控制棒可动线圈电磁驱动机构电磁力增强机理

Increased electromagnetic force in amovable magnetic coils control roddrive mechanism

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。

The electromagnetic field distribution was studied to explain the increased electromagnetic force after installing permanent magnets in a movable magnetic coils control rod drive mechanism. The electromagnetic force around the armature surface and the magnetic flux in the working air gap before and after installation of the permanent magnets was analyzed using the Maxwell tension method and the FEM. The results showed that the upper permanent magnets modified the magnetic flux towards the air gap while the lower permanet magnet increased the magnetic flux in the armature. Both the upper and lower permanet magnets increased the magnetic flux in the air gap as the primary reason for the increased electromagnetic force