We all know that people get fever because the body's immune system is fighting fiercely against the viruses in the body. What is the reason for the fever in the water pump? Learn the knowledge today and you can be a little doctor too.

Figure | Check the operation of the pump

Before diagnosing the cause of the disease, we need to measure the temperature of the motor. We can use the electronic thermometer to the motor barrel, just "drop", you can measure the temperature, and then check the temperature range against the manual to see if the threshold value is exceeded, if the excessive heat, that is the problem.

So what are the causes of fever? Here's how to find out with me.

Figure | Data Detection

One of the reasons, possibly because the motor stator and rotor before the air gap is too small, resulting in the stator and rotor have been collision, friction, and because the rotor exists higher speed, so it leads to heat. But the two good and how will the friction? The most essential reason, or due to poor concentricity of the rotor and bearing, can be understood as the rotor is not around the center in the rotation, so the seat, end cover, rotor three in different hair axis, and eventually produce friction and heat.

Figure | Motor Rotor

Another reason may be that the dynamic balance of the rotor is not good or the quality of the bearings is not good enough, which causes the motor to vibrate unstoppably after rotation. Of course, it is also possible that when the pump base is installed, the fixed base is not flat or the fixed bolt is loose, resulting in significant vibration, which affects the normal operation of the motor, thus heating up.

Figure | Water pump bearings

There is another reason is that the overall protection ability of the pump is poor, can not waterproof and dustproof, these foreign substances through the gaps into the motor inside, so that the motor is in abnormal running state. Over time, the wear and tear increases, the resistance increases, and it will start to burn the machine. When we encounter this situation, we have to remove the motor, check the damage of the upper and lower two bearings when repairing, to do timely replacement, and other parts with hidden problems should also do a good job of maintenance.

There are many other causes of water pump burnout, so we'll leave that for another issue.