基于nCode Design-Life的永磁同步电机主轴的疲劳特性分析  

Fatigue Characteristic Analysis of the Rotor of Permanent Magnet Synchronous Motor Based on nCode Design-Life

作　　者：于慎波[1] 李红[1] 翟凤军 钟双双[1] 夏鹏澎 

机构地区：[1]沈阳工业大学机械工程学院,沈阳110870

出　　处：《组合机床与自动化加工技术》2017年第1期50-53,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金项目(51175350);沈阳市科技计划项目(F15-199-1-13)

摘　　要：针对某型号永磁同步电机主轴局部出现裂纹或断裂现象展开了分析研究。首先用解析法和数值法对电机主轴进行了二维电磁力计算分析,确定了作用在主轴上的载荷谱。然后利用n Code Design-Life中的S-N分析方法,对永磁同步电机的主轴进行疲劳特性分析。得到主轴的疲劳损伤云图,结果显示在主轴输出端第一变截面处出现了应力集中。在瞬态电磁力和输出脉动转矩循环作用下,存在断轴隐患。提出了在变截面处采用凹圆角的加工方法,可有效的减少应力集中,提高主轴寿命。为永磁同步电机的可靠性设计提供了参考。This paper researches the phenomenon of the crack and the break appearing on the rotor of Permanent Magnet Synchronous Motor （PMSM）. Firstly, 2D electromagnetic force on the rotor is analyzed and computed by analytical and numerical method. Load spectrum on the rotor is defined. The fatigue characteristics of the rotor are analyzed by using S-N analysis method of nCode Design-Life. The stress concentration appears on the first section on the output side of the rotor from the fatigue damage distributing. The danger of broken shaft is hidden under the cycle action of transient electromagnetic force and output ripple torque. Based on this, the paper introduces the machining method of concave fillet at the variable section, which can effectively reduce the stress concentration and increase the life span of rotor. The achieved results can pro-vide the reference of reliability design of PMSM.

关 键 词：疲劳分析 永磁同步电机 电磁力 

分 类 号：TH166[机械工程—机械制造及自动化] TG506[金属学及工艺—金属切削加工及机床]