Today, we will briefly introduce to you what are the common vibration faults of Volvo generators. Generally speaking, generator vibrations are caused by unbalanced rotating parts, mechanical failures or electromagnetic aspects.
First, the unbalance of the rotating part is mainly caused by the unbalance of the rotor, coupler, coupling and transmission wheel (brake wheel). The solution is to find the rotor balance first. If there are large transmission wheels, brake wheels, couplers, and couplings, they should be separated from the rotor to find a good balance. Then there is the mechanical loosening of the rotating part. For example, the looseness of the iron core bracket, the failure of the oblique key and the pin, and the loose binding of the rotor will cause the unbalance of the rotating part.
Second, the failure of the mechanical part mainly includes the following points:
1. The shaft system of the linkage part is not centered, the center lines are not coincident, and the centering is incorrect. The cause of this failure is mainly caused by poor alignment and improper installation during the installation process. Another situation is that the center lines of some linkage parts coincide in the cold state, but after running for a period of time, due to the deformation of the rotor fulcrum and the foundation, the center line is damaged again, resulting in vibration.
2. The gears and couplings connected to the Volvo generator are faulty. This kind of failure is mainly manifested in poor gear engagement, serious gear tooth wear, poor lubrication of the wheel, skew and misalignment of the coupling, incorrect tooth shape and pitch of the toothed coupling, excessive clearance or serious wear, which will cause certain damage vibration.
3. The structural defects and installation problems of the Volvo generator itself. This kind of fault is mainly manifested as ellipse journal, bending shaft, too large or too small gap between shaft and bearing bush, insufficient rigidity of bearing seat, foundation plate, part of foundation and even the entire generator installation foundation, and the gap between generator and foundation plate is not enough. The fixing is not firm, the foot bolts are loose, the bearing seat and the base plate are loose, etc. Excessive or too small clearance between the shaft and the bearing bush can not only cause vibration, but also make the lubrication and temperature of the bearing bush abnormal.
4. The load driven by the Volvo generator conducts vibration. For example: the vibration of the steam turbine of the steam turbine generator, the vibration of the fan and the water pump driven by the motor, cause the vibration of the motor.
Third, the failure of the electrical part is caused by electromagnetic reasons.
Mainly include: AC motor stator wiring error, wound asynchronous motor rotor winding short circuit, synchronous motor excitation winding inter-turn short circuit, synchronous motor excitation coil connection error, cage asynchronous motor rotor broken, rotor core deformation caused by stator and rotor air gap Uneven, resulting in unbalanced air gap flux and resulting in vibration.
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