Vector Control With Speed Controller; Structure Of The Vector Control - Siemens SINAMICS G120D Operating Instructions Manual

8.16.2

Vector control with speed controller

8.16.2.1

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)
3) Settings that are required
Figure 8-43 Simplified function diagram for vector control with speed controller
Using the motor model, the converter 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 converter reduces the flux setpoint along the field weakening
characteristic.
Converter with the control units CU240D-2
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH
q
q
(flux setpoint) is obtained from the motor data. For
d
Advanced commissioning
8.16 Motor control
231