| Linear motor has a long history and the drive system which is formed by linear motor as the core equipment has been widely used in modern industries.Switched reluctance linear motor(SRLM)has a bright prospect with advantages of simple structure,low cost,high reliability and strong fault-tolerant ability.However,SRLM still has the disadvantages of low output and large pulsation,which restricts its further development.Therefore,the research on design and optimization of SRLM is of great significance to the performance improvement and application of SRLM.Firstly,the structure features of a new tubular switched reluctance linear motor(TSRLM)with transverse flux are introduced.The initial structure dimensions of TSRLM are determined by referring to the design empirical formula of TSRLM.The three-dimensional finite element model of TSRLM is established by Flux finite element software,and the static flux linkage and static electromagnetic force of TSRLM are obtained.The electromagnetic field distribution and magnetic flux density characteristics of TSRLM are analyzed,which lay a foundation for the optimization research of TSRLM.Secondly,the average static electromagnetic force,the electromagnetic force smoothing coefficient and the electromagnetic force density are determined as the three optimization objectives of TSRLM.The single objective optimization of TSRLM control parameters based on single parameter sensitivity analysis method is realized with electromagnetic force smoothing coefficient as an objective.The sensitivity of TSRLM optimization objective to the structure parameters is qualitatively analyzed,and the objective function of TSRLM comprehensive performance is established.Combining with the subjective and objective factors,the weight of the three optimization objectives of TSRLM in the comprehensive performance is obtained by the analytic hierarchy process.The sensitivity of TSRLM comprehensive performance to structure parameters is quantitatively analyzed and the structure parameters to be optimized are determined by combining with qualitative analysis.According to the value of objective function,the multi-objective optimization of TSRLM structure parameters based on single parameter sensitivity analysis method is realized.The effectiveness of this method is verified by comparing the TSRLM performance before and after optimization.Thirdly,in order to improve the shortcomings of single parameter sensitivity analysis method,a multi-objective optimization algorithm for TSRLM structure parameters based on orthogonal test matrix analysis is proposed.The weight of the influence of each level value of the structure parameters to be optimized on the optimization objective and comprehensive performance of TSRLM is obtained,and the multi-objective optimization of TSRLM structure parameters based on orthogonal test matrix analysis method is realized.The TSRLM performance after multi-objective optimization by orthogonal test matrix analysis method is compared with the TSRLM performance before optimization and the TSRLM performance after multi-objective optimization by single parameter sensitivity analysis method respectively,the superiority of the orthogonal test matrix analysis method is verified,the final optimization scheme and dimensions of TSRLM are determined.Finally,a TSRLM prototype is made,and the hardware control platform of TSRLM is built.The static flux of TSRLM in different mover positions and the static electromagnetic force of TSRLM in half a motion cycle are measured.The static experiment results are compared with simulation results,which verifies the static model and static performance of TSRLM.In addition,the current waveform of TSRLM in different turn-on and turn-off positions under the power drive state,as well as the current waveform and voltage waveform under the power generation state are measured.The dynamic experiment results are compared with the simulation results,which verifies the dynamic model and dynamic performance of TSRLM. |
