Apparatus and system for controlling the operating frequency...

B - Operations – Transporting – 06 – B

Patent

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B06B 1/02 (2006.01) H02P 25/02 (2006.01)

Patent

CA 2338683

An apparatus and system are provided for controlling the operating frequency of an electromagnetic vibratory feeder (150) at a submultiple of the power line frequency. The apparatus is couplable to a terminal of an electromagnetic coil (155) of the electromagnetic vibratory feeder (150), to control the current through the electromagnetic coil (155) and thereby control power delivered to the electromagnetic vibratory feeder. The apparatus includes a quadrac (115) coupled to the alternating current source; a capacitor (125) coupled to the AC current power source and coupled through a first diode (120) to a gate electrode of the quadrac (115); and a resistive network (160) coupled through a second diode (130) to the capacitor (125) and to the first diode (120). The capacitance value of the capacitor (125) and the resistive value of the resistive network (160) form an RC time constant, which predetermined to provide a selected operating frequency for triggering the quadrac (115) and thereby providing power to the electromagnetic vibratory feeder (150) at a submultiple of the power line frequency.

L'invention concerne un appareil et un système permettant de maintenir la fréquence d'exploitation d'une source électromagnétique vibrante (150) à un sous-multiple de la fréquence d'alimentation. On peut coupler l'appareil à un terminal de bobine électromagnétique (155) de ladite source (150), de manière à contrôler le courant passant dans ladite bobine (155), et donc à contrôler la puissance fournie à cette source. L'appareil comprend un quadrac (115) couplé à la source de courant alternatif; un condensateur (125) couplé à la source de courant alternatif, et couplé à une gâchette du quadrac (115) par une première diode (120); et un réseau de résistances (160) couplé au condensateur (125) et à la première diode (120) par une seconde diode (130). La capacité du condensateur (125) et la résistance du réseau de résistances (160) forment une constante de temps RC, laquelle est prédéterminée de manière à fournir une fréquence d'exploitation donnée pour déclencher le quadrac (115) et alimenter ainsi la source électromagnétique vibrante (150) à un sous-multiple de la fréquence de ligne.

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