6.2.15.2 Operation with encoder without motor model
This operating mode has almost no validity.
The possibility to activate the EMF adaptation or to operate on model currents is
missing at the synchronous machine in this mode.
The slip is determined from the equivalent circuit data (not from the rated speed) at
the asynchronous machine in this mode. That means, identification of the motor
data is mandatory.
Additional possibilities, like Tr-adaption or driving on model currents can not be ac-
tivated in this mode.
6.2.15.3 Operation with encoder with motor model
This is the operating mode for speed-controlled operation with encoder.
Advantages at operation with model:
▪ The flux at the asynchronous machine is adapted by the model.
▪ The adaption of EMF or rotor time constant is possible. This increases the
torque accuracy.
▪ Driving on model currents (ds04 bit 07) is possible, advantageous at output
frequencies > 400Hz.
6.2.15.4 Operation without encoder with motor model
The type of model control is important in this mode (=> Chapter 6.2.16 Model con-
trol (ASM and SM) ).
The model cannot be operated stable at low output frequencies. Make sure that
this range is quickly passed.
A degree of freedom for the asynchronous motor is speed, i.e. it can differ from the
estimated speed. The torque accuracy is given.
Overview of the functions which can be activated dependent on the operating
mode and motor:
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