System and method for automatic current limit control

Details System and method for automatic current limit control System and method for automatic current limit control

B - Operations, Transporting

66

B

B66B 1/28 (2006.01) H02P 1/26 (2006.01) H02P 27/16 (2006.01)

Patent

CA 2499194

A motor controller system comprises solid state switches for connection between an AC line and motor terminals for controlling application of AC power to the motor. A sensor senses AC line voltage. A control circuit controls operation of the solid state switches. The control circuit ramps switch current during a start mode and selectively holds switch current during the start mode if sensed voltage drops below a threshold amount.

L'invention concerne un système de commande de moteur qui comprend des commutateurs à semi-conducteurs assurant la connexion entre une ligne à CA et des bornes de moteur en vue de commander l'application du courant alternatif au moteur. Un capteur détecte la tension de la ligne à CA. Un circuit de commande actionne le fonctionnement des commutateurs é semi-conducteurs. Le circuit de commande monte en puissance le courant de commutation lors d'un mode de démarrage et maintient de manière sélective ledit courant de commutation pendant le mode de démarrage si la tension captée descend sous une valeur seuil.

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