关键词: 电动汽车；绝缘故障；凝露现象；密封性测试；驱动电机

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