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增加或保障电枢与轨道具有较大接触面是电磁轨道炮设计与试验中的一个重要目标,但实际上接触面大小的作用仍有待探讨。为此,通过仿真计算分析了接触面上电流分布区域的位置与电流大小。结果表明:电流仅从小部分接触面穿过,在满足该接触面大小的情况下,接触面再增加或接触面大小对轨道电枢接触的电磁性能影响不大;同时,电流流过的区域大小与电枢和轨道的尺寸以及电流随时间的变化有关。对被分析的结构,在电流平顶阶段,接触面积为电枢侧面的20%(接触面长度约为8 mm,实际接触面大小约为240 mm2)已可认为足够大,接触面再加大最大电流密度已基本不变。因此,在固定尺寸的电磁轨道炮中,不必过分追求大电枢/轨道接触面,保证一个接触面大小满足电接触的电气性能即可。
Increasing or guaranteeing that the armature and the track have a large contact surface is an important goal in the design and testing of the electromagnetic rail gun. However, the role of the contact surface size remains to be discussed. Therefore, the position and current of the current distribution area on the contact surface are analyzed by simulation. The results show that the current can only pass through a small part of the contact surface. When the size of the contact surface is satisfied, the contact surface increases or the contact surface size has little effect on the electromagnetic performance of the orbital armature contact. Meanwhile, It depends on the size of armature and rail and the change of current over time. For the structure analyzed, the contact area is 20% of the side of the armature (contact length is about 8 mm and the actual contact surface size is about 240 mm2) at the current flat top stage, which is considered large enough and the contact area enlarged The maximum current density has been basically unchanged. Therefore, in a fixed-size electromagnetic rail gun, it is not necessary to excessively pursue the armature / rail contact surface to ensure that the size of one contact surface meets the electrical performance of the electrical contact.