基于频域结构应力法的牵引电机机座关键焊缝寿命预测  

Life Prediction of Key Welds of Traction Motor Frame Based on Frequency Domain Structure Stress Method

作　　者：汤黎明 杨敏 Tang Liming;Yang Min(CRRC Zhuzhou Electric Co.,Ltd.,Zhuzhou 412000,China)

机构地区：[1]中车株洲电机有限公司,湖南株洲412000

出　　处：《防爆电机》2021年第4期17-20,共4页Explosion-proof Electric Machine

摘　　要：牵引电机是轨道交通列车的核心动力部件,随着列车运行速度等级不断提升,高频随机振动激励带来的交变载荷可能会导致焊接结构的疲劳失效。在牵引电机产品焊接结构设计过程中,常有多个备选方案,评估不同方案的焊缝在振动条件下的疲劳寿命的需求很迫切。现以某动车组牵引电机机座关键焊缝为研究对象,基于频域结构应力法计算两种备选结构在于IEC 61373-2010标准下的关键焊缝寿命。可以发现,有撑板的下悬挂关键焊缝寿命比明显优于无撑板结构。借助频域结构应力法,在产品设计阶段,即可较准确的预测焊接结构在振动条件下的寿命,有助于提升产品设计速度和产品品质。Traction motor is the core power component of rail transit train. With the continuous improvement of train speed level, the alternating load caused by high frequency random vibration excitation may lead to fatigue failure of the welded structure. In the designing process of the welding structure of traction motor products, there are often multiple alternatives, and it is urgent to evaluate the fatigue life of the welds with different schemes under vibration conditions. Taking the key welds of the traction motor frame of a certain EMU as a research object, this paper calculates the key welds life of the two alternative structures according to IEC 61373-2010 standard based on frequency domain structure stress method. It is found that the life of the key welds of the lower suspension with brace plate is obviously better than the structure without brace plate. With the help of frequency domain structure stress method, the life of welded structure under vibration condition can be accurately predicted in the product design stage, which is helpful to improve the product design speed and product quality.

关 键 词：电机机座 焊接结构 随机振动 频域结构应力法 疲劳寿命 

分 类 号：TM305.1[电气工程—电机]