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

Advanced commissioning
6.21 Motor control
6.21.3

Vector control

6.21.3.1

Structure of the vector control

Overview
The vector control comprises closed-loop current control and a higher-level closed-loop speed
control.
for induction motors
1)
Selecting the control mode
2)
Settings that are required
3)
Figure 6-52 Simplified function diagram for vector control with speed controller
Using the motor model, the inverter calculates the following closed-loop control signals from
the measured phase currents and the output voltage:
● Current component I
● Current component I
● Speed actual value for encoderless vector control
The setpoint of the current component I
speeds above the rated speed, the inverter reduces the flux setpoint along the field weakening
characteristic.
298
q
q
(flux setpoint) is obtained from the motor data. For
d
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG
Converter with the CU250S-2 Control Units