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The main transmission system of a scraper conveyor direct-driven by the high-power permanent magnet synchronous motor (PMSM) is taken as a study object. With the effect of the nonlinear friction torque caused by the nonuniformity of the transported coal quality in the operation process considered, the torsional vibration bifurcation mechanism and the corresponding control measures for the main transmission...
A composite sliding mode control based on the load characteristic of the permanent magnet direct-driven system is presented for a mining scraper conveyor. First, the mathematical model of a permanent magnet synchronous motor is established based on the coordinate transformation theory. Subsequently, the soft switching sliding mode observer (SS-SMO) is designed to observe the change of load torque...
To achieve automatic retractable tail frame of scraper conveyor, we applied fuzzy control theory to the hydraulic system of the retractable tail frame, established transfer function model of electromagnetic valve-controlling-hydraulic cylinder, designed fuzzy controller, and carried out simulation of the system using SIMULINK in this paper. Through simulation, we compared the dynamic performance of...
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