Siemens SIMOTICS L-1FN3 Configuration Manual page 62

Mechanical properties
3.1 Cooling
Details of the heat dissipation
The following figure shows details of the heat dissipation according to the
Thermo-Sandwich® principle.
Figure 3-1
Primary section main cooler / cooling of the primary section
The primary section main cooler is directly installed in the primary section. Under rated
conditions, the primary section main cooler dissipates 85% to 90% of the power loss arising
in the primary section.
The primary section main cooler has no influence on the thermal insulation of the motor from
the machine.
Primary section precision cooler / thermal insulation of the primary section
Under rated conditions, the primary section precision cooler dissipates 2% to 10% of the
total power loss from the primary section. This keeps the temperature rise of the outer
surface of the primary section precision cooler over the flow temperature of the primary
section precision cooler within a small range of fluctuation. Together with the secondary
section cooling, the primary section precision cooler reduces the heat transmission into the
connection structure.
The air gap insulates the primary section from the secondary section. On the bolting surface,
the optional primary section precision cooler shields the surrounding area from excessively
high motor temperatures. Thermo-insulators on the screwed connections and the air
chamber located in between reduce heat transfer from the primary section.
The lateral radiation panels of the primary section precision cooler also form air filled spaces.
These radiation panels insulate the primary section from the machine structure at the sides.
Under rated conditions, the temperature rise of the outer surface of the primary section
precision cooler over the flow temperature is no more than 4 K.
60
Heat dissipation from motors of the 1FN3 product family
Configuration Manual, 10/2018, 6SN1197-0AB86-0BP2
1FN3 linear motors