Dynamic compensationbased control of industrial metering pumps

CHEN Yiheng, WANG Shenjian, TAO Liuqing, HE Defeng, YU Shiming

（College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China）

Abstract: Aiming at the problems of low control accuracy and the overheated driving module under load fluctuation, a dynamic compensation method of digital frequency conversion was presented by the working model of the metering pump and the control method of the driving motor. Firstly, using the Hall magnet and the Hall sensor, the speed fluctuation of the driving motor to a metering pump observed in real time, and the motor speed fluctuation was converted into time fluctuation. Then the torque current of the changed time loop through antiintegral saturation PI algorithm was regulated, and the same method was used to regulate motor voltage in current loop in order to realize the dynamic compensation of the motor speed. Finally, control accuracy of metering pump quantitative control precision and driving motor temperature rise before and after dynamic compensation were compared and analyzed. The results indicate that the method is able to control driving motor effectively by dynamic compensation, it can not only reduce the metering pump’s relative error in quantitative control, but also reduce the reactive power loss and avoid the over heat of the driving module.

Key words: metering pumps; antiintegral saturation PI algorithm; dynamic compensation