This article will guide you to learn about the reasons and solutions for diesel genset vibration. If you are interested, keep reading.
The structure of diesel generator contains both electrical and mechanical parts, which can also be said
to be a combination of mechanical and electrical. Therefore, its failure is
divided into two analysis. The cause of the vibration fault of the generator is
also divided into two parts. In general, generator vibration is caused
unbalanced, electromagnetic or mechanical failure of the rotating part.
1. The unbalance of the
rotating part is mainly caused by the imbalance of the rotor, the coupler, the
coupling, and the transmission wheel (brake wheel). the treatment method is to
find the rotor balance first. If there are large drive wheels, brake wheels,
couplers, and couplings, separate the balance from the rotor. If there are
large transmission wheels, brake wheels, couplings, separate and separate from
the rotor to find a good balance. Then there is the mechanical looseness of the
rotating part. For example, the iron core bracket is loose, the oblique key and
the pin are loose, and the rotor is not tied tightly, which will cause the
rotating part to be unbalanced.
The
main problems of mechanical parts are as follows:
1. The linkage part of
the shaft system is misaligned, the center line does no coincide, and the
centering is incorrect. The cause of this failure is mainly caused by poor alignment
and improper installation during the installation process. There is also a case
where some of the center lines of the interlocking parts are coincident in the
cold state, but after a period of operation, the center line is broken due to
the deformation of the rotor fulcrum and the foundation, thereby generating
vibration.
2. Gears and couplings
associated with generators are faulty. This kind of failure mainly manifests as
poor gear occlusion, serious tooth wear, poor lubrication of the wheel, skewing
and misalignment of the coupling, tooth profiles of the gear coupling,
incorrect tooth pitch, excessive clearance or serious wear, which will cause
certain vibration.
3. The load dragged by
the generator conducts vibration. For example, the turbine vibration of a steam
turbine generator, the fan driven by then motor, and the vibration of the water
pump cause vibration of the motor.
4. Defects in the
structure of the generator itself and installation problems. This kind of
failure mainly manifests as the ellipse of the journal, the bending of the
shaft, the gap between the shaft and the bearing bush is too large or too
small, and the rigidity of the bearing seat, the foundation plate, a part of
the foundation and even the entire generator installation foundation
insufficient, and generator and the base plate are insufficient. The fixing is
not strong, the foot bolts are loose, and the bearing seat and the base plate are
loose. The excessive or too small gap between the shaft and the bearing bush
can not only cause vibration but also cause abnormal lubrication and
temperature of the bearing bush.
The
failure of the electrical part is caused by electromagnetic causes
1. Mainly include
short-circuit of rotor winding of winding type asynchronous motor, stator
wiring error of AC motor, turn-to-turn short circuit of synchronous motor
excitation winding, misalignment of excitation coil of synchronous motor, rotor
broken strip of cage asynchronous motor, rotor core deformation caused by
stator and rotor air gap unevenness causes the air gap flux to be unbalanced
and cause abnormal vibration.
When using the diesel
generator set, the user will encounter abnormal noise and excessive vibration
during the operation of the diesel engine. The following is the answer to the
reasons and troubleshooting methods of diesel generator vibration.
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