Siemens SIMOTICS-T 1FW68 Engineering Manual page 120

Technical data and characteristics
6.1 Explanations
Torque-speed diagram with field weakening
1 S1 duty
2 S1 duty with field weakening
3 Voltage limit characteristic
4 Limit characteristic for S1 duty
5 Voltage limit characteristic with field weakening
6 Rated operating point at M
7 Operating point at M
8 Torque M at speed n = 1 rpm
0
Figure 6-4 Schematic description of the torque-speed diagram
The voltage induced in the motor winding increases as the speed increases. The difference
between the DC link voltage of the converter and the induced motor voltage can be used to
impress the current.
The torque must be reduced if the voltage limit of the infeed module is reached at speed n.
All operating points that can be achieved with the motor lie below the "voltage limiting
characteristic".
120
, n , I
N N N
, I , n
MAX MAX MAX,MMAX
1FW68 radial segment motors
Configuration Manual, 04/2017, 6SN1197-0AE02-0BP1