Overheating of water pump motor

There are four reasons. One reason is related to the power supply: if the voltage is too high or too low, under specific loads, if the voltage fluctuation range should be outside+10% to -5% of the rated value, it will cause the motor to overheat; Asymmetric three-phase voltage of the power supply, with a phase to phase imbalance of more than 5%, can cause winding overheating; Due to phase loss operation, experience has shown that over 85% of agricultural motors being burned out are caused by phase loss operation. Therefore, it is necessary to install phase loss protection devices for the motors. The second reason is related to the water pump: the selection of power is not matched, the small horse pulls the big car, and the electric motor runs under overload for a long time, causing the temperature of the electric motor to be too high; Motors that start too frequently and have a short-term or intermittent working system are continuously operated. The number of starts should be limited, thermal protection should be selected correctly, and it should be used according to the rated value on the motor. The third reason is the motor body: incorrect connection, mistakenly connecting the △ shape to the Y shape, causing the temperature of the motor to rise rapidly; The stator winding may have phase to phase short circuits, turn to turn short circuits, or local grounding. In mild cases, the motor may overheat locally, and in severe cases, the insulation may be burned out; The squirrel cage rotor has broken bars or defects, and the temperature of the iron core rises rapidly when the motor runs for 1 to 2 hours; If the ventilation system malfunctions, check whether the fan is damaged, whether the rotation direction is correct, and whether the ventilation duct is blocked; Bearing wear and rotor eccentricity can cause metal collision sounds between the stator and rotor cores, leading to a rapid increase in core temperature. In severe cases, the motor may smoke or even burn out the coils. The fourth reason is related to the working environment: the motor winding is affected by moisture or dust, oil stains, etc. adhere to the winding, resulting in a decrease in insulation. The insulation resistance of the motor should be measured and cleaned and dried; The ambient temperature is too high. When the ambient temperature exceeds 35 ℃ and the inlet air temperature is high, it will cause the temperature of the motor to be too high. Efforts should be made to improve its working environment. Such as setting up shelters for shade. Attention: If there is a malfunction due to electrical reasons, it should be repaired by an electrician who has obtained a professional qualification certificate. People with limited knowledge should not blindly repair to prevent personal injury accidents.
Deep well submersible pump
First, let's take a look at how much the current of the water pump is different from the current during normal operation. If it is smaller than usual (based on 2-3 times the normal current), there may be problems such as impeller wear and blockage of the check valve at the top of the pump head. If the current is as high as usual, it may be due to issues such as pipe gasket leakage, pipe leakage, or pump body leakage. If the current is higher than usual during operation, it can be determined that it is a problem of wear and tear on vulnerable parts. Additionally, if the cable is damaged, the amount of water will be the same as usual, but the current will increase. The current of a 3-phase 380V motor is generally 2.2A. The above reasons can be identified by maintenance personnel who frequently repair deep well pumps.