Design principle of a 16‐pole 18‐slot two‐sectional modular permanent magnet linear synchronous motor with optimisation of its end tooth

Abstract

In order to improve the performance of the linear motor system, it is necessary to adopt a simple motor structure and effective optimisation method to reduce the detent force without decreasing the average thrust. A 16-pole 18-slot two-sectional modular permanent magnet linear synchronous motor (PMLSM) is investigated in this study, in which the primary core is divided into two modules and coupled with the secondary, forming two sections. It is found that the modular distance between the two sections affects the detent force and back-electromotive force of the whole motor. Thus, the characteristics of the detent force and the categories of the winding arrangements are analysed. The modular distance of 4 τ /9 is chosen after analysis and comparison. To further suppress the detent force and improve the average thrust, a new end tooth structure including different wide and narrow tooth is proposed, which is set at the ends of each section's primary core. The design method of the end tooth parameters is obtained by theoretical derivation and the optimisation efficiency of end tooth parameters is further improved by layered optimisation design. Finally, the experiments on the 16-pole 18-slot PMLSM validate the correctness and feasibility of the proposed modular motor structure.