基于相关性判据的磁体磁性磁偶极子近似距离条件分析

摘要

A method to analyze range condition of magnetic dipole approximation for a magnet magne-tism is developed based on the correlation of the magnet′s field distribution and magnetic dipole mo-del.By utilizing this method,the magnetic dipole approximation degree of a type longitudinal uniform magnetic ellipsoid is calculated at the different CPA distance path of different altitude horizontal plane.Analysis results show that the range condition of magnetic dipole approximation is nearly twice of that of ellipsoid′s long axis.The method may be used to all magnet when the magnetism material distribution is known by use of the finite element analysis (FEA)software,such as ANSYS,Ansoft Maxwell and so on.%针对磁体磁偶极子近似的距离条件问题，提出了基于磁体磁场分布与磁偶极子模型相关性的判定方法。解析计算了不同高度平面内、不同CPA距离直线路径上典型纵向均匀磁化旋转椭球的磁场。相关性分析表明：磁偶极子近似的距离接近两倍的长轴长度。若借助 ANSYS、Ansoft Maxwell等有限元分析软件，该方法可推广于一切已知磁性材料分布的磁体。