Parker EME
Setting up Compax3
192-120114 N5 C3I22T11 June 2008 173
4.3.3.2 Configuration
In this chapter you can read about:
Control path ..................................................................................................................... 173
Motor parameters relevant for the
control........................................................................ 174
Mass inertia ..................................................................................................................... 174
Nominal point data........................................................................................................... 174
Saturation values ............................................................................................................. 176
Quality of different feedback systems.............................................................................. 176
Typical problems of a non optimized control ................................................................... 177
Feedback error compensation
......................................................................................... 178
Commutation set
tings ...................................................................................................... 180
I²t - monitoring of
the motor ............................................................................................. 180
Relevant appication parameters
...................................................................................... 183
Asynchronous motors ...................................................................................................... 187
Control path
For the motors, the knowledge of the mathematical model is a prerequisite.
Mathematically idealized model of the control path:
R/1
T
K
T
K
2
2
1
U: Cotrol voltage
U
EMC
: 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