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

Mechanical properties

4.1

Cooling

The water cooling dissipates the stator winding power loss.
• 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 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 rotor power loss is specified in the "Technical data and characteristics" chapter in the
"Rotor power loss with respect to speed" characteristics.
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.
• Ensure that the rotor does not exceed the maximum temperature of 120 °C.
Note
Thermal expansion of the motor
Depending on the load and duty type, the average temperature in the stator and rotor can reach
120°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 when the designing the machine.
1FW6 Built-in torque motors
Configuration Manual, 09/2022, A5E52220645B AA
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