
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)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5.8.4.1
Optimise current controller
An optimisation of the current controller is sensible since the two control parameters gain (
)
and reset time (
) 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
Vp current controller
7.00 V/A
Ti current controller
10.61 ms
V
p
= Current controller gain (
)
T
i
= Current controller reset time (
L
ss
= Motor stator leakage inductance (
R
s
= Motor stator resistance (
T
E
= Equivalent time constant (= 500
μ
s)
V
p
L
ss
H
[ ]
T
E
s
[ ]
----------------
=
T
i
L
ss
H
[ ]
R
s
Ω
[ ]
----------------
=