Description of the Software Modules and Parameters
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
527
4
If the motor operates in the high speed range then due to the high loads the motor reach-
es the non-linear range of the characteristic. The Lq inductance increases the saturation.
The Kp gain of the current controller dependent on the torque current is adapted directly.
Refer to details in
4.7.7.7 Compensation dead time voltages
4.7.7.8 Temperature adaption motor resistances
The temperature influence in the stator resistance can be modeled as follows:
with:
R
cold
Motor resistance at cold motor (20°C) in
,
Cu
Copper temperature coefficient
0,38 %/°C
T
M act
Measured motor temperature in °C,
T
M cold
Motor temperature "cold" (20 °C)
R
actual
Instantaneous value, internally used in the controller, in
The temperature adaption applies to the following:
m
Current prediction (current controller)
m
IxR-pre-control (current controller)
m
Encoderless operation
m
Field angle monitoring (synchronous motors)
The adaption is made automatically if the motor temperature monitoring is activated.
(
bits 0 to 7).
4.7.7.9 Temperature adaption slip frequency
At asynchronous motors with an encoder the output frequency are relatively to the rotor
frequency is determined by the slip frequency specification, f
2 set
. The f
2 set
is directly pro-
portional to the torque current set value. It is inversely proportional to the magnetic flux
set value. It is calculated by the slip frequency at the motor nominal torque current and
the nominal flux, F
2 Tm act
(
) as follows:
R
actual
R
cold
1
Cu
100
---------
T
M act
T
M cold
–
–
=
