Baumuller b maXX BM3000 - Breakdown Torque

Controllers
Parameter manual b maXX BM3000
Document no.: 5.12001.07 Baumüller Nürnberg GmbH
498
of 820
4.7
4.7.4.1 Breakdown torque
Two limits of the breakdown torque are possible:
m Breakdown torque limit: A controlled procedure limiting the maximum torque current
in dependence of the voltage and the speed.
m Breakdown torque controller: A controlled procedure readjusting the maximum
torque current on the basic of the available voltage.
Figure 165: ProDrive Breakdown torque
Breakdown Torque
There is a speed-dependent torque current limit I
sq,K,limit
in the BM3300 so that the de-
manded Ud voltage can be limited to a defined limit U
d,Max
as follows:
Thereby, the inductance Lq accords to the inductance of the motor control: Inductance of
measuring values (
Z123.7–) or of motor data (Z107.34– and Z107.30– + Z107.32–) ac-
cording to the setting of bit 3 in Z123.10–.
The Ud voltage should not be more than the phase voltage U
ph,Max
. However, it is rec-
ommended to limit the voltage to the 1/2-fold U
ph,Max
.
I
sq,K,limit
U
d,Max

el
L
q

-----------------=
U
d,Max
1
2
-------
U
ph,Max
=