Method for operating asynchronous motors and corresponding...

H - Electricity – 02 – P

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H02P 27/18 (2006.01) H02P 27/02 (2006.01)

Patent

CA 2395500

Asynchronous motors are controlled by way of two- or three-phase antiductors that comprise at least two pair of thyristors connected in antiparallel and fired at certain intervals. According to the inventive method, a fundamental wave with the desired frequency is defined for the first phase and in the other phase a respective fundamental wave is defined that has the same frequency as that in the first phase but phase-shifted by corresponding values. For every phase, firing intervals are marked that have the same polarity as the respective fundamental wave. Those intervals of the potential firing intervals are used for every phase at which there is a potential firing interval in one of the two other phases. These intervals are used as the actual firing intervals.

Des moteurs asynchrones sont commandés à l'aide d'un gradateur diphasé ou triphasé qui comprend au moins deux paires de thyristors à couplage antiparallèle, qui sont activés à des moments définis. Selon l'invention, une onde fondamentale présentant la fréquence désirée est définie pour la première phase et, dans les autres phases est définie une onde fondamentale qui présente la même fréquence que celle de la première phase mais qui présente un décalage de phase d'une valeur correspondante. Pour chaque phase les moments d'activation pour lesquels la polarité est la même que celle de l'onde fondamentale respective sont marqués. Pour chaque phase sont utilisés les moments d'activation potentiels auxquels il y a un moment d'activation potentiel dans une des deux autres phases. Ces moments sont utilisés en tant que moments d'activation effectifs.

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