Flux Analysis and Thrust Density Enhancement of Double-side Yokeless Multi-tooth PM Linear Motor with Dual PM Configuration for Long Stroke Application

Double-sided yokeless multi-tooth permanent magnet linear motor (DSYMPMLM) is a promising candidate for extended-stroke applications, owing to its yokeless topology, magnet-free secondary track, and balanced normal force. In order to improve thrust density while minimizing thrust ripple, this paper proposes a new PE-RLM design featuring a double-sided yokeless multi-tooth structure and a dual slot-in PM configuration, which overcomes the negative effects of harmonic interactions and detent force. Meanwhile, the harmonic interactions enhance the thrust force with a 12/38 slot–pole combination. Furthermore, the effectiveness of the proposed design is verified through magnetic flux analysis and finite element method (FEM) simulations. © 2026 IEEE.