Sensorless vector control (SLV)
SLV control is a further technological
development of V/f control. If increased demands are
placed on the three-phase motor, it generally
requires a control which uses a sensor, e.g.
incremental encoder on the motor shaft, so that the
measured motor speed is fed back to the control
loop. However, SLV control does not need a sensor.
This is where the term sensorless originates.
However, it is just as high-performance as vector
control which requires sensor feed back. The motor
speed is calculated in the frequency inverter using
a mathematical motor model. The downstream control
provides the correct torque in the respective
operating state.
SLV control has the following advantages over V/f
control:
- Short reaction times with setpoint value
changes
- Short response times with load changes
- High torque, even at low speeds (e.g. DV51
start torque > 200 % at approx. 1 Hz)
- High speed stability with load change
These advantages can be used with the
DV51 without the
requirement for comprehensive adjustment work. The
new innovative control method means that "auto
tuning" or similar processes for determination of
the motor characteristics are no longer necessary.
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