【作者】 曾美扬；

【导师】 张福全； 张世和；

【作者基本信息】 湖南大学 ， 材料工程， 2006， 硕士

【摘要】 风力发电机、高速电力机车用牵引电机等,为达到大功率、小体积的使用效果,广泛使用高导电性和高强度的铜合金。交流电机端环与导条的焊接是大功率异步牵引电动机制造的一项关键技术,开展其焊接工艺研究具有重要的意义,中国南车电机公司将此课题作为解决交流电机制造的一个重点项目,本文结合交流电机转子端环焊接的课题,对铜及其合金的焊接进行了研究,主要研究结论如下:1、通过氧乙炔火焰钎焊、感应钎焊、电阻钎焊等焊接方法的对比试验发现感应钎焊可获得优质的焊接接头,且感应钎焊的焊接效率也是最高的。2、采用中频整体感应钎焊,一次加热完成大功率异步牵引电动机转子端环与导条的焊接,焊接周期短,导条和端环受焊接热影响小,转子冲片绝缘几乎不受影响,焊接的机械强度好、整体质量高。3、为实现端环的整体焊接,保证焊接质量,感应线圈的设计是关键环节,通过试验研究,设计了不同大小的感应线圈,对于大型电机采用多段对称感应钎焊,从而解决了一机多用的焊接效果。4、合理的焊接材料、钎剂的选择匹配,焊接加热程序的设计,焊接部位的彻底清理将对端环的焊接质量具有极大的影响。采用端环的整体感应钎焊工艺,已成功焊接了上百台电机转子,并投入到风电、民用、铁路等行业营运的过程中,无一例出现问题。由此可见,该焊接工艺是安全可靠、切实可行的,同时也适合于工业化大批量生产。更多还原

【Abstract】 Copper alloy with high conductivity and high strength is widely used for wind mill generator and pulling motor used for electric express locomotive to reach to high power and small in size. The welding of end ring of alternating current machine and the conducting bar is the key technology for manufacturing of asynchronous traction motor with high power. China South Locomotive and Rolling Stock Industry Corporation had taken this significative study as a key project for the manufacturing of alternating current machine. According to the welding of end ring of alternating current machine, the welding of copper and copper alloy is described in this paper. Results obtained in this study are as follows.1.By the comparison of oxyacetylene gas brazing, induction brazing and resistance brazing, it was found that high-quality welding joint could be obtained by induction brazing, which also had the highest efficiency.2.The welding of end ring of the high power synchronous traction motor once and for all using medium—frequency induction brazing ,which showed a variety of advantages, such as short circle, low heat affecting of conducting bar and end ring, without influence for rotor sheet insulation and with high mechanical strength and high quality.The design of an induction coil was the key point during integral welding of end ring in order to get high quality.3.By the investigation, induction coils with different dimension were designed for large-scale electric machine using multi-symmetrical induction brazing, which solved the problem of a tractor serves several purposes.4.Appropriate welding material, election of soldering acid, design of welding heat process and cleaning up influenced the welding quality significantly.More than one hundred motor rotors have been welded using integral induction brazing of end ring, which just have been used successfully for the areas of wind power generation, civil using and railway and so on. It follows that this welding processing is reliable and practicable, and it is suited for large-lot production.更多还原