Investigation of auxiliary poles optimal design on reduction of end effect detent force for PMLSM with typical slot-pole combinations

Permanent magnet linear synchronous motor (PMLSM) has been widely used in various kinds of industrial applications due to its outstanding servo performance. However, the detent force is one of the major problems of PMLSM which brings about force ripple and mechanical vibration. The end effect detent force is the inherent defect of linear motors because of the length difference between primary and secondary. For the past few years, several end effect detent force optimization techniques for PMLSM have been proposed [1-2]. As one of the optimization techniques, the auxiliary poles method has good effect on the reduction of the end effect detent force. However, only a certain slot-pole combination of PMLSM is researched by numerical results and the applicability of this method for other slot-pole combinations is not summarized.