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Brushed motor position control based upon back current detection

  • US 20060261763A1
  • Filed: 05/23/2005
  • Published: 11/23/2006
  • Est. Priority Date: 05/23/2005
  • Status: Abandoned Application
First Claim
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1. A DC electric motor driving a water valve to rotate comprising:

  • a DC electric motor including a rotor having at least one commutator portion and at least one brush for selectively communicating electrical signals through said commutator portion;

    a current supply to said DC electric motor, and there being disturbances in a current supply signal from said current supply as said brush moves into and out oF contact with said commutator portion, a control being operable to count the disturbances in said current supply signal, and utilize said counted disturbances to predict a position of said water valve;

    said water valve may be moved by said DC electric motor between full open, full closed, and intermediate positions, and said predicted position of said water valve being utilized to stop said water valve at a desired intermediate position; and

    said predicted position also being utilized to stop said water valve at full open and full closed positions.

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