Siemens S120 configurationmanual Selecting an infeed unit, Configuring the motor 5.2 Examples

Configuring the motor 5.2 Example(s)

The speed n in rpm can be converted to the angular velocity as follows:

Example: converting the speed n = 80 rpm to the angular velocity ω

The value for the rated temperature of the motor winding must be applied for the phase resistance RSTR (T) (see also "Explanations of the formula abbreviations").

This equation can be used for every point in time in the duty cycle.

Selecting an infeed unit

When you select an infeed unit for the DC link for highly-dynamic direct drives, it is generally sufficient to determine the peak infeed power that occurs in the duty cycle because the continuous power is usually much lower. The peak infeed power is normally required when the motor accelerates to the maximum speed (see operating point M1 in "Motor torque-speed diagram with the required operating point M1").

If more than one axes is operated, the infeed powers of the individual axes must be added together with the corresponding simultaneity conditions for the purpose of selecting the infeed unit.

5.2Example(s)

Note

The data used here may deviate from the values specified in "Technical data". This does not affect the configuration procedure, however.

1FW6 Built-in torque motors	71
Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3