变频电机电磁线绝缘膜电树枝化击穿机理研究  

The Mechanism of Breakdown by Electrical Tree of Magnet Wire Insulating Film Used in Inverter-fed Motor

作　　者：罗杨[1,2] 吴广宁[1] 周力任[1] 曹开江[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031 [2]西南交通大学材料科学与工程学院,成都610031

出　　处：《绝缘材料》2010年第1期49-51,55,共4页Insulating Materials

基　　金：国家自然科学基金(50377035);新世纪优秀人才支持计划(NCET-07-0718)

摘　　要：阐述了调速牵引电机中电磁线绝缘破坏的问题及电树产生和发展的机理。以完好的和含有杂质的变频电机用电磁线为试样,在高压下老化直至击穿,对击穿点进行扫描电镜和能谱分析。试验结果表明,两试样的击穿均为树枝状击穿,金属杂质的存在降低了绝缘膜的电气强度。The insulation problems of the magnet wire of inverter-fed motors were demonstrated,and so was the mechanism of the birth and development of electrical trees.Some pure and impure magnet wires were selected as samples on which aging tests under high voltage were performed until the insulation of magnet wires fails.The breakdown spots were analyzed by scanning electron microscope（SEM） and energy spectrum analysis.Both the samples have dendritic type breakdown and it reveals that the electric breakdown strength of the envelope of the magnet wire is very low when containing metal impurity.

关 键 词：变频电机 电磁线 电树枝 击穿 

分 类 号：TM245[一般工业技术—材料科学与工程] TM201.44[电气工程—电工理论与新技术]