Performance investigation of multi-tooth flux-switching PM linear motor

Based on finite element (FE) model, the back-EMF, thrust ripple, thrust force and thrust force-current density characteristics of the multi-tooth flux-switching permanent magnet (FSPM) linear motor are analyzed and compared with those of the conventional FSPM linear motor. Optimal parameters of both stator and mover teeth are further discussed focusing on thrust ripple and thrust force. Finally, performance comparisons between two FSPM linear motors with different end shapes are made. It is found that the structure with two-tooth end is more desirable. It shows that the FSPM linear motor with multi-tooth structure can not only decrease half number of permanent magnets, but also output high thrust force at low current density with small thrust ripple.