Abstract
The ironless permanent magnet linear synchronous motor (IPMLSM) is widely used due to low thrust ripple and fast response. Its disadvantage is low thrust density. The novel double-layer winding IPMLSM (DW-IPMLSM) with quasi-Halbach magnets can improve the thrust density. However, it also makes the winding structure asymmetric. Based on finite element (FE) model, this paper investigates the influence of winding asymmetry on force performance. The results show that the influence of winding asymmetry on thrust ripple is great, while the normal force is slightly affected and it needs to be considered only in precise application. Moreover, compared with traditional single-layer IPMLSMs, the proposed DW-IPMLSM is proved to have higher thrust density and smaller thrust ripple.
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