Rotor flux field-oriented control (Vector Control) method is commonly used in EV induction motor drive systerns. To implement this control method, rotor flux estimation from terminal variables is a key step because the rotor flux vector cannot be measured unless flux sensors are mounted inside the motor. In this paper, a new rotor flux observer is presented. The new observer is obtained in the reference frame rotating with the stator current vector (alpha-beta frame). Because the two components of rotor flux to be estimated in the alpha-beta frame are DC quantities, a convergent discrete-time model of the observer can be obtained by simply using forward differences to approximate the derivatives in its continuous-time model. Therefore, the required computational work is largely reduced. Once the rotor flux in the alpha-beta frame is obtained, it can be easily transformed to any other reference frame by simple co-ordinate transformation. The simulation results have verified the validity of the new method and indicated the advantages of the new observer over conventional one.
A new rotor flux observer for EV induction motor drives
Ein neuartiges Verfahren zur Überwachung des Magnetflusses im Rotor für den Einsatz bei Asynchronmotoren für Elektrofahrzeuge
1999
7 Seiten, 6 Bilder, 6 Quellen
Conference paper
English
A new rotor flux observer for electric vehicle induction motor drives
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