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Surface cooling by relative movement of cooling air: Cooling method IC 418 according to
EN / IEC 60034-6
IC418 IC4A1A8
Figure 4-2
4.3.4
Bearings of synchronous machines
In order to support the machine shaft and maintain its position in the non-moving part of the
machine, only 2 rolling bearings are used. One rolling bearing performs the function of a
location bearing that transfers axial and radial forces from the rotating machine shaft to the non-
moving part of the machine. The second rolling bearing is implemented as a floating and
support bearing in order to allow thermal expansion inside the machine and transfer radial
forces.
The nominal (theoretical) service life of the bearings according to ISO 281 is at least 20,000
hours when the permissible radial/axial forces are utilized. However, the achievable useful life
of the bearings can be significantly longer in the case of lower forces (e.g. operation with
self-aligning couplings). Avoid rigid couplings.
Rolling bearings with permanent lubrication are maintenance-free.
4.3.5
Balancing
As standard, the machine is designed with vibration severity level A. The rotor is dynamically
balanced with a half feather key (code "H").
Vibration severity level B can be ordered as option, and stamped on the rating plate.
4.3.6
Types of construction/method of installation
The type of construction of the machine is stated on the rating plate.
1FU9
Operating Instructions, 10/2023, A5E46712792A
IC418
Description
4.3 Installation
35
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