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How To Deal With Large Vibration In Diesel Generator Set Operation

Jun. 29, 2022

After the unit is started, when the AC synchronous generator is in the no-load state, when the axial and lateral vibration values exceed the specified values, it means that the generator vibrates greatly during operation. In order to make the maintenance personnel of the diesel generator set more convenient and quick to find the fault point, the following contents will be explained in detail for you.


①The rotor is mechanically unbalanced, mainly because the dynamic balance is not calibrated or the accuracy of the dynamic balance does not meet the requirements.


② The rotor bearing of the engine is worn, so that the unevenness of the air gap between the stator and the rotor exceeds 10%, and the unilateral magnetic pulling force is large, which causes the vibration of the synchronous generator.


③ Poor bearing accuracy is one of the strong vibration sources of high-speed generators. The main manifestations are the radial deflection of the bearing inner ring or outer ring, the ovality of the ring, the excessive clearance in the cage, and the waviness or local surface defects of the raceway surface.


④ The quality of the device between the bearing and the shaft or the end cover is poor.


⑤ The bearing is too tight with the shaft or end cover.


⑥ The bearing is installed by tapping method, and the process is incorrect.


⑦ The grade of grease used in the bearing is wrong.


diesel generator set

Corresponding processing method:


①The rotor of each generator must be corrected for dynamic balance, and the dynamic balance accuracy specified in the drawing must be overthrown.


② Select bearings with qualified precision according to the grades specified in the drawings. Check the unevenness of the stator and rotor air gaps, and adjust the assembly until the unevenness meets the requirements.


③ Install the bearing, the shaft and the end cover according to the specified matching accuracy.


④ Bearing installation is strictly prohibited by the percussion method, it is best to use the heat sleeve method of heating the bearing in the oven.


⑤ The grease must be selected according to the grade specified in the drawing.


The above are the reasons for the large vibration of generators and the treatment methods analyzed by Jiangsu Starlight Electricity Equipments Co.,Ltd.


Jiangsu Starlight Electricity Equipments Co.,Ltd. is one of the earliest manufacturers of generators and diesel generator sets in China. The company was established in 1974 and the company occupies an area. With an area of 86,000 square meters and a building area of 45,000 square meters, it has 64 sales and service departments across the country to provide users with one-stop service of design, supply, debugging and maintenance at any time. Welcome customers to come to consult and visit. Looking forward to your inquiry, please send email to us for details sales@dieselgeneratortech.com.

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