Control of a field-orientated system

R. Wirfs (Adviser: K. Hasse)

Status: finished by PhD in 1991

A method for the open loop speed control of an induction motor in the field-weakening range is developed. Utilization of the machine is improved during partial load operation and the switching losses of the inverter are decreased. For a good dynamic performance the stator frequency and the actual position of the stator voltage vector is used to control the torque component of the stator current.

Available only in German:

Wirfs, Rolf: “Ein Verfahren zur Regelung umrichtergespeister Asynchronmaschinen mit Hilfe einer gesteuerten Feldorientierung.” D17 Darmstädter Dissertation 1991 (Übersicht) (opens in new tab)

Self-tuning control for an induction motor

E. Lettner (Advisor: R. Jötten)

Status: finished by PhD Thesis in 1991

A speed control loop for an induction machine fed by a voltage source inverter is realized within a µ-controller. The µ-controller determines the parameters necessary for the control system during start-up taking into account the nominal and limited data of the converter and the motor. The parameter are adapted during operation.

Available only in German:

Lettner, Ernst: “Selbsteinstellendes und selbstanpassendes Antriebsregelsystem für die Asynchronmaschine mit Stromzwischenkreisumrichter.” D17 Darmstädter Dissertation 1991 ( Übersicht) (opens in new tab)