Patent ID: 9689383
Date: 2017-06-27
CPC Classifications: F04B,H02P

Claim:
1. A system for controlling a reciprocating electric submersible pump (“RESP”) operated by an alternating current (“AC”) powered linear motor, the system comprising: a) means for rectifying a supply of AC power into direct current (“DC”) power; b) means for pulse-width modulating the DC power into pulse-width modulated (“PWM”) AC power, the modulating means operatively coupled to the linear motor; and c) means for supplying a control signal to the modulating means wherein the control signal is configured to control the modulating means to supply the PWM AC power to the linear motor; wherein the control signal is configured for controlling the frequency of the PWM AC power supplied to the linear motor whereby the frequency of the PWM AC power is different when linear motor is moving on an upstroke than when the linear motor is moving on a downstroke.