混合磁悬浮织针驱动的永磁织针磁场分布规律

Study on magnetic field distribution in permanent magnetic needle drive using hybrid magnetic suspension needle

为研究横机织针混合磁悬浮驱动的空间磁场分布规律,通过构建圆柱形和长方体形2种永磁织针结构,根据安培环路定理,将永磁体等效为纵向的多圈电流环结构,并据此推导出织针垂直向上运动至空间任意位置的磁感应强度。在此基础上利用有限元电磁仿真软件对永磁织针模型进行仿真,同时搭建织针空间磁场强度实验测量平台进行数值测量。通过对比计算、仿真和实验测量发现:在圆柱型永磁织针中,厚径比越大,磁感应强度越大;在长方形永磁织针中,厚度不变磁感应强度随着长宽比增大而减小。

In order to study the spatial magnetic field distribution with mixed magnetic suspension for driving flat-bed knitting needles,two permanent magnet needles in cylindrical and rectangular shapes were constructed.According to the ampere loop theorem that permanent magnets are equivalent to vertical coil current loop structure,knitting needle was deduced based on the vertical movement to the space location of the magnetic induction intensity.On the basis of the above,finite element electromagnetic simulation was carried out to simulate the model of permanent magnet knitting needles,and an experimental measuring platform for the spatial magnetic field strength of knitting needles was built for numerical measurement.Through the comparison of model,simulation and experimental measurement results,it is shown that in cylindrical permanent magnetic knitting needles,the larger the thickness-diameter ratio is,the greater the magnetic induction intensity becomes.In rectangular permanent magnetic knitting needles,the magnetic induction intensity with constant thickness decreases as the aspect ratio increases.