Sliding electrical contact performance of electromagnetic launcher system in rapid fire mode
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摘要: 从滑动电接触电阻大小的角度，详细分析了在时序放电条件下，两颗重约为5 g的电枢，以速度为1 000 m/s,166 Hz连续发射试验。通过近似计算电流所流经轨道电阻及电枢体电阻所产生的温升，对滑动电接触电阻的影响。结果表明:连续发射运行模式下，受轨道表面温度上升的影响，第二发电枢的滑动接触电阻略高于第一发电枢的滑动接触电阻，表面滑动电接触性能受到温升的影响，在两连发的发射情况下，其影响虽不是很大，但多发高频连续发射就必须考虑热管理问题。 Abstract: The high speed sliding contact is between the armature and the rails in the electromagnetic launcher experiments. The contact performance can be influenced by the frictional heating and current joule heating, and the influence is more evident in the rapid fire mode due to the rail temperature rise. This paper discusses the contact performance with the sliding contact resistance. In the experiments, two 5-g armatures are launched with the speed of 1 000 m/s, and frequency of 166 Hz. The effect on the contact resistance of the temperature rise is calculated approximately. The results show that the contact resistance of the second armature is higher than that of the first armature with the temperature rise. In addition, thermal management should be adopted in the multi-armature launching in rapid fire mode.
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