方体亥姆霍兹线圈地磁模拟器用于模拟地磁导航器件工作环境的磁场变化,其磁场均匀性主要受线圈几何形状及结构尺寸的影响。为了得到其磁场均区与结构尺寸的关系,构建了方体亥姆霍滋线圈的数学模型,导出了其内部任意点处磁场矢量解析式。应用ANSYS软件对模拟器内磁场分布进行了数值计算,并通过实验测得其中心磁场强度与励磁电流的关系。分析表明,解析解与数值解及实验结果具有较好的一致性。

The Sauare Helmholtz coil geomagnetic field simulator is used to simulate the geomagnetic field change of environment in which geomagnetic navigation device operates, and its homogeneity is mainly affected by the coil's geometric shape and structural dimensions. In order to obtain the relationship between the magnetic field uniform area and the coil's structural dimensions, the mathematical model of the square Helmholtz coil was constructed and the vector analysis formula of magnetic field distribution at any point in its internal was deduced. Then ANSYS was used to calculate magnetic field distribution inside the simulator, and the relationship between the internal magnetic field intensity and the exciting current was measured through the experiment. The Analysis indicates that the analytical and numerical solutions have good consistency with experimental results.