rail transit.The running wheels and guide wheels of the existing standard suspended trains are solid rubber wheels,both of which have the problems of wear and load-bearing deformation.In response to this problem,our research group took the lead in studying the LEET(L-linear motion,E-electromagnetic weight loss,E-electromagnetic guiding,Tsuspended train)suspension train,which integrates linear drive,electromagnetic weight reduction and electromagnetic guidance functions.The linear drive does not depend on the adhesion between the wheels and rails,which enables the adoption of electromagnetic weight reduction to reduce the weight and wear of the rubber wheels.At the same time,the electromagnetic guidance can lower the pressure of the centrifugal force of the train turning on the guide wheels to a certain extent.Based on this background,the aim of this paper is to design a drive motor that satisfies traction force,electromagnetic gravity reduction and electromagnetic guiding force at the same time,and study its design method,optimization method and prototype experimental method.Firstly,a three-in-one motor structure was designed based on LSRM by deriving the three-dimensional electromagnetic force formula of the linear switched reluctance motor(LSRM)and analyzing the relationship between the electromagnetic force and the magnetic pole size,and present the motor structure-Grouped Linear Switched Reluctance Motor(MLSRM)that is further researched in this thesis.Then,according to the national standard GB/T 5599-2019,difference between the LEET system suspension train using MLSRM and the existing system suspension train in terms of the stability index was discussed,and the influence on the mechanical properties of the running wheel and guide wheel tires of the MLSRM electromagnetic force are further studied.,and the running resistance under different working conditions is analyzed.Secondly,the electromagnetic design and optimization methods of MLSRM are studied.a distributed LSRM that meets the requirements of traction and electromagnetic gravity reduction was firstly designed,and divide the magnetic poles along the direction of the guiding force to obtain the ideal guiding force according to the design idea of the three-in-one LSRM.And according to reference data of a domestic suspension train,the MLSRM electromagnetic design example was completed,and a three-dimensional finite element model was built to performance verify and analyse.In order to improve the power density of the MLSRM and obtain greater traction and weight reduction with a smaller primary volume,we conduct a multi-objective optimization design of the MLSRM based on the kriging algorithm,and establish a Matlab-Maxwell co-simulation model to achieve the online calculation of performance of the motor.,and satisfactory optimization results are obtained by adjusting the weight coefficients in the objective function.Finally,an experimental platform for the scale-down of LEET-type suspended trains is established.The MLSRM prototype was designed according to the parameters such as the size of the box beam of the model car and the estimated load of the frame unit.The inductance characteristics and electromagnetic force characteristics of the prototype were measured and analyzed,which proved the effectiveness of the motor design and experimental method.