Advanced commissioning
6.15 Motor control
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
197
6.15.2
Vector control with speed controller
6.15.2.1
Structure of the vector control
Overview
The vector control comprises closed-loop current control and a higher-level closed-loop
speed control.
1)
for induction motors
2)
Selecting the control mode
3)
Settings that are required
Figure 6-39 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
q
●
Current component I
q
●
Speed actual value for encoderless vector control
The setpoint of the current component I
d
(flux setpoint) is obtained from the motor data. For
speeds above the rated speed, the inverter reduces the flux setpoint along the field
weakening characteristic.
