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Technical data and characteristic curves
6.1
Explanations
Permissible operating range
The permissible operating range is limited by thermal, mechanical, and electromagnetic
boundaries. The data in this documentation apply to the following temperatures:
● For naturally cooled motors: up to 40 °C ambient temperature
● For water-cooled motors: up to 30 °C coolant inlet temperature
The motor heats up due to the losses generated in the motor (current-dependent losses, no-
load losses, friction losses).
The utilization of the motor depends on the cooling method (naturally cooled, forced
ventilation, liquid-cooled).
To maintain the temperature limits, the permissible torque – starting from static torque M0 –
decreases as the speed increases.
The characteristics below show the limits of the permissible temperature range.
M
Figure 6-1
S-1FT7 synchronous motors
Configuration Manual, 09/2018, A5E45099423B AA
Voltage limit characteristic without field weakening
Volt lim
1
Voltage limit characteristic with field weakening
A
Without field weakening
B
Field weakening range
Torque characteristics of synchronous motors
6
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