1, is the composition of the pump accessories are not qualified. The air gap between the stator and rotor of the motor is very small, and there is a collision. The concentricity of the bearing is poor, so that the different axis of the frame, the end cover and the rotor cause the cleaning of the bore, and thus heat.
2. Excessive vibration for various reasons. The rotor dynamic balance is poor, the bearing is poor, the overall structure is poor. Of course, it may also be that the basic work is not done well, and the installation of the base is not properly fastened.
3, dust or other substances intervene in the body, such as the junction box sealing is not good, the gap is too large. The intervening material causes the bearing and rotor to wear and tear, so preventing foreign access is extremely important.
