How to Prevent Submersible Pump Motor from Burnout

Motor is one of the main power equipment, while the submersible pump motor burn is common. To avoid the motor burned in operation, in addition to running before the necessary technical protection measures to protect the outside, the following "six strokes" the most effective.
1 Always keep the motor clean
In the operation of the motor, at least 3m around the inlet is not allowed to dust, water stains and other debris to prevent the suction motor internal, the formation of short-circuit medium, or damage the wire insulation, resulting in short circuit current increases, the temperature rise Burn the motor. Therefore, to ensure that the motor has sufficient insulation resistance, as well as a good ventilation cooling environment in order to make the motor in a long time to maintain safe and stable operation of the state.
2 Keep the motor operating at rated current
Motor overload operation, the main reason is due to drag the load is too large, the voltage is too low, or driven by mechanical stuck caused. If the overload time is too long, the motor will absorb a large number of active power from the power grid, the current will increase sharply, the temperature will rise, the motor insulation will burn aging failure. Therefore, the motor is running, pay attention to always check whether the transmission is running flexible and reliable; concentricity is the standard coupling; gear transmission flexibility and so on. If you find a lag card phenomenon, should immediately stop the machine to find out the reasons for troubleshooting and then run.
3 Always check the motor three-phase current balance
Three-phase asynchronous motor, the three-phase current of any one phase current and the other two current average difference does not allow more than 10%, so as to ensure the safe operation of the motor. If more than that the motor is faulty, must be identified.
4 Check the temperature of the motor Always check the motor bearing, stator, shell and other parts of the temperature with or without abnormal changes
Especially for the no voltage, current and frequency monitoring and no overload protection of the motor, the temperature monitoring is more important. Motor bearings are overheating, lack of oil, if found near the bearing temperature is too high, it should immediately stop inspection. Bearing the rolling body, raceway surface with or without cracks, scratches or missing missing, bearing clearance is too large shaking, the inner ring on the shaft with or without rotation and so on. Any of the above-mentioned phenomena. Must be renewed bearing before re-operation.
5 observe whether the motor vibration, noise and abnormal smell
If the motor vibration occurs, it will cause the load part of the load connected with increased heart rate, the formation of motor load increases, overload operation, it will burn the motor. Therefore, the motor is running, especially the high-power motor should always check the anchor bolts, motor cover, bearing glands are loose, grounding device is reliable and found a timely manner to solve the problem. Sound and smell of the noise field is abnormal motor operation, then a serious precursor to failure, you must always find and identify the cause of surface excluded.
6 Ensure that the startup device is working properly
The technical state of the motor starting equipment plays a decisive role in the normal starting of the motor. Practice has proved that the vast majority of burned motor, the reason most of the starting equipment is not working properly caused. Such as starting the device phase start, contactor contacts arc, ignition and so on. The maintenance of the starting equipment is mainly cleaning, fastening, such as the contactor contact is not clean contact resistance will increase, causing fever to burn contacts, resulting in phase loss and burn the motor; contactor coil suction core corrosion and dust Product, will make the coil lax, and a strong noise, increasing coil current, burned coil and cause failure.
Therefore, the electrical control cabinet should be located in dry, ventilated and easy to operate position, and regularly dust. Always check the contactor contacts, coil core, the wiring screws are reliable, mechanical parts of the action is flexible, to maintain a good state of technology, so as to ensure smooth start without burning the motor.