Vibration Fault common introduction of diesel generator sets

Day a customer asked my generator set on the fourth floor on it? This is certainly to die, diesel generator set must be in contact with the ground. The structure of the diesel generator set contains both electrical and mechanical parts, can also be said to be a combination of electrical and mechanical point. So, to its failure the analysis. The vibrations cause of the failure of the diesel generator sets should be divided into two parts.
Generally speaking, the diesel generator set vibration is due to the rotating part of the imbalance, the cause of the mechanical failure or electromagnetic.
1. The rotating parts imbalance main rotor, coupler, couplings, drive wheel (brake wheel) imbalance caused.

The approach is to first find improved sub-balance. If you have a large drive wheel, brake wheels, couplers, couplings, should be separated from the rotor alone to find a good balance. Then there is the rotating part of the mechanical loosening caused. The: core bracket loose, the ramp keys, pin lapse loose rotor banding not tight can cause rotating parts imbalance.

2. The mechanical part of the fault mainly the following:

(1), the linkage part of the shafting misalignment do not coincide, the centerline, incorrect centering. The main reasons of this fault in the installation process, misalignment, improper installation. There is a situation that is some linkage part of the center line in the cold state coincides, but after a period of operation due to deformation of the rotor fulcrum, based centerline has been destroyed, and the resulting vibration.
(2), associated with diesel generator set, gears, couplings faulty. This failure mainly to gear malocclusion, severe tooth wear, poor lubrication of wheel coupling skew, dislocation, gear coupling toothed, pitch wrong, the gap is too large or badly worn, will have a certain vibration.
(3), the structural defects of the diesel generator sets and installation problems. This failure mainly journal oval shaft bending, shaft and bearing gap is too large or too small, bearing seat, base plate, a part of the foundation and the whole diesel generator sets installed base is not enough stiffness, diesel generator set and basic fixed is not strong among the board, foot loose bolts, loose between the bearing base plate. Between the shaft and the bush, the gap is too large or too small can not only cause the vibration also allows the pad lubrication and temperature to produce abnormal.
(4), diesel generator set drag the load transmitted vibration. For example: the steamship diesel generator sets, steam turbine vibration, drag the fan of the diesel generator set, water pump vibration, caused by the vibration of the diesel generator sets.

3. The electrical part of the failure is caused by the electromagnetic reasons

Include: AC diesel generator set the stator wiring error, Wound induction motor rotor windings short circuit, synchronous diesel generator set Reed windings of a short circuit, synchronous diesel generator excitation coil connection error, cage induction motor broken rotor bars, rotor core deformation caused by the stator and rotor air gap uneven, leading to the air-gap flux imbalance resulting vibration.
Diesel generator set vibration a variety of reasons, the above is only the author of the work, the actual encounter some fault summarize above.

PREV article：Diesel generator set engine fasteners nine assembly problem

NEXT article：Perkins generator gas system