Lenze 8400 - Optimise Current Controller

Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23 217
5 Motor control (MCTRL)
5.8 Sensorless control for synchronous motors (SLPSM)
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5.8.4.1 Optimise current controller
An optimisation of the current controller is sensible since the two control parameters gain (C00075)
and reset time (C00076
) depend on the required maximum current and the set switching
frequency.
• Gain and reset time can be calculated as per the following formulae:
 Note!
An optimisation of the current controller should generally be carried out unless a power-
adapted standard motor is used or the motor has been selected from the motor
catalogue of the »Engineer«!
Parameters Info Lenze setting
Value Unit
C00075 Vp current controller 7.00 V/A
C00076
Ti current controller 10.61 ms
V
p
= Current controller gain (C00075)
T
i
= Current controller reset time (C00076)
L
ss
= Motor stator leakage inductance (C00085)
R
s
= Motor stator resistance (C00084)
T
E
= Equivalent time constant (= 500 μs)
V
p
L
ss
H[]
T
E
s[]
----------------
=
T
i
L
ss
H[]
R
s
Ω[]
----------------
=