螺旋线电流轴线上磁场的计算与分析

应用数值模拟的方法,细致地分析了螺旋线电流轴线上磁场随螺距和位置的变化关系．计算结果表明,当螺距较大时,其磁场分布与圆形电流的磁场分布相差很大;但当螺距较小或距螺旋线中心较远处,磁场几乎与圆形电流产生的磁场相当,可用表述圆形电流轴线磁场的简单公式来近似．

Evaluation and analysis of magnetic field distribution along axis of a helical current

Using numerical simulation method, the variation of magnetic field-strength along the axis of helical current with the helical pitch and position is analysed in detail. Evaluation result shows that, when the pitch is larger, there is a great difference in field-strength induced respectively by helical and circular currents and, however, the magnetic fields induced by them would be almost the same if the pitch were shorter or the position were farther from the axis of helix so that the field of the former can be approxima- ted by that of the latter.