Calculation of Electromagnetic Performance for Long Primary Double Sided Linear Induction Motors Considering Backward Traveling Wave
Zhang Qian1, Liu Huijuan1, Ma Jiefang1, Li Yuman2
1. School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China; 2. Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing 100094 China
Abstract One dimensional electromagnetic theory is applied to establish the analytical model of long primary double sided linear induction machine (DLIM) with secondary as moving reference frame. Firstly, the expression of the air-gap flux density in the real domain is derived by numerical method. The temporal-spatial distribution characteristics of the forward and backward traveling waves caused by the end effect and the influence of these two traveling waves on the normal component of the air-gap flux density are analyzed. And then the expressions of thrust force density and thrust which considering the forward and backward traveling waves are deduced, and the longitudinal distribution characteristics of thrust density on the secondary are investigated. The characteristics of each thrust component with velocity and the effect of end effect on the fundamental thrust are studied. Finally, the air-gap magnetic field distribution and thrust characteristics of the DLIM at different frequencies are calculated based on the FEM model, and the results are compared with those of the analytical method. The accuracy of the analytical method is verified, which contributes to the initial design and subsequent optimization of long primary DLIMs.
Zhang Qian,Liu Huijuan,Ma Jiefang等. Calculation of Electromagnetic Performance for Long Primary Double Sided Linear Induction Motors Considering Backward Traveling Wave[J]. Transactions of China Electrotechnical Society, 2020, 35(7): 1398-1409.
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2020, Vol. 35 
