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The abnormal vibration failure analysis of diesel generator is as follows

发表时间:2017-12-05 Article source : Couch motor manufacturersPost time: 2017-12-05

After the diesel generator starts successfully, abnormal vibration and irregular vibration occur. It is necessary to stop the inspection, find out the source of the vibration, and solve the problem. Today the diesel generator manufacturer analyzes and analyzes with everyone! The main reason for the imbalance of the rotor is the rotor, Imbalance of connecting rods, couplings and drive wheels (brake wheels). The solution to this problem is to find the right balance point. If there are larger drive wheels, brake wheels, couplings and couplings, It should be separated from the rotor separately.

Then there is the mechanically loose rotating part. For example, the iron core bracket is loose, the oblique key, the pin is loose, and the rotor binding will cause the rotating part to be unbalanced.
Part of the reason for the mechanical failure is that the connecting rod part of the shaft is asymmetric, the centerline is not coincident, and the centering is incorrect. The main cause of this failure is improper installation and improper installation. In addition, the centerline of some interconnected components is In the cold state, it is exactly the same, but after a period of operation, the centerline is damaged due to deformation of the rotor support, foundation, etc., resulting in vibration.
The gear and the connection to the generator are defective. This failure is mainly manifested in gears, worn tooth surfaces, poor lubrication, skewed and misaligned wheels and couplings, gear teeth, toothed couplings, excessive clearance, or wear Serious, it will cause some vibration.
Defects and installation problems of the generator itself. This kind of failure is mainly due to ellipse, shaft bending, too large or too small gap between shaft and bearing, bearing, base, and part of the rigidity of the entire motor installation foundation. Between the bases that are not firmly fixed, the anchor bolts are loose, the bearing housing and the base plate are loose, the vibration between the isoshaft and the shaft is too large or too small, and the lubrication and temperature of the bearing are abnormal.
The load of the generator is transmitting vibration. For example: the turbine vibration of the turbine generator, the motor dragging the fan, and the pump vibration, causing the motor to vibrate.
The failure of the electrical part is caused by electromagnetic mainly including: incorrect wiring of the stator of the AC motor, short circuit of the rotor windings of the generator motor, short circuit between the windings of the synchronous motor excitation winding, incorrect connection of the excitation coil of the synchronous motor, broken rotor bars of the motor, and uneven air gaps , Causing the rotor core to deform, resulting in air gap magnetic flux imbalance caused by vibration.

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