多机驱动带式输送机功率平衡控制方法

Power balance control method of multi-motor driving belt conveyor

针对采用液体黏性软启动装置的多机驱动带式输送机在启动过程中各电动机功率不平衡的问题,提出了一种多机驱动带式输送机功率平衡控制方法:利用电流预测算法预测电动机电流,以提高控制响应速度;根据各电动机之间的预测电流偏差,通过比例微分控制算法调节液体黏性软启动装置所配用的控制泵给定频率,进而改变电动机电流,使各电动机电流差控制在一定范围内。现场应用结果表明,在带式输送机空载和重载启动时,该方法均能对电动机过大电流进行抑制调节,实现带式输送机平稳启动和功率平衡。

In view of problem of motor power unbalance in process of starting of multi-motor driving belt conveyor which uses hydro-viscous soft starting device,apower balance control method of multimotor driving belt conveyor was proposed.A current prediction algorithm is used to predict motor current in order to improve control response speed.According to difference between the motor predictive currents,given frequency of control pump which is connected with the hydro-viscous soft starting device is adjusted through proportional derivative control algorithm,then the motor current is changed,so difference between the motor currents can be controlled in a certain range.The field application result shows that the method can restrain excessive current of motor whether no-load or heavy-load starting of the belt conveyor,which achieves smooth start and power balance of the belt conveyor.