变频牵引电机定子绕组电磁线寿命特性的研究

为研究变频调速牵引电机绝缘过早失效的机理,进行了定子绕组电磁线多因子联合作用绝缘寿命试验,利用一元二参数Weibull分布统计分析了不同电压幅值、频率和温度下的绝缘寿命试验数据,并研究了电磁线。提出了高频脉冲条件下多因子联合老化寿命模型,比较3种条件下的寿命模型与实验结果得出其相关系数均>0.89,验证了模型的正确性,可为变频调速牵引电机的设计提供理论依据。

Study on the Lifetime Characteristics of Magnet Wires for Inverter-fed Traction Motor

Inverter-fed traction motor is one of the key components in express locomotive. In this paper, in order to study the premature failure mechanism of insulation for traction motor, magnet wires used in stator winding of traction motor are investigated under thermal-electrical stress. Insulation lifetimes of magnet wires are tested under different voltage, frequency and temperature. And the test data under different conditions are analyzed by the statistic analysis method of Weibull distribution. Then a new multi-stress lifetime model for high frequency pulse is developed. The relativity between lifetime model and experimental data is discussed under three conditions. The validity of multi-stress lifetime model is proved by calculating the correlation coefficient. So it could provide fundamental basis for the design on traction motor.