Analysis and optimization of permanent magnet linear synchronous motor characteristic with composite magnetic slot wedge

Abstract

To suppress cogging force and thrust ripple, a novel composite magnetic slot wedge composed of hard and soft magnetic materials is proposed. A finite element model of a fractional-slot permanent magnet linear synchronous motor is established. First, the effects of non-magnetic, hard magnetic, and soft magnetic slot wedges on electromagnetic characteristics – specifically cogging force and thrust ripple – are compared and analyzed. Subsequently, the composite magnetic slot wedge structure is optimized to determine the ideal material proportion. Finally, the performance of the proposed composite magnetic slot wedge is compared with existing composite slot wedges made of magnetic and non-magnetic materials. The results indicate that the proposed composite magnetic slot wedge provides superior comprehensive optimization of motor performance.