There are four reasons. The first is the reason for power supply: the voltage is high or low. Under a specific load, if the voltage changes should be transformed at+10%to -5%of the rated value, the motor will be overheated; the three -phase voltage of the power supply shares; The imbalance between the three -phase electric voltage is more than 5%, which will be overheated by the wound; the lack of phase runs, and the experience shows that the agricultural motor is burned by 85%. More than 85%of it is caused by lack of phase operation. The second is the reasons for the pump: choose non -supporting power, small Mara cars, and the motor runs over for a long time, making the motor temperature too high; starting the motor that is too frequent, the quota is a short -term or intermittent working system continuously work. The number of startups should be limited, the heat protection is used correctly, and the quota calibrated on the motor is used. The third is the cause of the motor body: the error of the connection method, the △ shape is made into a Y -shaped to quickly increase the temperature of the motor; the stator winding is short -circuit, inter -turning short -circuit or local grounding. Burns out; the mouse cage rotor is broken or defective, the motor runs for 1 to 2 hours, and the iron core temperature rises rapidly; the ventilation system fails, check whether the fan is damaged, whether the rotation direction is correct, whether the ventilation channel is blocked; the bearings wear, rotor rotor, rotor rotor The eccentric scanning makes the fixed rotor iron out with a metal impact sound. The temperature of the iron core rises rapidly. In severe cases, the motor smokes, and even the coil is burned. Fourth, the cause of the working environment: The motor winding is attached to the winding of the moisture or dust, oil, and oil pollution, resulting in a decrease in insulation. The insulation resistance of the motor should be measured and cleaned and dry; the ambient temperature is too high. When the ambient temperature exceeds 35 ° C, the temperature of the air inlet will cause the motor temperature to be too high, and they should try to improve their working environment. Such as shading in the shed. Note: Due to the failure of electricity, please obtain electrical maintenance of professional qualification certificates.