1、 the pump itself
Single Stage End Suction Pump uses power mismatch, small horse-drawn carts, and electric overload operation for a long time, making the motor temperature too high; A motor that starts too frequently and has a short-time or intermittent duty system works continuously. The number of starts should be limited, the thermal protection should be correctly selected and used according to the rated rate on the motor.
2、 the reason for the motor
Single Stage End Suction Pump motor connection is wrong, and the △ shape is mistakenly connected to the Y shape, which causes the temperature of the motor to rise rapidly; The stator windings have inter-phase short circuit, inter-turn short circuit or local ground, the motor is partially overheated when light, and the insulation is burned out when serious. The squirrel cage rotor is broken or defective, the motor runs for 1 to 2 hours, and the iron core temperature rises rapidly; If the ventilation system is faulty, check whether the fan is damaged, whether the rotation direction is correct, and whether the ventilation channel is blocked. Bearing wear, rotor eccentric sweep makes the rotor core rub against each other to emit metal percussion sound, the core temperature rises rapidly, and the motor smokes and even the coil burns.
3、 power supply reasons
High or low voltage, under a specific load, if the voltage variation range should be outside the rated value of + 10% to -5% will cause motor overheating; The three-phase voltage of the power supply is asymmetrical, and the phase imbalance of the three-phase voltage of the power supply exceeds 5%, which will lead to overheating of the winding; The experience shows that more than 85% of the agricultural motor burned down is caused by the lack of phase operation, and it is necessary to install the lack of phase protection device.
4、 It is due to the working environment
The motor winding is damp or dust, oil, etc. attached to the winding, resulting in reduced 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, which will make the temperature of the motor too high, and the working environment should be improved. Such as building a shelter for shade. Note: Due to electrical reasons for failure, should be asked to obtain professional qualification certificate of electrician maintenance, half-understood people can not blindly repair, to prevent the occurrence of personal injury accidents.