GenSet
Figure 1: GenSet
A GenSet is a joined unit with a diesel engine, an
alternator and a common base frame. The alterna-
tor has a stator housing with a front flange which is
connected to the diesel engine with bolts. Similar to
this the alternator has foot flanges with bolt connec-
tion to the base frame. The base frame is anchored
to the foundation with a variable number of rubber
dampers.
Mechanical alternator design
The rotor in the alternator is installed with either one
or two bearings. On one-bearing alternators the
rotor is connected to the flywheel of the diesel
engine with a flex disc. The one-bearing alternator
does not have a front bearing and in this case the
rotor is carried by the crankshaft of the engine. On
two-bearing alternators the connection is a flexible
rubber coupling, and the rotor front is seated in the
stator housing of the alternator.
In both cases the alternator stator housing is con-
nected to the diesel engine with bolts, however,
with two-bearing alternators an intermediate piece
with bolt flanges is used which at the same time is
shielding the flexible rubber coupling.
The bearing type can be ball bearing, roller bearing
or sleeve bearing.
The engine types 8L21/31, 9L21/31, 8L27/38
and 9L27/38 only use two-bearing alternators to
keep the load on the engine’s rear crankshaft
bearing on a low level.
The alternator can be delivered air-cooled with insu-
lation class IP23 or water-cooled with insulation
class IP44.
MAN Diesel & Turbo
1699895-2.1
Page 1 (2)
Alternators for GenSets
B 50 00 0
L27/38S, L21/31S, L16/24S, L16/24, L21/31, L27/38
2015.11.27
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