Direct Torque Control; Fig. 16; Fig. 17. Dtc Torque Control - ABB ACS5000 User Manual

3.4.2.2. Direct 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.

Fig. 16.

1
2
4
3
Key:
(1) Torque reference
(2) Speed reference
(3) Actual reference
(4) Speed controller
(5) Torque reference controller
(6) Torque-flux comparator

Fig. 17. DTC torque control

Switching of the semiconductors is directly controlled in accordance with the motor core
variables flux and torque.
The measured motor currents and DC link voltages are inputs to an adaptive motor model. The
model produces exact values of torque and flux every 25 μs. Motor torque and flux comparators
compare the actual values to reference values which are 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 ms and initiates switching
whenever required.
PRODUCT
ACS5000W gen. 2
5
DOCUMENT KIND
User manual
POWER ELECTRONICS AND CABINET FEATURES
6
8
9
7 10
11
(7) Motor model
(8) Switching logic
(9) Switch positions
(10) Voltage
(11) Current
(12) Motor
DOCUMENT ID.
3BHS799208 E01
12
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