关键词: 磁屏蔽罩, 磁力, 有限元分析

Abstract:

In the gradient DC magnetic field, the order of the magnetic force for the shield made from soft magnetic material was estimated. The magnetic force on a cuboid shield made from pure iron was studied by the finite element analysis (FEA) and experimental test. The preliminary results show that for a cuboid shield with inner dimension of 100mm×100mm×150mm and thickness of 20mm, placed within a DC magnetic field of about 0.2 T with average gradient 0.03T?m?1, its magnetic force is about 184N, close to its own gravity force. The analysis and test results show the magnetic force increases together with the field strength. The analysis results deviate from the experiment by about 21% under 0.2T field. Therefore, considering proper margins, FEA is an effective and reliable method to estimate the magnetic force exerted on shield by a gradient DC field.

Key words: Magnetic force, Finite element analysis, Magnetic shield