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.
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