Description, technical data
2.9 Cooling
A5E01083943A AB
34
Siemens AG Operating Instructions 2.02 1FW4
2.9
Cooling
2.9.1
Water-cooling
Description
The 1FW4 motors have two cooling circuits. Intensive, effective cooling is achieved using
these.
●
The fan inside the motor provides air circulation between DE and NDE. This cools, in
particular, the stator winding heads, the magnetic rotor and the bearings.
●
The motor housing is designed with a water-cooling system. This allows a high power
density. The coolant flows through a duct that runs in a spiral from the DE to the NDE in
the cooling jacket. The coolant inlet is on the DE, the coolant outlet is on the NDE. Seen
from the shaft end, connection is possible from the right and from the left.
Close the duct provided for cooling on the cooling circuit. The cooling duct geometry is
designed so that the stator power losses are dissipated. Forced air ventilation prevents local
temperature peaks inside the motor. This also draws off the low magnetic losses in the rotor
via the stator.
Materials used in the cooling circuit
CAUTION
Damage due to sea water
The water-cooled housing is made of St37 steel. This material is not resistant to sea water.
Ensure that the water-cooled housing does not come into contact with sea water!
NOTICE
Frost danger
If there is a danger of frost, then the appropriate anti-freeze measures are required for
operation, storage and transport. For example, emptying and blowing-out with air and anti-
freeze.
Ambient and coolant supply temperature
To prevent the formation of condensation water, the coolant supply temperature for a
stationary motor and still running cooling system must be higher than the ambient
temperature.
T
cooling
≥ T
ambient
+2°C
Summary of Contents for 1FW4
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