Co-simulation Research On Linear Motor Of Maglev Train Based On Simplorer Field-circuit Coupled Multi-physics Domain

In order to simulate the actual situation of the motor,make up for Matlab’s focus on the motor control while ignoring the nonlinear characteristics of the motor itself and the problem that the ANSYS Maxwell software electromagnetic simulation process cannot be added to the complex control system,so as to propose the Simplorer environment.The complex control circuit and the motor finite element model built by Maxwell software are combined to realize the coupling of the circuit and the magnetic field,and the idea of joint simulation in multiple physical fields is proposed.At the same time,it can solve the problem of complex calculation of normal force.The motor used in the paper is a single-sided linear induction motor(SLIM),which is the motor of the maglev train traction system.The control part will use the more common control methods: vector control and constant current constant slip.The performance of the motor will be analyzed from various aspects.This paper is divided into the following sections:The first part introduces the related principles of the traction system of the maglev train,reviews the development history of the linear induction motor and the evolution history of the motor drive technology and introduces the influence of the side effect of the motor.At the same time,Maxwell software is used to analyze the influence of motor variable structure parameters on motor operation.The second part introduces the basic theory of vector control and constant current constant slip frequency control technology.In the third part,joint simulation is carried out,and the control method adopts vector control technology.Using Matlab and Simplorer to build motor vector control circuit and Maxwell software to build a linear induction motor finite element module to achieve fieldcircuit coupling joint simulation,through the analysis of the motor’s magnetic field distribution,velocity waveform,current waveform,thrust waveform and normal force waveform,A more transparent understanding of how the motor works.In the fourth part,co-simulation is carried out by applying constant current constant slip frequency control technology.Throughout the co-simulation process,given the slip frequency and stator current,a constant thrust and normal force is obtained,which is the constant current constant slip control.In order to obtain the optimal running effect of the motor and change the slip frequency of the motor,six slip frequencies are mainly set,which are 5 Hz,8 Hz,10 Hz,13 Hz,and 16 Hz.When comparing the slip frequency operation,analyze the output characteristics of the motor to obtain the slip frequency that can make the linear induction motor run optimally.For the case of changing the stator current operation,problems such as a large workload and a long simulation time are not considered here.Finally,the results of the two control simulations are summarized,and a comprehensive comparison is made to obtain the advantages and defects of each control technology,which provides a reliable reference for the application of linear induction motors in various fields.