Lenze 8400 - Current-Dependent Stator Leakage Inductance Ppp(I)

5 Motor control (MCTRL)
5.8 Sensorless control for synchronous motors (SLPSM)
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Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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5.8.4.4 Current-dependent stator leakage inductance Ppp(I)
The current controller must be adjusted to the electrical characteristics of the motor stator
resistance (C00084
) and stator leakage inductance (C00085). In case of modern motors, the stator
leakage inductance changes with the height of the current so that a new current controller setting
is required for each current height.
When the motor is operated with very low and very high currents (e.g. in Pick and place
applications), it is not always possible to achieve a satisfactory current controller setting for all
operating points. For this purpose, the correction of the stator leakage inductance and current
controller parameters is now possible via an adjustable saturation characteristic (17 interpolation
points).
Short overview of the relevant parameters:
Parameters Info Lenze setting
Value Unit
C02853/1...17 PSM: Ppp saturation characteristic (17 interpolation
points)
100 %
C02855
PSM: Imax Lss saturation characteristic 3000.0 A
C02859
PSM: Activate Ppp saturation char. 0: Off
 Note!
• The saturation characteristic is not only used for the correction of the current
controller but also influences the current controller feedforward control (C00079/1
).
• When a Lenze motor is selected from the »Engineer« motor catalogue, the
corresponding saturation characteristic is set in C02853/1...17
and – if required – the
correction via this saturation characteristic is switched on in C02859
.
• For third-party motors: If the current controller becomes unstable with high currents,
contact the motor manufacturer to find out whether the stator leakage inductance
changes with the current level. If required, the saturation characteristic of this motor
must be set in C02853/1...17
and then activated in C02859.