Lenze 8400 motec - Manual (Page 135)

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05 135
5 Motor control (MCTRL)
5.9 Sensorless control for synchronous motors (SLPSM)
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5.9.4.1 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:
5.9.4.2 Optimise speed controller
The speed controller is designed as a PID controller. For optimum behaviour, the PID speed controller
has to be optimised and the overall mass inertia of the drive train has to be determined.
• In the Lenze setting, the configuration of the speed controller provides robustness and
moderate dynamics.

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«!
Parameter 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 [ ]
---------------- =
Parameter Info Lenze setting
Value Unit
C00070/3 SLPSM: Vp speed controller 3.00
C00071/3 SLPSM: Ti speed controller 100.0 ms