Research on direct torque control algorithms of induction motors

J. Faßnacht (Advisor: P. Mutschler )

Status: finished by PhD Thesis in 2002

High dynamic of a drive can be achieved by direct control algorithms. A direct Controller is a switching controller that chooses directly the next switching events according to the aim of control. It works without a traditional (linear) controller and also without a pulse width modulator.

In this research project the focus is on parameter adaptation and identification to improve the stator flux observer of the Direct Mean Torque Control algorithm and the field weakening range of an induction machine controlled by a direct control algorithm. The research project comprises the simulation of the whole drive system and the improvement of an existing experimental drive plant. With this plant the control algorithms are implemented and tested.

Mutschler, P.; Faßnacht, J.: “Der PC als Echtzeit-Regelungsrechner in der Entwicklungsphase neuer Antriebsregelungen” SPS/Drives`99, Nürnberg S. 783 – 792 (opens in new tab)

Faßnacht J.; Mutschler, P.: “An observer to improve the speed signal using a Ferraris acceleration sensor” EPE 2001, 27.08.-29.08., Graz, Austria (opens in new tab)

Faßnacht J.; Mutschler, P.: “Benefits and limits of using an acceleration sensor in actively damping high frequency mechanical oscillations” IEEE-IAS 2001, 30.09.-05.10.2001, Chicago, USA (opens in new tab)

Faßnacht J.; Mutschler, P.: “Schwingungsbedämpfung bei steif gekoppeltem Dreimassenschwinger mit unterlagerter direkter Drehmomentregelung” A&D Kompendium 2002, Seite 78 (opens in new tab)

“Vergleich zwischen einem PI-Drehzahl- und einem PI-Zustandsregler zur aktiven Dämpfung mechanischer Schwingungen” SPS/IPC/DRIVES, Nürnberg, 26.-28. Nov. 2002 (opens in new tab)

“Schwingungsbedämpfung in Servosystemen mit der direkten Drehmomentmittelwertregelung” Darmstädter Dissertation D17, 2002 (opens in new tab)

Faßnacht J.; Mutschler, P.: “Direct Mean Torque Control with improved flux control” EPE 2003, 02.-04.09., Toulouse, Frankreich (opens in new tab)

E. Flach (Advisor: P. Mutschler )

Status: finished by PhD Thesis in 1999

A new highly dynamic direct torque control algorithms of an induction motor with voltage source inverter was developed. The next two inverter switching events are calculated by the Direct Mean Torque Control algorithm in a way that the mean torque is exactly of the desired value. The inverter works with constant switching frequency.

E. Flach: “Direkte Regelung des Drehmomentmittelwertes einer Induktionsmaschine” Darmstädter Dissertation, 1999 (Zusammenfassung) (opens in new tab)

E. Flach: “Improved algorithm for direct mean torque control of an induction motor” PCIM '98, Nürnberg, Mai 1998, Seite 261-267 (opens in new tab)

E. Flach, R. Hoffmann, P. Mutschler: “Direct mean torque control of an induction motor” 7th European Conference on Power electronics and Applications (EPE '97), Trondheim, 1997, page 3.672-3.677 (opens in new tab)

U. Probst (Advisor: P. Mutschler )

Status: finished by PhD Thesis in 1994

A speed control for an induction motor which is fed by a voltage source inverter of 8 kHz switching frequency shall be developed by using a signal processor. Thereby better characteristics at shock loads should be reached. Besides the classical cascade-control structure a state variable feedback controller is analysed and realised. The sin/cos – position sensor is evaluated carefully and precision is enhanced by using a correction table for the sensor.

Available only in German:
Uwe Probst :“Untersuchungen zur Verbesserung des Lastverhaltens elektrischer Antriebe am Beispiel einer mikrorechnergeregelten Asynchronmaschine.” Darmstädter Dissertation 1994 (Übersicht) (opens in new tab)

Available only in German:
Uwe Probst : Comparision of Disturbance Supression Strategies for Serco-Drives, EPE 93, Bringhton, 13.-16.09.1993, The European Power Electronics Association, Seite 442-446 (opens in new tab)

Available only in German:
Uwe Probst :"Feldorientierung einer Asynchronmaschine aus Grundschwingungswerten von Strangströmen und Strangspannungen mit einem Signalprozessor (opens in new tab)
12. Internationale Fachtagung Industrielle Automatisierung-Auromatisierte Antriebe; Chemnitz, Februar 1993 Seite 52-55 (Abstract)

Available only in German:
Uwe Probst :“Feldorientierung einer Asynchronmaschine aus gefilterten Klemmengrößen” (opens in new tab)
SPS-IPS-DRIVES 92, Stuttgart November 1992, VDE-Verlag S. 617-626 (Abstract)