ENERGY SAVING SYSTEM AND METHOD FOR DEVICES WITH ROTATING OR RECIPROCATING MASSES

摘要

A system and method are provided for reducing the energy consumed by a pump jack electpc motor by reducing the supply voltage to the motor when the motor would be generating energy in open loop mode By substantially eliminating the energy generation mode, the braking action of the utility grid in limiting the acceleration of the motor and system that would otherwise occur is substantially removed The motor and system will speed up, allowing the natural kinetic energy of the cyclic motion to perform part of the pumping action A closed loop controller in electrical connection with the motor computes the necessary information from the observed phase angle between the voltage and current supplied to the motor By reducing the supply voltage to the motor, the observed phase angle may be reduced to a target phase angle value.