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What are the reasons why the motor temperature is too high when the pump is running?

Date:2022-06-10   Author:XINDA MOTOR

The common media conveyed in the water pump industry are clean water, corrosive liquids, oils, sewage with particles, etc. Among them, clean water pumps are the most widely used and have the largest user group. Recently, an old customer asked our company for technical support. Personnel consultation: "Why is the motor temperature too high during the operation of the axial flow pump?" The drive of the water pump is completed by the motor, so the high motor temperature is also one of the common abnormal phenomena of the clean water pump. What are the reasons why the motor temperature is too high when the clean water pump is running, for your reference.

The reason for the pump

The power does not match, the small horse-drawn cart, and the motor overload for a long time, which makes the motor temperature too high. The starting frequency is too high, the quota is short or the motor running intermittently runs continuously. The starting time should be limited, and the correct selection of the thermal protector should be calibrated according to the rating on the motor.

Second, the problem of the motor itself

The motor connection method is wrong, the △ shape is wrongly connected to the Y shape, thereby rapidly increasing the temperature of the motor; the stator is short-circuited between phases, inter-turn short-circuit or partially grounded, the motor is slightly overheated locally, and burns out in serious cases; if the squirrel-cage rotor is damaged or If there is a fault, the temperature of the core will rise rapidly when the motor runs for 1 to 2 hours; otherwise, the temperature of the core will rise rapidly. If the ventilation system fails, check whether the fan is damaged, whether the rotation direction is correct, and whether the ventilation channel is blocked; the bearing is worn, the rotor eccentrically sweeps, and the stator iron core encounters metal collision sound, the temperature of the iron core rises rapidly, and the motor emits smoke or even serious. Burn the coil.

3. Reasons for working environment and occasion

Moisture or dust, oil, etc. of the motor windings adhere to the windings, causing the lower edge. The edge resistance of the motor should be measured, clean and dry; the ambient temperature is too high. When the ambient temperature exceeds 35°C, the intake air temperature is too high, which will make the temperature of the motor too high. We should strive to improve their working environment. Such as shade, etc. Note: Due to the electrical fault, the professional qualification certificate for electrician maintenance should be obtained. Those who know the solution cannot blindly repair it to prevent personal injury accidents.

Fourth, the reasons for the power supply

High or low voltage, under certain loads, if the voltage variation should be +10% to -5% of the rated value, it will cause the motor to overheat; the three-phase voltage of the power supply is asymmetric, and the three-phase voltage unbalance of the power supply is greater than 5 %, will cause the winding to overheat. The lack of phase operation experience shows that more than 85% of the agricultural motor burnout is caused by the lack of phase, and the lack of phase protection device should be installed on the motor.

The above four points are the most common reasons for the high temperature of the clean water pump motor. Users and friends who have such problems may wish to eliminate them according to the above reasons.