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Detent force reduction of permanent magnet linear synchronous motor by imposing auxiliary poles technique

This paper proposes a novel technique to reduce the detent force in permanent magnet linear synchronous motor (PMLSM) using auxiliary poles technique. The detent force that is caused by the attraction between permanent magnet (PM) and the iron core without input current can be divided into two components: the slot effect and the end effect. To reduce these two effects, we analyze the characteristics of detent force in relation to the semi-closed slot clearance length and auxiliary poles position by using the two-dimensional (2-D) finite element method (FEM). Finally, the numerical calculations and the experimental results prove that this proposed technique has a good effect on the reduction of the detent force.