通过对坡印亭矢量的散度的分析，阐明了电机气隙中径向能流和切向能流的变化和传递。
The variation and transmit of the radial and tangential energy flow in the air gap of electrical machines are illustrated by analyzing the divergence of Poynting vector.
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。
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.
采用减小轴向非工作气隙和引入双径向工作气隙的低功耗策略，提出了低功耗耐高压单向比例电磁铁的新结构；
Adopting a low-power strategy by introducing double radial operating airgaps and reducing axial non-operating airgaps, a low-power unidirectional proportional solenoid for high pressure is presented.
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