Parameter identification and comparison of an induction motor models

The significance of squirrel cage induction motors in speed and position controlled drives have grown drastically. The reason is the large-scale exploitation of the AC induction motors in the technologies, which traditionally used DC motors. Furthermore, to achieve high efficiency of the technology, many noncontrolled AC drives are reconstructed by adding frequency converters and they are used now as speed controlled drives. To attach perfect static and dynamic qualities of these drives, control engineers need more information about the control object. Therefore, the importance of the models, characteristics and parameter determination of the squirrel cage induction motor has markedly grown. The most important means of the drive design and control is a perfect model of a motor. Moreover the model-based control methods of the induction motor drives are most effective and usable. The types of models available are discussed with emphasis on the three-phase vector model and reference to equivalent circuits. The fuzzy parameter determination of an equivalent circuit is then described.