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.