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Energy Saving System and Method for Devices with Rotating or Reciprocating Masses

  • US 20100320956A1
  • Filed: 09/01/2010
  • Published: 12/23/2010
  • Est. Priority Date: 09/14/2007
  • Status: Active Grant
First Claim
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1. A method of saving energy for a pump jack with a counterweight disposed with a well, comprising the steps of:

  • supplying voltage and current from an electric utility grid to an electric motor connected with the pump jack;

    rotating the pump jack counterweight with said electric motor;

    observing the phase angle between the voltage and current supplied to said motor;

    comparing the observed phase angle with a target phase angle; and

    reducing the supply voltage to said motor when the observed motor phase angle is greater than the target phase angle.

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