摘  要：直线电动机的气隙磁场是决定其性能的关键因素。针对平板动磁式永磁直线同步电动机（PMLSM），采用Halbach磁体阵列来提高气隙磁场的正弦性。给出了Halbach阵列磁体排列方式及磁化规律；利用有限元法对Halbach磁体结构与常规磁体结构的永磁直线同步电动机进行比较，分析了磁通密度在平均气隙及轭部的分布情况；在此基础上提出了一种基于Halbach阵列的改进的磁体排列方案，并分析了此方案对电机气隙磁密的影响，得出了一些有用的结论。
关键词：直线电动机；永磁同步电动机；Halbach阵列；气隙磁场

Abstract: Air-gap magnetic field was the key factor to determine the performance of permanent magnet linear synchronous motor(PMLSM).This paper adopted Halbach magnet array to raise the sinusoidal air-gap magnetic field,and gave the magnetization law.PMLSM with Halbach magnet array and conventional magnet structures were compared with FEM software to analyze the magnetic density in the air-gap and yoke.Finally,an improved program based on Halbach array was proposed.
Key Words: Linear motor;PMLSM；Halbach array；Air-gap magnetic field