Method and device for speed control of an ac motor

H - Electricity – 02 – P

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H02P 3/24 (2006.01) H02P 3/18 (2006.01) H02P 27/02 (2006.01)

Patent

CA 2176263

A method and device are disclosed for speed control of an AC induction motor by means of a control circuit which generate a motor drive voltage consisting of a combination of AC and time-spaced DC pulses. During the occurrence of the time-spaced DC pulses in the motor's AC drive voltage a back EMF suppression network is activated to absorb the motor's generated back EMF energy. A further feature of the invention is a slow down mode where the motor is decelerated from continuous full cycle AC to a requested slow speed setting by means of a higher contend of DC pulses in the AC drive voltage.

Méthode et dispositif permettant de commander la vitesse d'un moteur à induction c.a. au moyen d'un circuit de commande qui produit une tension d'attaque de moteur consistant en une combinaison d'impulsions c.a. et d'impulsions c.c. espacées dans le temps. Pendant que les impulsions c.c. espacées dans le temps sont présentes dans la tension d'attaque c.a., un réseau de suppression de f.c.é.m. est activé afin d'absorber l'énergie de la f.c.é.m. du moteur. Une autre caractéristique de l'invention consiste en un mode de ralentissement dans lequel le moteur est décéléré, passant d'un régime c.a. à cycle complet continu à un régime à faible vitesse demandé, du fait de l'accroissement des impulsions c.c. dans la tension d'attaque c.a.

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