Setting
up Compax3
C3I12T11
176
192-120113 N08 C3I12T11 - December 2010
4.4.3.2
Configuration
In this chapter you can read about:
Control path ................................................................................................................... 176
Motor parameters relevant for the control ...................................................................... 177
Mass inertia ................................................................................................................... 177
Nominal point data ........................................................................................................ 177
Saturation values ........................................................................................................... 179
Quality of different feedback systems ............................................................................ 179
Typical problems of a non optimized control .................................................................. 180
Feedback error compensation ....................................................................................... 181
Commutation settings .................................................................................................... 182
I²t - monitoring of the motor ........................................................................................... 182
Relevant application parameters ................................................................................... 185
Asynchronous motors .................................................................................................... 189
Control path
For the motors, the knowledge of the mathematical model is a prerequisite.
Mathematically idealized model of the control path:
T=L/R
R
/
1
T
K
-
n
U
EMK
U
I
M
L
M
A
-
T
K
π
2
π
2
1
J
Mot
J
Ext
a
J
ges
motor
application
M
B
U:
Control voltage
U
EMK
:
electromagnetically generated voltage in the motor
T:
electric time constant of the motor winding
L:
Winding Inductance
R:
Winding Resistance
M
A
:
Drive torque of the motor
M
L
:
Load torque
M
B
:
Acceleration torque
I:
Actual current r.m.s. (torque-producing)
K
T
:
Torque constant
J
mot
:
Motor mass moment of inertia
J
ext
:
external mass moment of inertia
J
total
:
Total mass moment of inertia
a:
Acceleration
n:
Velocity
