Analysis and computer-aided simulation of cogging force characteristic of a linear electromagnetic launcher with tubular transverse flux machine

This paper investigates a linear electromagnetic launcher with tubular transverse flux permanent-magnet linear machine (TFPMLM). Special focus is given on its cogging force characteristic, including the theoretical analysis and computer-aided simulation. Both 3-D and equivalent 2-D finite-element analyses are performed to calculate the cogging force, and the results are compared. It is shown that the proposed 3-D to 2-D equivalence can predict the cogging force of the tubular TFPMLM in an accurate and fast way.