基于复合磁性槽楔的PMLSM推力波动抑制

永磁直线同步电机(permanent magnet linear synchronous motor,PMLSM)存在齿槽力,影响电机的控制性能。 本文提出一 种基于软磁、硬磁材料混搭的新型复合磁性槽楔结构(composite magnetic slot wedge,CMSW),能有效抑制 PMLSM 推力波动。 首 先,分析了单一磁性槽楔的材料、尺寸和空间位置分布对 PMLSM 输出推力和推力波动的变化规律。 然后,研究新型复合磁性 槽楔的软磁、硬磁材料配比和位置分布,对电机输出推力、推力波动和齿槽力等电磁性能的影响。 以最大推力和推力波动最小 为优化目标,利用正交优化法对复合磁性槽楔的尺寸进行优化。 研究表明,采用新型复合磁性槽楔可有效降低推力波动和损 耗,推力波动降低 79. 4%,而平均推力基本不变,为 PMLSM 推力波动抑制提供新的技术途径。

Thrust ripple suppression of PMLSM based on composite magnetic slot wedge

The cogging force of permanent magnet linear synchronous motor (PMLSM) affects the control performance of the motor. In this paper, a novel composite magnetic slot wedge ( CMSW) based on soft magnetic and hard magnetic materials is proposed to effectively suppress the thrust fluctuation of PMLSM. Firstly, the influence of material, size and spatial position distribution of magnetic slot wedge on the output thrust and thrust fluctuation of PMLSM is analyzed. the effects of the material proportion and position distribution of soft and hard magnetic materials on the electromagnetic properties of output thrust, thrust fluctuation and cogging force are studied. Taking maximum thrust and minimum thrust fluctuation as optimization objective, the size of composite magnetic slot wedge was optimized by orthogonal optimization method. It is shown that the new composite magnetic slot wedge can effectively reduce loss and thrust fluctuations by 79. 4%, while the average thrust is basically unchanged, which provides a new technology way for thrust ripple suppression of PMLSM.