1 optimising field feedforward control, Optimising field feedforward control, 6motor interface – Lenze E94AxPExxxx User Manual
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Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
221
6
Motor interface
6.5
Sensorless vector control (SLVC)
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6.5.3.1
Optimising field feedforward control
To optimise the field feedforward control, the drive must be accelerated in the base speed range
with slow setpoint ramps (e.g. acceleration time = 5 s) to speed values below the rated speed and
then decelerated again.
• If the field current oscillates at the beginning of the acceleration and at the end of the
deceleration (Current.dnActualDirectCurrent), these oscillations can be reduced by increasing
the gain for the field current controller in
.
[6-9]
Oscillogram 1: speed ramp (motor 55 kw) – field controller gain = 0.00
[6-10] Oscillogram 2: speed ramp (motor 55 kw) – field controller gain = 2.00
Ch Variable of the motor control
Unit
1/Div
Offset
Position
1
Speed.dnSpeedSetpoint (speed setpoint)
rpm
0.2k
0
-4
2
Speed.dnActualMotorSpeed (current speed)
rpm
0.2k
0
-4
3
Current.dnActualDirectCurrent (actual field current)
A
10
0
0
4
Current.dnQuadratureCurrentSet (cross current setpoint)
A
10
0
0
5
Current.dnActualQuadratureCurrent (actual cross current)
A
10
0
0