A novel method to calculate the thrust of linear induction motor based on instantaneous current value  

作　　者：Jiaqing MA Yunpeng ZHU Jing JIANG 

机构地区：[1]Key Laboratory of Magnetic Levitation Technologies and Maglev Trains(Ministry of Education of China),Superconductivity and New Energy R&D Center,Southwest Jiaotong University,Chengdu 610031,China

出　　处：《Journal of Modern Transportation》2012年第2期76-81,共6页现代交通学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 50588201,50672078, and 50872116);the National Basic Research Program (973 program, No. 2007CB616906);the Australian Research Council (Grant No. DP0559872 and DP0881739);the PCSIRT of the Ministry of Education of China (No. IRT0751)

摘　　要：Because of the end effect, a linear induction motor （LIM） runs in an asymmetrical state even though the winding of each phase is symmetric. Based on the basic principle of the LIM, a new approach was proposed to calculate the thrust of the LIM using the instantaneous current value. A three-phase LIM model with 12 slots and a singlelayer winding was designed to validate this method. The experiments show that when the current is small, the calculated results basically agree with the experiments. The agreement becomes worse with the increase of the current because of the saturation of the primary iron core. The proposed formula is suitable when the iron core of the LIM primary is in an unsaturated state.Because of the end effect, a linear induction motor （LIM） runs in an asymmetrical state even though the winding of each phase is symmetric. Based on the basic principle of the LIM, a new approach was proposed to calculate the thrust of the LIM using the instantaneous current value. A three-phase LIM model with 12 slots and a singlelayer winding was designed to validate this method. The experiments show that when the current is small, the calculated results basically agree with the experiments. The agreement becomes worse with the increase of the current because of the saturation of the primary iron core. The proposed formula is suitable when the iron core of the LIM primary is in an unsaturated state.

关 键 词：linear induction motor （LIM） asymmetrical state instantaneous current value 

分 类 号：TM346[电气工程—电机] TP334.2[自动化与计算机技术—计算机系统结构]