Sensorless Vector Control With Speed Controller; Structure Of Vector Control Without Encoder (Sensorless) - Siemens SINAMICS G110M Operating Instructions Manual

Advanced commissioning
8.19 Motor control
8.19.2

Sensorless vector control with speed controller

8.19.2.1

Structure of vector control without encoder (sensorless)

Overview
The vector control comprises closed-loop current control and a higher-level closed-loop speed
control.
for induction motors
1)
Settings that are required
2)
Figure 8-54 Simplified function diagram for sensorless 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
The setpoint of the current component I
speeds above the rated speed, the converter reduces the flux setpoint along the field weakening
characteristic.
When the speed setpoint is increased, the speed controller responds with a higher setpoint for
current component I
setpoint by adding a higher slip frequency to the output frequency. The higher output frequency
also results in a higher motor slip, which is proportional to the accelerating torque. I
296
q
q
(flux setpoint) is obtained from the motor data. For
d
(torque setpoint). The closed-loop control responds to a higher torque
q
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL
Distributed converter for SIMOGEAR geared motors
and
q