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本文研究了国外引进的370kW大型直流电机升高片疲劳断裂的原因。研究工作包括对电机转子绕线端部的实验模态分析,动载荷分析和有限元分析。分析结果表明,电机在制动过程中的惯性冲击载荷;电荷运行中齿谐波与绕线端部结构共振引起的动载荷,使升高片根部的动应力接近或超过材料的疲劳极限应力。由此,造成了升高片根部的断裂。研究结论不但为该设备的索赔提供了可靠的理论依据,而且对国内同类电机的设计制造也具有一定的参考价值。
This paper studies the reasons for the fatigue fracture of a 370kW large DC motor introduced abroad. Research work includes the experimental modal analysis of the rotor winding ends, dynamic load analysis and finite element analysis. The results show that the dynamic load caused by the motor’s inertial impact load during braking process and the dynamic resonance caused by the tooth harmonics and the winding end structure during the operation of the electric motor cause the dynamic stress at the root of the raised plate to approach or exceed the fatigue limit stress of the material. As a result, the rupture of the raised root section is caused. The conclusion not only provides a reliable theoretical basis for the claim of the equipment, but also has a certain reference value for the design and manufacture of similar motors in China.