Figure 3-13 Dtc Torque Control - ABB ACS5000 User Manual

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.
1
2
4
3

Figure 3-13 DTC torque control

1) Torque reference
2) Speed reference
3) Actual reference
4) Speed controller
5) Torque reference controller
6) Torque-flux comparator
Switching of the semiconductors i 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 microseconds.
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
5
DOCUMENT KIND
User manual
POWER ELECTRONICS AND CABINET FEATURES
8
6
9
7 10
11
7) Motor model
8) Switching logic
9) Switch positions
10) Voltage
11) Current
12) Motor
DOCUMENT ID.
3BHS799208 E01
12
REV. LANG. PAGE
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