ABB ACS6080 - Speed and torque control

POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
55/266
3.2.5.5. Speed and torque control
The speed and torque of the motor is controlled by DTC (direct torque control). The
DTC motor control platform is unique to ABB and has been proven in all variable
speed drives of the ACS product range. DTC provides accurate speed and torque
control, and high dynamic speed response. DTC is implemented on the AMC circuit
board of the INU.
Figure 3-15 DTC control platform
Switching of the semiconductors in the INU is directly controlled in accordance
with the motor core variables flux and torque.
The measured motor currents and DC-link voltage are inputs to an adaptive motor
model. The model produces exact values of torque and flux every 25 microseconds.
Motor torque and flux comparators compare the actual values to reference values
produced by the torque and flux reference controllers.
Depending on the outputs from the hysteresis controllers, the switching logic
directly determines the optimum switch positions every 50 microseconds and
initiates switching whenever required.
1) Torque reference
2) Speed reference
3) Actual speed
4) Speed controller
5) Torque reference controller
6) Torque-flux comparator
7) Motor model
8) Switching logic
9) Switch positions
10) Voltage
11) Current
12) Motor
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