Synchronous Motors 1FK7
Configuration Manual, (PFK7S), Edition 12.2006, 6SN1197-0AD16-0BP1
39
Electrical data
4
4.1 Torque-speed characteristic
The permissible operating range is limited by thermal, mechanical, and electromagnetic
boundaries.
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Figure 4-1 Torque characteristics of synchronous motors
Permissible temperature range, 100 K-, 60 K-values
The temperature rise of the motor is caused by the losses generated in the motor
(current-dependent losses, no-load losses, friction losses). It is dependent on the cooling
method (self-cooled, forced ventilation, water-cooled).
155 °C corresponds to a utilization according to temperature class F.
1FK7 motors can be operated up to an average winding temperature of 140 °C.
A maximum permissible ambient temperature of 40 °C for self-cooled motors generally
applies to all specifications.
100 K or 60 K is the average winding temperature rise in Kelvin.
60 K lies in the utilization within temperature Class B. The 60 K utilization is used:
• if the temperature of the enclosure/housing must lie below 90 °C for safety reasons
• or the shaft temperature rise would have a negative impact on the mounted machine
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