Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
L
213
8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
5.9.9
Field weakening for synchronous motors
This function extension is available from version 11.00.00!
[5-21] Voltage/speed characteristic with switched-on field weakening
[5-22] Calculation of the maximally reachable speed with switched-on field weakening
Note!
Function only available for sensorless control for synchronous motors (SLPSM)
(from version 10.00.00)
.
In the Lenze setting, the field weakening for synchronous motors is set in
C00079/4
.
• If a high energy efficiency is required, keep the field weakening switched off
or restrict the field weakening operation via
C00938
.
Stop!
In the field weakening operation, a current is injected into the synchronous
motor even in idle state which can rise to maximum current (
C00022
).
Ensure that this no-load current does not cause the motor to be heated
impermissibly!
• We recommend using a temperature feedback via PTC or thermal contact.
Motor temperature monitoring (PTC)
(
236)
n
Armature control range
o
Field weakening range
When field weakening is switched on, the motor
magnetising current is increased from 0 A to the
maximally effective magnetising current via an
internal control loop when the voltage limit is
reached.
As a result, a higher speed can be reached at the same
motor voltage or DC-bus voltage.
n
U
motor
n
max
n
nenn_mot
800V
2 U
nenn_mot
⋅
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⋅
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