A constant power cutting method of continuous shearer based on fuzzy control

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.