农用电动机正常运行时,发出的声音是平稳、轻快、均匀的;如果出现尖叫、沉闷、摩擦、振动等刺耳的杂声,说明电动机有了故障。首先应判断是机械还是电气的原因引起的,方法是接上电源,有不正常的声音存在,切断电源,不正常声音仍存在,则为机械故障;否则为电气方面故障。1机械故障引起的异声 When the farm motor is running normally, the sound is smooth, light and even. If there is screaming, dull, friction, vibration and other harsh noise, the motor has a fault. First of all should judge whether it is caused by mechanical or electrical reasons, the method is connected to the power supply, there is abnormal sound exists, cut off the power, abnormal sound is still there, then the mechanical failure; otherwise, electrical failure. Abnormal sound caused by mechanical failure