Apparatus and method for driving an induction motor

H - Electricity – 02 – P

Patent

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Details

H02P 27/06 (2006.01) H02P 25/02 (2006.01) H05K 10/00 (2006.01)

Patent

CA 2592354

An induction motor drive includes a plurality of inverters, a changeover switch which changes over outputs of the plurality of inverters to be supplied to one induction motor and a changeover controller which controls the changeover switch on the basis of a failure detection signal of one inverter to change over from the one inverter to another inverter to start the other inverter so that the induction motor is driven. The changeover controller includes a frequency/phase detector which always detects a frequency and a phase of a terminal voltage of the induction motor and a starting frequency/phase setting device which controls a frequency and a phase at starting of the other inverter in accordance with detected values of the frequency/phase detector when the failure signal is inputted.

Un dispositif d'entraînement de moteur à induction comprend les éléments qui suivent. De multiples inverseurs; un commutateur qui commute les signaux de sorties des multiples inverseurs, à appliquer à un moteur à induction; et un contrôleur de commutation qui contrôle le commutateur en fonction du signal de détection de défaillance d'un inverseur, pour passer d'un inverseur à l'autre, et l'enclencher, de sorte que le moteur à induction soit entraîné. Le contrôleur de commutation comprend un comparateur de phase et de fréquence qui détecte toujours la fréquence et la phase d'une tension aux bornes du moyeur à induction. Ce contrôleur comprend aussi un dispositif d'établissement de fréquence et de phase de démarrage qui commande la fréquence et la phase au démarrage de l'autre inverseur, conformément aux valeurs détectées du comparateur de phase et de fréquence, lors de l'application du signal de défaillance.

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