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Liquid dispensing pump system

  • US 20030091442A1
  • Filed: 11/09/2001
  • Published: 05/15/2003
  • Est. Priority Date: 11/09/2001
  • Status: Active Grant
First Claim
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1. An internal gear pump including a stepper motor coupled to a drive shaft that is coupled to a rotor meshed with an idler mounted to a head coupled to a head plate, the improvement comprising:

  • a controller linked to the stepper motor, the stepper motor imparting a stepped rotational movement to the drive shaft wherein a single 360°

    rotation of the drive shaft comprises a plurality of steps, the controller sending a signal to the stepper motor to rotate the drive shaft a predetermined number of steps, the signal causing the stepper motor to rotate the drive shaft the predetermined number of steps, the controller calculating the predetermined number of steps based upon an inputted dispense amount, the controller calculating the predetermined number of steps and generating the signal sent to the stepper motor based upon an algorithm derived experimentally that defines a relationship between dispense amount and a number of steps required for each dispense amount that is unique for each fluid to be pumped.

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