User's Manual

Configuring the motor
5.1 Procedure
0
HII
If the individual torques are stable in each section, the integral can be simplified to create a
totals formula (see also the following diagram).
0
HII
0
HII
Figure 5-3 Motor torque-time diagram
5.1.4 Selecting the motors
You can choose a suitable torque motor using the values determined for the peak torque
M
mMAX
and continuous torque M
eff
.
You must take the following factors into account when selecting motors:
● Regarding the maximum torque M
MAX
, the motor should have a control reserve of approx.
10% vis-à-vis the required value M
mMAX
to prevent unwanted limiting effects if the control
loops are overshot.
● The rated motor torque M
N
must be at least as high as the continuous torque value M
eff
determined for the duty cycle.
● If certain general conditions (e.g. machining torque or frictional torque) are not known,
you are advised to plan for even larger reserves.
● In addition to the requirements resulting from the duty cycle, mechanical installation
conditions may influence your choice of motor. For instance, the same motor torque can
often be generated in a long motor with a smaller diameter as well as in a short motor
with a larger diameter.
● If more than one torque motor generates torque on one axes, the values of the peak and
continuous torques of the individual motors must be added together.
1FW6 Built-in torque motors
66 Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3