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Reasons for Large Vibration of Diesel Generator Set in Operation

Sep. 08, 2021

Diesel generator set will inevitably produce vibration when it is working, but if the vibration is too large, we must pay attention to it. Generally, there are two reasons for the excessive vibration of the unit: due to imbalance of the dynamic part, electromagnetic or mechanical failure. Next, Starlight power generation equipment introduces to users how to repair excessive vibration.


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1. The electrical part of the fault is caused by electromagnetic reasons, including: AC diesel generator set stator wiring error, wound asynchronous motor rotor winding short circuit, synchronous diesel generator set field winding short circuit, diesel generator set excitation coil connection Wrong, the rotor bar of the cage asynchronous motor is broken, and the rotor core deformation causes uneven air gap between the stator and the rotor, which leads to the unbalanced magnetic flux of the air gap and causes vibration.


2. 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 balanced separately from the rotor. Then there is the mechanical looseness of the rotating part. For example: the iron core bracket is loose, the oblique key, the pin is invalid and loose, and the rotor is not tightly bound will cause the rotating part to be unbalanced.


3. The mechanical part of the failure mainly has the following points:

(1) The shaft system of the linkage part is misaligned, the center line does not coincide, and the centering is incorrect. This kind of failure is mainly caused by poor alignment and improper installation during the installation process. There is another situation, that is, the center lines of some linkage parts coincide in the cold state, but after a period of operation, due to the deformation of the rotor fulcrum and foundation, the center line is destroyed again, and vibration occurs.

(2) The gears and couplings connected to the diesel generator set are faulty. This kind of failure is mainly manifested as poor gear engagement, serious gear tooth wear, poor lubrication of the wheel, coupling skew, misalignment, gear coupling tooth profile, incorrect tooth pitch, excessive clearance or serious wear, which will cause certain vibration.

(3) Defects in the structure of the diesel generator set and installation problems. This kind of failure is mainly manifested as the ellipse of the shaft journal, the bending of the rotating shaft, the too large or too small gap between the shaft and the bearing bush, the insufficient rigidity of the bearing seat, foundation plate, certain part of the foundation and even the entire diesel generator set installation foundation, the diesel generator set and the foundation The plates are not firmly fixed, the foot bolts are loose, and the bearing seat and the base plate are loose. The gap between the shaft and the bearing bush is too large or too small, which can not only cause vibration, but also cause abnormal lubrication and temperature of the bearing bush.

(4) The load driven by the diesel genset conducts vibration. For example, the vibration of the steam turbine of the diesel generator set by the steam turbine, and the vibration of the fan and water pump driven by the diesel generator set cause the vibration of the diesel generator set.


Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, welcome send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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