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为了解释控制棒可动线圈电磁驱动机构加入永磁后电磁力增强的机理,对机构的电磁机理及分布进行了研究。利用Maxwell张量法及有限元分析技术,计算了加装永磁前后衔铁表面的电磁力的分布,分析了加装永磁前后磁密矢量和主气隙的磁通变化规律,并与传统螺管电磁铁进行了比较。分析得出,上永磁使磁密矢量方向向主气隙方向偏转,下永磁使衔铁内的磁通量增加,两者均增加了主气隙的磁通量,这是电磁力提高的主要原因。
In order to explain the mechanism of the enhancement of the electromagnetic force of the movable coil electromagnetism drive mechanism after adding permanent magnets, the electromagnetic mechanism and distribution of the mechanism are studied. Using Maxwell tensor method and finite element analysis technology, the distribution of electromagnetic force on the surface of the armature before and after the installation of permanent magnet was calculated. The flux variation of the magnetic flux vector and the main air gap before and after the installation of permanent magnet was analyzed. Iron was compared. The analysis shows that the upper permanent magnet deflects the direction of the magnetic flux density to the direction of the main air gap, and the lower magnet increases the magnetic flux inside the armature, both of which increase the magnetic flux of the main air gap, which is the main reason for the increase of electromagnetic force.