电流密度对碳纤维-铜-石墨复合材料接触电压降的影响  

Influence of Current Density on the Contact Drop of Carbon Fiber-Copper-Graphite Composite

作　　者：凤仪[1] 陶宁[2] 王文芳[1] 王成福[1] 

机构地区：[1]合肥工业大学材料学院 [2]中国科学技术大学

出　　处：《中国机械工程》2001年第5期592-594,共3页China Mechanical Engineering

基　　金：国家自然科学基金资助项目! (5 97710 12 );安徽省自然科学基金资助项目! (96 0 30 8)

摘　　要：研究了碳纤维 -铜 -石墨复合材料在电磨损条件下 ,电流密度的变化 (4～ 1 6A/cm2 )对复合材料接触电压降的影响。结果表明 ,碳纤维 -铜 -石墨复合材料电刷与换向器之间的接触电压降具有非线性特征 ,即电流密度在一定范围内变化对接触电压降影响不大 ;用扫描电子显微镜观察了磨面形貌 ,发现在电刷与换向器之间形成的润滑膜保证了接触电压降的稳定 ,改善了换向性能 ;对复合材料接触电压降的变化机理进行了初步探讨。Under different current density (from 4A/cm 2 to 16A/cm 2) conditions, the influence of current density on the contact drop of CF-Cu-G composite are studied. The results are as follows:the lubrication film between brush and commutator makes the contact drop steady and improves commutation ability of brush,the total contact drop per brush pair doesn't increase linearly with the increase of current density or the total contact drop per brush pair doesn't vary with the current density throughout the current density range from 8A/cm 2 to 16A/cm 2.

关 键 词：碳纤维-铜-石墨复合材料 电磨损 电流密度 接触电压降 电机 电刷 

分 类 号：TM303.2[电气工程—电机] TB333[一般工业技术—材料科学与工程]