Performance Analysis of a Six-bar Linkage Pumping Unit Based on a Small Fluctuations Load Shape

Crank shaft net torque of pumping units is a volatile alternating load,while output torque of a general motor is basically constant.Thus,load characteristics of pumping units and motors are not able to harmoniously match each other;this resulted in a higher output of the motor,lower efficiency,and higher energy consumption of the pumping units.A new six-bar linkage pumping unit is presented according to moment-changing theory.It allows to adjust automatically following the changes of polished rod load,and a...