Siemens SIMOTICS S-1FK2 Configuration Manual page 85

Winding versions
Several winding versions (armature circuits) for different rated speeds n
motor frame size.
Table 6-1
①
Figure 6-2
The winding version of a motor defines the position of the natural voltage limit characteristic
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 ranges. 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).
Recommended Motor Module
For every motor, Chapter "Motor overview / Assignment Motor modules / Power cables
(Page 85)" recommends a Motor Module corresponding to its stall (starting) current.
1FK2 Synchronous Motors for SINAMICS S120
Configuration Manual, 02/2022, A5E46927724B AD
Code letter, winding version
Rated speed n in rpm
N
1500
2000
3000
4500
6000
Voltage limit characteristics
Speed-torque diagram
Technical data and characteristics
are possible within a
N
Winding version
(10th position of the Article number)
B
C
F
H
K
6.1 Explanations
①
,
83