考虑初始接触压力的滑动电接触界面磁扩散模型  

A Magnetic Diffusion Model of Electromagnetic Launcher Considering Initial Contact Pressure

作　　者：张嘉炜 鲁军勇[1] 谭赛[1] 张永胜[1] 李白[1] Zhang Jiawei;Lu Junyong;Tan Sai;Zhang Yongsheng;Li Bai(National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering,Wuhan 430033 China)

机构地区：[1]海军工程大学舰船综合电力技术国防科技重点实验室,武汉430033

出　　处：《电工技术学报》2022年第2期488-495,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51925704,51877214,51907203);湖北省自然科学基金(2019CFB371,2019CFB373,2020CFB341);中国博士后特别基金(2019T120972)资助项目。

摘　　要：该文提出一种考虑初始接触压力的磁扩散模型分析电磁轨道发射装置中的磁感应强度、电流密度、焦耳热、电磁力分布、趋肤深度随时间的演变。该模型分析枢轨接触状态对接触面导电特性造成的差异,从而得到不规则电枢形状、驱动电流波形条件下的多场分布。计算结果表明,过盈量为1mm时,实际接触区域处于理论接触区域的中段,而电流初始聚集在实际接触区域的枢尾一端,随后向电枢头部移动。分析其他四种接触电导分布情况发现,在实际接触区域由压力造成的导电性能差异不会主导电流的分布。电流由于趋肤效应,在轴向距离电枢越近的导轨趋肤深度越浅,模型计算结果与理论公式比较误差较小,且斜坡电流的趋肤效应比阶跃电流更明显。该研究可以为电枢转捩、趋肤效应、电枢结构优化提供研究方向,为三维多场计算奠定基础。This paper proposed an optimized magnetic diffusion model to analyze magnetic flux density,current density,Joule heat,electromagnetic force and current skin depth in different time and position of an electromagnetic launcher.The model concerned on the difference caused by the contact state,so that the multi-field distribution under the conditions of irregular armature shape,driving current waveform can be obtained.The result shows that when the interference is 1 mm,the actual contact area is in the middle of the theoretical contact area,and the current concentrates at the rear end of the actual contact area and then moves ahead.It is found that the difference in electrical conductivity of the actual contact area would not affect the current distribution after the other four typical contact states were analyzed.Due to the skin effect,the skin depth close to the armature is shallow,and the ramp current has more obvious skin effect than the step current.The results deduced by this model are consistent with the theoretical formula.This study can provide an approach to observe transition,skin effect and armature structure optimization,laying a foundation for 3 D field calculation.

关 键 词：电磁轨道发射装置 过盈接触 磁扩散模型 趋肤效应 

分 类 号：TM359.4[电气工程—电机]