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5
Motor control (MCTRL)
5.7
Sensorless vector control (SLVC)
200
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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Speed controller reset time Ti
Apart from setting the P component,
provides the possibility to take influence on the I
component of the PI controller.
Tip!
Value range recommended by Lenze for the setting of the reset time:
Ti = 20 ms … 150 ms
5.7.4.3
Optimising dynamic performance and field weakening behaviour
In the Lenze setting, the torque controller has been preset in such a way that robust and stable
operation with a moderate dynamic response is enabled over the entire speed range. Retrospective
optimisation of the controller parameters is not necessary.
A greater dynamic performance of the sensorless vector control can be achieved by reducing time
constant Ti of the speed controller (
).
A greater dynamic performance of the field weakening function can be achieved by setting a time
constant
≤
15 ms. This means for actual speeds above rated speed a better torque-speed-
characteristic in the field weakening range:
[5-11] Speed / torque characteristic diagram in the field weakening range
• For Ti > 15 ms (see
), the actual speed value slightly drops in the field weakening range if the
load torque increases in the motor mode.
• For Ti
≤
15 ms (see
), the speed remains stable in the field weakening range if the torque is
within the M/n characteristic field highlighted in grey.
Tip!
For applications with high dynamic performance and speed/torque accuracy requirements
in the field weakening range, we recommend a time constant Ti
≤
15 ms.
In this case, the maximum torque should be limited via the
nTorqueMotLimit_a
and
nTorqueGenLimit_a
process input signals to 1.5 x M
N
to ensure stable operation in the field
weakening range.
Parameters
Info
Lenze setting
Value Unit
SLVC: Vp torque controller
1.25
SLVC: Ti torque controller
30 ms
Torque controller time constant Ti > 15 ms
Torque controller time constant Ti
≤
15 ms
1
0
n
N
n
N
M
N
M
N
M
M
n
n