To solve the pumping units motor energy consumption problem

a constraint relational mode of power factor

control angle and delay angle

and automatic control method are proposed.Controller of pumping unit is designed based on self-learning algorithm.The design adopts current voltage adjusting technology

samples the signal of phase angle between voltage and current

analyzes the signal with self-learning algorithm

adjusts the direction and the size of thyristor control angle to change working voltage of motor

so as to save energy efficiently.Testing results show that motor average effective power loss decreases by 14.95%

average none effective power loss decreases by 30.42%.