Abstract: In order to solve the insulation failure of the drive motor in the application of electric vehicle, the structure of the drive motor electrical box is easy to cause condensation phenomenon. This paper first analyzes the motor design, motor assembly and vehicle application, and then analyzes the potential possible causes and carries out risk assessment. Through test verification, the generation and treatment of motor insulation failure are analyzed in detail, and the cause of motor insulation failure is determined. Through the tightness test of the drive motor bench, the effectiveness of the improvement measures is verified. By adjusting the position of the ventilation plug of the drive motor electrical box, the condensation phenomenon of the drive motor is fundamentally solved to ensure the good operation of the drive motor, and the problem that the pure electric vehicle could not run due to the insulation problem of the drive motor is solved.

Key words: Electric vehicle; Insulation fault; Condensation phenomenon; Tightness test; Drive motor

摘要： 为了解决电动汽车在整车应用层面出现的驱动电机绝缘故障，特别是驱动电机电气盒 结构状态易于引发凝露现象。文章首先从电机设计、电机装配和整车应用等层面进行分析， 然后对其潜在可能原因进行分析并开展风险评估，通过试验验证对电机绝缘故障的产生与处 理进行详细分析，并确定电机绝缘的故障原因所在。通过驱动电机台架密封性测试，验证改 善措施的有效性，通过调整驱动电机电气盒透气塞位置，从根本上解决驱动电机工作的凝露 现象，确保驱动电机运行良好，解决了纯电动汽车因驱动电机绝缘问题而引发的无法行驶问 题。

关键词: 电动汽车；绝缘故障；凝露现象；密封性测试；驱动电机