Siemens TV Converter Box 611 User Manual

Configuring the motor

5.1 Procedure

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).

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

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

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

Configuration Manual, 05/2009, 6SN1197-0AD00-0BP7