毛刷电接触对的接触电阻研究

Study on contact resistance of brush electrical contact

基于R.holm电接触理论建立了毛刷电接触对的接触电阻模型。采用有限元仿真确定了毛刷电接触对在插拔过程中只有弹性变形,并得到了接触电阻模型中的M值为1/2,进行了毛刷电接触对不同插拔深度上的接触电阻试验,通过试验数据拟合确定了毛刷电接触接触电阻模型中的K值为248。进行了毛刷、麻花针、线簧孔接触对在不同插拔深度的接触电阻对比试验,得到了毛刷电接触插拔深度的最优范围为2~2.2 mm,进行了毛刷电接触在2~2.2mm插拔深度时接触电阻寿命试验,基于接触电阻寿命曲线提出了预插拔工艺以提高接触电阻及插拔力的稳定性。毛刷电接触接触电阻研究为毛刷电接触的扩展设计、制造提供了参考。

The contact resistance model of the brush electric contact was established based on R.holm electric contact theory. In the process of insertion and extraction of the brush electrical contact, only elastic deformation was got by finite element simulation and M value of the contact resistance model was obtained （1/2）, the contact resistance tests on different insertion depth of the brush electrical contact were done and K value of the brush electric contact resistance model was obtained （248）by means of experimental data fitting. The contact resistance test in different insertion depth of the brush, the spring wire socket and twist-pin electrical contact were carried out, The results show that the advantage range of insertion depth of the brush electric contact is 2.0-2.2 mrn. Contact resistance life test of the brush electrical contact in 2.0-2.2 mm insertion depth were done for ten thousands times, pre insertion technology was proposed according to the change of contact resistance in the test. Study on contact resistance of the brush electrical contact can provide a reference for the extensive design and manufacture of brush electrical contact.