Safety start

Details Safety start Safety start

H - Electricity

02

P

H02P 1/26 (2006.01)

Patent

CA 2436017

A starting circuit for an induction motor is provided whereby a stationary rotor flux is established then a stored charge supplied to a motor winding in order to provide a starting torque. Before applying a mains power supply to the motor after the starting torque has been applied, a back EMF is sensed, directly or indirectly, to provide an indication that the rotor is turning before the mains supply is connected to the motor. This provides a reliable and simple method for ensuring that a mains supply may be safety connected to the motor.

La présente invention concerne un circuit de démarrage pour un moteur dans lequel un flux de rotor fixe est créé puis une charge stockée est appliquée à un enroulement du moteur pour produire un couple de démarrage. Avant l'application, au moteur, d'un courant d'alimentation principale après l'application du couple de démarrage, un signal de retour EMF est détecté, de manière directe ou indirecte, pour donner une indication que le rotor tourne effectivement, avant de connecter l'alimentation principale au moteur. Ce système constitue ainsi un procédé simple et fiable qui permet d'assurer qu'une alimentation principale peut être couplée, sans risque, au moteur.

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