一种基于磁偶极子模型的铁磁体近场计算方法

A Calculation Method for the Ferromagnetic Near-field Based on Magnetic Dipole Model

为计算铁磁体的感应磁场,在普通磁偶极子模型的基础上,结合微元的思想,研究了微元磁偶极子模型的计算方法,推导出了空间任一点感应磁场值的精确表达式。弥补了普通磁偶极子模型不能精确计算近场源点磁场的不足。分别用普通磁偶极子模型和微元磁偶极子模型计算了圆柱形铁磁体的感应磁场,结果表明,微元磁偶极子模型计算感应磁场精确度较高,可应用于工程实际。

In order to calculate the induced magnetic field, a calculation method of the micro magnetic dipole model is studied based on the ordinary magnetic dipole model. The exact expression of the magnetic values at any point in the space is derived. The problems of common magnetic dipole model which can not accurately calculate the near-field source magnetic field values are solved. By calculating the induced magnetic field by the ordinary magnetic dipole model and the micro magnetic dipole model for cylindrical ferromagnet, the results show that the micro magnetic dipole model is of high accuracy, which can be applied to practical engineering.