106
Speed control by real sensorless vector
control, vector control
4.4.5
Speed feed forward control, model adaptive speed control (Pr. 828, Pr. 877 to Pr.
881)
(1) Block diagram
By making parameter setting, select the speed feed forward control or model adaptive speed control.
The speed feed forward control enhances the trackability of the motor in response to a speed command
change.
The model adaptive speed control enables individual adjustment of speed trackability and motor disturbance
torque response.
Parameter
Number
Name
Initial Value
Setting Range
Description
828
Model speed control
gain
60%
0 to 1000%
Set the gain for model speed controller.
877
Speed feed forward
control/model
adaptive speed
control selection
0
0
Normal speed control is exercised.
1
Speed feed forward control is exercised.
2
Model adaptive speed control is enabled.
878
Speed feed forward
filter
0s
0 to 1s
Set the primary delay filter for the speed feed
forward result calculated using the speed
command and load inertia ratio.
879
Speed feed forward
torque limit
150%
0 to 400%
Limits the maximum value of the speed feed
forward torque.
880
Load inertia ratio
7 times
0 to 200 times
Set the load intertia ratio to the motor.
881
Speed feed forward
gain
0%
0 to 1000%
Set the feed forward calculation result as a gain.
POINT
When model adaptive speed control is selected, the data obtained from easy gain tuning is used for
Pr. 828 Model
speed control gain
. Perform easy gain tuning also (simultaneously).
(Refer to page 99)
Sensorless
Sensorless
Sensorless
Vector
Vector
Vector
Load inertia ratio
iq current
control
Speed estimator
Speed control
P gain 1
Pr.820
Speed control
integral time 1
Pr.821
IM
Speed
command
1
2
2
0
Pr.878
Speed feed
forward filter
Pr.879
Speed feed
forward torque
limit
Pr.877
Actual speed
controller
Speed feed
forward gain
Pr.881
+
-
+
+
+
1
Model adaptive speed control
Model speed
control gain
Pr.828
J
Torque factor
(J :
Pr.880
)
1
2
Pr.877
Model speed
operation
1
+
-
J s
Pr.880
J s
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