Vector Control; Properties Of The Sensorless Vector Control - Siemens SINAMICS G120 Operating Instructions Manual

Functions
9.6 Motor control
9.6.2

Vector control

9.6.2.1

Properties of the sensorless vector control

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 9-20 Simplified function diagram of sensorless vector control
190
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB