Development of a High-Thrust Dual-Mover Transverse-Flux Linear Oscillatory Machine With Spoke PMs Embedded on Mover Yoke

Abstract

In directly reciprocating drive systems, linear oscillatory machines (LOMs) have the advantages of compact structure, high reliability, and high efficiency. However, although the Redlich-type LOM (RLOM) has been commercialized, it still has the demerits of low thrust density, large consumption of rare-earth materials, and complex structure. Therefore, this article proposes a novel moving-magnet transverse-flux LOM with spoke permanent magnets (PMs) inserted in dual mover yokes [high-thrust dual-mover transverse-flux LOM (HDTLOM), which has simpler laminated cores and higher thrust than the conventional LOMs. Benefiting from the spoke PMs flux concentration effect, the flux density is enhanced, which is beneficial for enhancing the thrust and reducing the PM consumption. Then, to optimize the electromagnetic performance, the main design parameters are classified by sensitivity analysis based on the finite element analysis (FEA). Consequently, the grid search and orthogonal experimental design (OED) are carried out for the optimal selection of the parameters, including the influence of both the axial and radial sizes on the performance. Afterward, some key indexes of the optimized HDTLOM are compared with the several conventional LOMs to verify its advantages. Finally, the machine is prototyped, of which performance improvement has been validated by the experimental tests.