Optimisation Of Motor Control - Lenze i55AE125B Manual

Motor control

Optimisation of motor control

8.3 Optimisation of motor control
Setting of motor data
The inverter provides different functions by means of which the drive behaviour can be fur-
ther optimised.
Function
V/f voltage boost
^ 183
The parameterisable voltage boost makes it possible to improve the
starting performance for applications requiring a high starting tor-
que.
Skip frequencies
^ 184
By means of the three parameterisable skip frequencies, critical fre-
quencies can be suppressed which lead to mechanical resonances in
the system.
Optimising the stalling behaviour
For special motors which enable an operation in the field weakening
range, the behaviour in the field weakening range can be adapted to
the motor.
Slip compensation
^ 188
In case of a load, the speed of an asynchronous motor decreases.
This load-dependent speed drop is called slip. The slip compensation
serves to counteract the load-dependent speed loss.
Oscillation damping
^ 190
The oscillation damping serves to reduce the oscillations during no-
load operation which are caused by energy oscillating between the
mechanical system (mass inertia) and the electrical system (DC bus).
For controlling a permanent-magnet synchronous motor, the pole
position - the angle between the motor phase U and the field axis of
the rotor - must be known. This function serves to detect the pole
position for the currently activated motor encoder.
182
Motor control selection
^ 186
VFC open loop
VFC closed loop
SC-ASM
SL-PSM
Optimisation of motor control
Motor control type
VFC open VFC closed
loop loop
l l
l l
l l
l
l l
= V/f characteristic control
= V/f characteristic control with speed feedback
= servo control for asynchronous motor
= sensorless control for synchronous motor
SLVC = sensorless vector control
Optimisation of the control loops
SC-ASM SL-PSM SLVC
l l l
l