7.3. Optimisation of motor control
The inverter provides different functions by means of which the drive behaviour can be
further optimised.
123
The parameterisable voltage boost makes it possible to improve the
starting performance for applications requiring a high starting torque.
124
By means of the three parameterisable skip frequencies, critical
frequencies can be suppressed which lead to mechanical resonances in
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Optimising the stalling behaviour
126
For special motors which enable an operation in the field weakening
range, the behaviour in the field weakening range can be adapted to the
128
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 loaddependent speed loss.
130
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).
Synchronous motor: Pole position identification (PPI)
131
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.
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VFC open loop = V/f characteristic control
SL-PSM = sensorless control for synchronous motor
SLVC = sensorless vector control
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