Configuring the motor 5.1 Procedure

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If the individual torques are stable in each section, the integral can be simplified to create a totals formula (see also the following diagram).

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Figure 5-3 Motor torque-time diagram

5.1.4Selecting the motors

You can choose a suitable torque motor using the values determined for the peak torque MmMAX and continuous torque Meff.

You must take the following factors into account when selecting motors:

Regarding the maximum torque MMAX, the motor should have a control reserve of approx. 10% vis-à-vis the required value MmMAX to prevent unwanted limiting effects if the control loops are overshot.

The rated motor torque MN must be at least as high as the continuous torque value Meff 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.

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1FW6 Built-in torque motors

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

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Siemens 611 configurationmanual Selecting the motors, Motor torque-time diagram