Optimization of Secondary Segmented Flux-Switching Linear Motor Designed for Urban Rail Transit

A Flux-switching Linear Motor (FSLM) is suitable for urban rail transit due to its high efficiency and low cost. This paper studies a new FSLM with segmented secondary and the key of this structure is that the secondary stator is composed of separate iron blocks. The topology is introduced, and the operating principle is explained. To ensure that the new FSLM is suitable for the linear traction system, the LIM used in Guangzhou Metro Line 4 is taken as the reference. The electromagnetic characteristics of the new FSLM are studied and compared by means of finite element analysis (FEA). The results reveal that the new FSLM can meet requirements of the linear traction system after multi-objective optimization.