小开口磁器件内通电悬丝形变有限元分析方法

Finite element analysis of pulsed wire deformation in the small gap of permanent magnetic device

针对测量小开口磁器件磁场的脉冲悬丝法无法建立三维磁场中悬丝形变解析推导以及无法应用于磁场结构设计优化的问题,依据磁场中通电悬丝运动的基本原理,提出基于有限元的永磁器件结构参数和磁场分布改变的通电悬丝形变分析方法。建立磁件-悬丝系统的电流场、磁场、应力场三维耦合仿真模型,用耦合场有限元计算替代近似的解析求解,对不同永磁磁件以及周期磁场中悬丝的形变进行对比,分析通电悬丝在均匀或各向异性周期磁场中各方向的形变规律,并给出建模和悬丝形变分析的实例。结果显示悬丝系统有限元仿真平台建立了悬丝形变和磁场分布之间的联系,可用于小开口磁件的结构设计和其内磁场分布规律的改善。

It is always a problem of the magnetic field measurement in small via hole of a long magnet device,because the size,sometimes less than 0.5mm,is too limited for the magnetic probe.The infromation of magnetic field can be obtained from the deformation of a current wire in it.In this paper,instead of analytical deduction,a wire analysis method based on finite element analysis（FEA） was proposed to build the relationship between the wire deformation and the magnet parameter,e.g.the magnet size and the distribution etc.The coupled analysis theory of electric,magnetic and stress field using FEA is discussed,the basic models of different shape magnet are built,and the simulation results were presented.It shows that the relationship between magnet parameters and wire deformation could be built by this platform,and this method could be used for the improvement of magnet design and magnetic field distribution.