What causes the heating phenomenon of the three-phase asynchronous motor? The knowledge here is too great. Today, Dalan Motor manufacturers will give you an in-depth analysis of the cause of motor heating and teach you how to prevent it.
1. The air gap between the stator and rotor of the motor is very small, which is easy to cause the collision between the stator and rotor
If the air gap is too small, the rotor may have friction or collision, which can easily cause the motor to heat up or even burn. If it is found that the bearing is worn, it should be replaced in time, and the end cover should be replaced or brushed. The simpler method is to insert the end cover.
Second, the abnormal vibration or noise of the motor is likely to cause heating of the motor
This situation belongs to the vibration caused by the motor itself, most of which is due to the poor dynamic balance of the rotor, poor bearings, bending of the rotating shaft, different shaft centers of the end cover, machine base, and rotor, loose fasteners or uneven installation of the motor, and the installation is not in place. Caused by, should be ruled out for specific circumstances.
3. The abnormal working of the bearing will definitely cause the motor to heat up.
Check the bearing end to determine whether its temperature is within the normal range. If you hear the impact sound, it means that there may be one or several balls crushed. If you hear a hissing sound, it means that the bearing has insufficient lubricating oil and needs to be replaced. fat.
Fourth, the power supply voltage is too high, the excitation current increases, the motor will overheat
When the three-phase voltage is asymmetric, that is, when the voltage of one phase is too high or too low, it will cause the current of a certain phase to be too large, and the three-phase asynchronous motor will heat up. Damage to the winding.
5. Short circuit of winding, short circuit between turns, short circuit between phases and open circuit of winding
Either way, it will increase the current of one or two phases of the three-phase asynchronous motor, causing local heating, and aging the insulation to damage the three-phase asynchronous motor. Therefore, after this happens, you must immediately stop processing.
Sixth, the material leaks into the interior of the motor, which reduces the insulation of the motor, thereby allowing the temperature rise of the motor to be reduced
Solid materials or dust enter the inside of the motor from the junction box, which damages or scraps the motor. If the liquid and gas medium leak into the motor, it will directly cause the motor insulation to drop and trip.
7. Almost half of the motor burns are caused by the lack of phase operation of the motor
The lack of phase often causes the motor to fail to run or the speed is slow after starting, or the powerless current increases and there is a "buzzing" sound phenomenon.
8. Other causes of non-mechanical electrical faults
In short, familiar with the common faults of three-phase asynchronous motors is the first condition for correct fault handling. Only when we are familiar with the characteristics and causes of its faults can we save time and eliminate the faults in a targeted manner to ensure the normal operation of the motor.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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