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Abstract：
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Impulse current is an instantaneous current. The period that the current passes through the coil is very short if the frequency is high. It is very difficult for us to test the impulse current if the current is strong. The current in electromagnetic forming is the impulse current. The wave form of the electric current is quite different from the theoretical wave form by making use of the way in the literature. By analytical contrast, a suited method has been found to test the instantaneous electric current in the return circuit and its wave shape. There fore, some changeable laws of the electric current have been found by this way. The wave form of the electric current we got is similar to the theoretical wave form.
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Funds：
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国家自然科学基金项目 (50375016) 资助;;
科技部中欧合作项目资助
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AuthorIntro：
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Reference：
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[1] 清华大学电力系高电压技术专业冲击大电流技术[M]北京:科学出版社,1978:136138
[2] 李忠、李春峰、赵志衡电磁成形中的测量[J]塑性工程学报,2004(4):8184
[3] 李春峰高能率成形技术[M]北京:国防工业出版社,2001:2129
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