| Firstly, the development of linear motor and the process of evolution fromrotating motor to cylinder linear motor are introduced. The working principle andbasic physical equations of switched reluctance linear motor are described. A finiteelement model of single phase switched reluctance linear motor is built by finiteelement software Flux, through which the changing curve of maximum thrust andaverage thrust versus mover cylinder thickness, mover tooth length, mover innerdiameter, stator yoke thickness and air gap thickness can be obtained, and thestructure parameters of the motor are also analyzed. The influences of the motorstructure parameters on the electromagnetic force are summarized and the effects ofthe anisotropic material on the motor thrust are described. The simulated resultsillustrate that it is quite necessary to set isotropic material as one of the assumptions.Then nonlinear simulation model of switched reluctance linear motor control systemis achieved by Matlab/Simulink simulation software. The flux linkage and magneticdata calculated by finite element software are imported into look up table to calculatethe current and magnetic force. The simulated results and experimental results arecoincided, which indicates that simulation model is reliable and the design methodproposed in this paper is correct and effective. A modified motor is depicted on thebasis of the motor structure designed in this paper. Non magnetic ring is utilized inthe motor, which splits the magnetic circuit into two parts. The average thrusts of unitvolume and unit weight are increased significantly after improving the motor structure.The summary of the total work and the expectation of further research are given at theend of paper. |
