Ten reasons for motor vibration
1. The rotor, coupler, coupling, and transmission wheel (brake wheel) are not balanced.
2. The iron core bracket is loose, the oblique key and the pin are loose, and the rotor is not tied tightly, which will cause the rotating part to be unbalanced.
3. The linkage part of the shaft system is misaligned, the center line does not coincide, and the centering is not correct. The cause of this failure is mainly caused by poor alignment and improper installation during the installation process.
4. The center line of the linkage part is coincident in the cold state, but after running for a period of time, the center line is destroyed due to deformation of the rotor fulcrum and foundation, and vibration is generated.
5. The gears and couplings connected to the motor are faulty, the gears are poorly engaged, the gear teeth are seriously worn, the wheel is poorly lubricated, the coupling is skewed, misaligned, the toothed coupling is toothed, the pitch is wrong, and the clearance is too Large or worn, it will cause a certain amount of vibration.
6. Defects in the structure of the motor itself, the ellipse of the journal is elliptical, the shaft is bent, the gap between the shaft and the bearing bush is too large or too small, and the rigidity of the bearing seat, the foundation plate, a part of the foundation and even the entire motor mounting base is insufficient.
7. Installation problems, the motor and the base plate are not firmly fixed, the foot bolts are loose, and the bearing seat and the base plate are loose.
8. Excessive or too small clearance between the shaft and the bearing bush can not only cause vibration but also cause abnormal lubrication and temperature of the bearing bush.
9. The load transmitted by the motor is transmitted, such as the fan driven by the motor and the vibration of the pump, causing the motor to vibrate.
10. AC motor stator wiring error, winding-type asynchronous motor rotor winding short circuit, synchronous motor excitation winding turn-to-turn short circuit, synchronous motor excitation coil connection error, cage asynchronous motor rotor broken strip, rotor core deformation caused by stator and rotor air gap Both cause the air gap flux to be unbalanced and cause vibration.
