Excessive vibration during operation of three-phase asynchronous motor

Possible causes of malfunction:
Excessive clearance of bearings due to wear and tear;
Uneven air gap affects the balance of the motor;
Unbalanced rotor leads to vibration;
The bending deformation of the shaft affects the operation of the motor;
Iron core deformation or looseness, affecting the stability of the motor;
The center of the coupling (or pulley) is not aligned, causing vibration;
Unbalanced fan, exacerbating vibration;
Insufficient strength of the casing or foundation to effectively support the motor;
Loose anchor screws affect the fixing of the motor;
Cage rotor welding or breaking, winding rotor breaking, and stator winding failure.

Troubleshooting methods:
Inspect and replace bearings as necessary to ensure proper clearance;
Adjust the air gap to make it evenly distributed;
Perform dynamic balance correction on the rotor to ensure balance;
Straighten the shaft and eliminate bending deformation;
Correct overlapping iron cores to ensure their stability;
Re calibrate the center of the coupling (or pulley) to comply with regulations;
Inspect and balance the fan, correct its geometric shape;
Reinforce the casing or foundation;
Tighten the foot screws to ensure that the motor is firmly fixed;
Repair the faults in the rotor winding and stator winding.