Dosing pump and method for enhancing dosing precision

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 13/00 (2006.01) F04B 49/02 (2006.01) F04B 49/06 (2006.01) H02P 3/24 (2006.01)

Patent

CA 2275756

The invention relates to a method for increasing the dosing precision of a dosing pump which is driven by an asynchronous motor via an eccentric gear. A supply voltage to the motor is switched on for driving the dosing pump for an actuation interval. The supply of the motor is switched off about half a cycle time before it is required to stop the motor to terminate dosing by the dosing pump. The motor is allowed to run freely in an unpowered mode for about one quarter of the cycle time after the switching off step and a DC voltage is applied to it for approximately the next one quarter cycle time to induce an eddy current is induced in a rotor of the motor to generate a counter-magnetic field for braking the rotor to a stand still.

L'invention concerne un procédé permettant d'augmenter la précision de dosage d'une pompe de dosage qui est entraînée par un moteur asynchrone, par l'intermédiaire d'un engrenage à excentrique. La tension d'alimentation du moteur est coupée environ un demi-cycle avant un arrêt désiré. Le moteur tourne alors de lui-même pendant une partie du cycle, avant qu'une tension continue lui soit appliquée pendant approximativement un quart de cycle, de sorte qu'un courant de Foucault soit induit dans le rotor, courant qui produit un champ magnétique antagoniste qui freine le rotor jusqu'à l'arrêt. L'invention concerne également une pompe de dosage qui est entraînée, par l'intermédiaire d'un engrenage à excentrique, par l'intermédiaire d'un moteur asynchrone, et dont la précision de dosage peut être augmentée grâce au procédé décrit.

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