工业计量泵数字变频动态补偿控制研究

Dynamic compensation-based control of industrial metering pumps

针对工业计量泵在负载波动情况下的定量控制精度和驱动模快发热问题,对计量泵的工作模型和驱动电机的控制方法进行了研究,提出了一种数字变频动态补偿方法。首先采用霍尔磁钢和霍尔传感器,实时观测计量泵驱动电机的转速变化,将电机的转速波动转换为时间波动,然后对转换后的时间环路运用抗积分饱和PI算法调节转矩电流,再运用相同的方法在电流环路中调节电压,实现了对转速的动态补偿,最后将计量泵动态补偿前后定量控制精度和驱动电机温升的测试结果进行了对比分析。研究结果表明,该控制方法可对驱动电机实施有效的动态补偿,既能减小计量泵定量控制的相对误差,又能降低无功损耗和驱动模块发热。

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 satura- tion 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.