There are mixed magnetic field system of axial and radial in hybrid stepping motors, and the magnetic field in the gap (or teeth layer)is distributed uneven along the axial direction.
混合式步进电动机内部是径向和轴向混合的磁系统，气隙或齿层的磁场沿电机轴向非均匀分布，将问题简化为二维磁场后要得到精确结果有一定的困难。
The finite element method is used to calculate five-phase hybrid stepping motor's tooth layer magnetic field parameters.
用有限元方法，计算出五相混合式步进电动机齿层部分磁场参数；
The perfect matched layer (PML) technique is used in ADI-FDTD calculation for the first time. The expressions for the exponential time-stepping algorithm in PML are derived.
首次把完全匹配层(PML)边界条件应用到adi FDTD计算中，采用幂指数形式的时间步进算法，推导了相应的迭代公式。
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