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中文摘要：
工作在短脉冲状况下的磁开关的伏秒积存在着实际测量值与理论计算值不一致的偏差，为了分析出现偏差的原因，提出利用傅立叶变换分析磁开关电压波形，得到磁开关电压的频谱，并利用有限元法计算所得频谱下磁芯截面上的磁场。利用所提出的方法对一磁开关进行了分析，在有限元仿真软件（ANSYS）中建立磁芯与绕组的实体模型，然后由该模型计算的磁开关伏秒积与理论值对比，得出磁芯体积的实际利用率为79．21％。同时，ANSYS计算结果表明，在短脉冲作用下磁开关内的磁场大部分集中在磁芯表面，导致了磁芯利用率减小，这是实际值与理论值不一致的主要原因。
英文摘要：
There is a disagreement between the exPerimental result and the calculated one according to the voltage second formula for the magnetic switch subjected to short pulse. In order to make clear the reason of disagreement, Fourier transform is exploited to analyze the voltage waveform of magnetic switch, and spectrum of voltage is obtained, and then the magnetic field of magnetic core is calculated by finite element method（FEM） according to the spectrum. A design procedure for a practical magnetic switch is carried out. The entity model of magnetic core and winding is set up in the FEM analysis software ANSYS, and the material attribute such as relative magnetic permeability is assigned. Magnetic filed along a radial of magnetic core including static item and all harmonic ones is calculated. The voltage-second of magnetic switch is 9.98 × 10^-3 V · s calculated in terms of magnetic flux density across ferrous lamina multiplied by lamina cross-sectional area. However, According to the formula, voltage-second is 12.6×10^-3 V ·s, so the utilization efficiency of magnetic core is 79.21%. At the same time, the distribution of calculated magnetic field along the radial mainly focuses on the surface of magnetic core, which leads to the decrease of utilization efficiency of magnetic core and is the main cause of the disagreement.
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