Technical data and characteristics
6.1 Explanations
1FT2 synchronous motors for SINAMICS S120
Configuration Manual, 03/2021, A5E50645584B AA
73
Winding versions
Several winding versions (armature circuits) for different rated speeds nN are possible within
a motor frame size.
Table 6- 1 Code letter, winding version
Rated speed n
N in r/min Winding version
(10th position of the Article number)
Voltage limit characteristics
Figure 6-2 Speed-torque diagram
The winding version of a motor defines the position of the natural voltage limit characteristic
①, and therefore defines the operating range limit.
Motors with a higher code letter for the winding permit a wider speed range in the S1 and
overload operation. However, these motors require a higher current for the same torque.
The preferred choice is the motor with the lowest code letter for the winding, which still
addresses the speed requirements for the application.
This is how you optimize the output current required, and therefore the converter size
(rating).
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