Relative movement of shaft and rotor

The rotor iron core and the shaft are in interference cooperation. If there is a gap between the iron core hole and the motor shaft iron core for some reason, the axial and radial relative orientation changes between the rotor iron core and the shaft, which are manifested as channeling. In addition to the shaft problem, it is likely that the end cover and the rotor end will be rubbed and deformed due to the axial movement of the rotor core, which will affect the stator winding in severe cases.

Axial conditioning spring gasket damaged or missing

During the design of the whole machine, the thermal expansion factor of the motor material will be considered, leaving a certain gap in the axial direction. At the same time, in order to avoid the hard contact and de-contact during the axial displacement process, the method of adding a spring washer is selected. If there is a problem with the quality of the spring washer, it will cause the axial stop to fail, which is directly manifested as a channeling shaft.

Movement caused by the self-alignment adjustment of the magnetic centerline of the stator and rotor of the motor

The ideal state of the motor is that the stator and rotor magnetic center lines coincide, but in practice it is difficult to complete the axial alignment of the stator and rotor. For this reason, during the operation of the motor, there will be continuous alignment→offset→alignment→offset → The self-aligning adjustment process of ..., especially the situation of the radial ventilation channel iron core, the deflection of the iron core, the horseshoe and other problems, the repeated adjustment process is more serious, which causes the axial movement.

Axial force that occurs when the fan rotates

Regarding the motor with its own propeller fan or axial flow fan, during the operation of the motor, the ventilation process will generate a corresponding axial force on the motor; if the static balance of the fan itself is not good, or the fan is damaged, it will also lead to the motor shaft. moving in the direction.

Playing due to loose cooperation of end cover bearing chamber

In the case of large axial impact, the cooperation between the end cover bearing chamber and the bearing is more sensitive, especially the problem of small standard motors with sealed bearings is more serious. In order to avoid the occurrence of this problem, the end cover should be added Snap ring for hole.