Mechanical Properties; Cooling - Siemens Simotics T-1FW6 Configuration Manual

Mechanical properties

3.1

Cooling

A water-cooling system dissipates the heat loss generated by the stator winding.
• Connect the cooling ducts to the cooling circuit of a cooling device.
You can find characteristic curves for the pressure drop of the coolant between the flow and
return circuit of the coolers as a function of the volume flow rate in Chapter "Technical data
and characteristics".
In certain operating states, you must expect an additional temperature rise of the rotor as a
result of iron losses, e.g. when operating at high speeds or in S1 mode.
The rated motor torques specified in the data sheets of Chapter "Technical data and
characteristics" apply under the following conditions:
• Operation with water cooling with a water intake temperature of 35 °C.
• Rotor flange temperature of the rotor mounting surface 60 °C.
To comply with these conditions, it may be necessary to take additional measures to cool the
rotor.
NOTICE
Demagnetization of the rotor magnets
If the heat from the rotor is not sufficiently dissipated via the flange, the rotors can heat up
excessively in the upper speed range in duty type S1. which could demagnetize the
magnets.
•
Note
Thermal expansion of the motor
Depending on the load and duty type, the average temperature in the stator and rotor can
reach 70 °C. Temperature changes in the stator and rotor can cause the motor components
to expand.
• You must take into account the amount of heat transferred into the machine construction
as well as the radial and axial thermal expansion of the motor.
1FW6 external rotor built-in torque motors
Configuration Manual, 12/2020, A5E50516483B AA
Ensure that the rotor does not exceed the maximum temperature of 70 °C.
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