A constant power cutting method of continuous shearer based on fuzzy control
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摘要: 由于煤矿井下工况复杂，连续采煤机中的截割电动机负载随机变化，导致截割电动机常常因为过载而停机。现有连续采煤机恒功率截割方法只能对较小范围的截割电动机电流实现优化，无法实现自适应调节，不能有效解决电动机过载现象。针对上述问题，提出了一种基于模糊控制的连续采煤机恒功率截割方法，通过建立截割电动机电流和行走电动机速度的模糊控制器实现行走电动机速度的自适应调节：以截割电动机实际电流与额定电流的差值和差值变化率为输入变量，行走电动机速度调节比例值为输出变量，当截割电动机电流不正常时，采用模糊控制方法调节行走电动机速度，使截割电动机电流处于额定范围，从而实现恒功率截割。验证结果表明，与线性曲线法相比，采用模糊控制后，截割电动机最大电流仅超过额定电流的9%，截割电动机电流过载次数明显减少，较好地实现了连续采煤机的恒功率截割。Abstract: Due to complicated working conditions in underground coal mine, the load of cutting motor of continuous shearer changes randomly, which often leads to shutdown of the cutting motor due to overload. However, the current constant power cutting method of continuous shearer can only optimize current of cutting motor in a small range, and cannot realize self-adaptive adjustment and effectively solve overload phenomenon of the motor. For the above problems, a constant power cutting method of continuous shearer based on fuzzy control was proposed, which could realize self-adaptive regulation of walking motor speed through establishment of fuzzy controller of cutting motor current and walking motor speed. The fuzzy controller takes the difference between actual current and rated current of the cutting motor and the difference change rate as input variables, the speed regulation proportion value of the walking motor as the output variables. When the cutting motor current is not normal, fuzzy control method was used to adjust walking motor speed to make the cutting motor current in rated range, so as to realize constant power cutting.The verification results show that compared with the linear curve method, the maximum current of the cutting motor is only exceeds 9% of the rated current after using fuzzy control, current overload times of the cutting motor are significantly reduced, and constant power cutting of the continuous shearer is well realized.
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