Closed-Loop Speed Control; Properties Of The Sensorless Vector Control - Siemens Sinamics G120P Operating Instructions Manual

7.5.2

Closed-loop speed control

7.5.2.1

Properties of the sensorless vector control

Using a motor model, the speed control calculates the load and the motor slip. As a result of
this calculation, the inverter controls its output voltage and frequency so that the motor
speed follows the setpoint, independent of the motor load.
Speed control is possible without directly measuring the motor speed and is therefore also
called "sensorless vector control".
Figure 7-15 Simplified function diagram of sensorless vector control
You can find additional information on speed control in the function diagrams 6020 ff. of the
List Manual.
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
Functions
7.5 Motor control
357