电磁成形过程中电流的测试

脉冲电流是一种瞬间电流，特别适当频率很大时，电流的通过线圈时间特别短，这就给脉冲电流的测试带来很多困难。而当电流特别大时，就给测试带来很多不变之处。电磁成形过程中回路中的电流就是这种脉冲大电流。利用文献1]中提到的测大电流的方法——电流测量线圈法，测出一部分电流波形，但是测出的电流波形和理论的波形相差甚远。通过分析对比，在原来测试电流方法的基础上，经过改进，找到了一种比较适合测试电磁成形回路中瞬间大电流的方法，并利用这种方法测试出电流的波形。测出的电流波形和理论的电流波形十分的接近，同时得到了电流变化的一些规律。

Test of the electric current in the electromagnetic forming

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.