1FT7 Synchronous Motors
Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
71
Technical data and characteristic curves
4
4.1 Operating range and characteristics
Permissible operating range
The permissible operating range is limited by thermal, mechanical, and electromagnetic
boundaries. The data in this documentation are measured at the following temperatures:
● For naturally cooled motors: max. 40 °C ambient temperature
● For water-cooled motors: max. 30 °C coolant inlet temperature
The temperature rise of the motor is caused by the losses generated in the motor (current-
dependent losses, no-load losses, friction losses). The utilization of the motor depends on
the cooling method (self-cooled, forced ventilation, water-cooled). To adhere to the
temperature limits, the torque must be reduced as the speed increases, starting from static
torque M
0
.
Permissible temperature range, characteristics S1
(100 K)
and S1
(60 K)
1FT7 Compact motors can be operated up to an average winding temperature of 145° C.
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0
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Figure 4-1 Torque characteristics of synchronous motors
For continuous operation, the limits of this permissible temperature range are represented by
the S1 characteristic identified as 100 K. This corresponds to utilization according to
temperature class 155 (F).
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