Let’s find out the motor overheat reason together.
I. The power supply reason: the slurry pump voltage is high or low. Under certain load, if the voltage fluctuation range should be +10% to -5% of the rated value, the motor will overheat; the power supply three-phase voltage Asymmetry, the phase imbalance of the three-phase voltage of the power supply exceeds 5%, which will lead to overheating of the winding; the phase loss operation, the experience shows that more than 85% of the agricultural motor is burned due to the lack of phase operation, and the motor should be installed with phase loss protection device.
II. The reason of the pump: the power is not matched, the small horse-drawn carriage, the motor is overloaded for a long time, the motor temperature is too high; the motor that starts too frequently, the quota is short or intermittent, the motor works continuously. The number of starts should be limited, and the thermal protection should be properly selected and used according to the calibration quota on the motor.
III. The reason of the motor itself: the connection error is wrong, the △ shape is mistakenly connected to the Y shape, so that the temperature of the motor rises rapidly; the stator winding has phase-to-phase short circuit, turn-to-turn short circuit or local grounding, and the motor is partially overheated,or the insulation is burnt out; the squirrel cage rotor is broken or defective, the motor runs for 1 to 2 hours, the core temperature rises rapidly; if the ventilation system fails, the fan should be inspected for damage, the rotation direction is correct, and the slurry pump vent hole is blocked. The bearing wear and the rotor eccentric broom make the iron of the fixed rotor rub the metal to make a sound, the temperature of the iron core rises rapidly, and when the motor is serious, the motor smokes and even the coil burns.
Ⅳ. The working environment: the motor windings are damp or dust, oil, etc. are attached to the windings, resulting in lower 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 ° C, the inlet air temperature is high, the temperature of the motor will be too high, and efforts should be made to improve the working environment. Such as scaffolding and so on. Note: If there is a malfunction due to electrical reasons, the electrician who has obtained the professional qualification certificate should be repaired. Those who know nothing about it should not be blindly repaired to prevent personal injury.
If the above reasons can’t help you out, please contact our engineers.