Siemens SIMOTICS T-1FW68, Configuration Manual

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Configuring
5.1 Configuring workflow
1FW68 radial segment motors
92
Configuration Manual, 08/2021, A5E51132930B AA
Determining the motor torque-speed diagram
If the motor torque-speed diagram is not available, then determine the motor torque-
speed diagram from the following data taken from the "Motor torque speed diagram"
figure.
• Maximum torque M
MAX
with the associated speed n
MAX,MMAX
• Rated torque M
N
with the associated speed n
N
In this diagram, transfer all operating points of the duty cycle from the motor torque-time
diagram and the speed-time diagram. Generally, you only have to search for critical
points in time in the torque-time diagram. Critical points in time are when the maximum
speed exceeds the n
MAX,MMAX
at peak torque.
For these points in time, determine the motor torque (in the example M
1
) from the motor
torque-time diagram. Check whether the motor torque lies below the characteristic in
the motor torque-speed diagram.
Figure 5-6 Motor torque-time diagram and associated speed-time diagram