Częstotliwościowe sterowanie napędów pośrednich przenośników taśmowych

Indirect drive in long belt conveyors can lessen the stresses in the belt and in the load bearing structure of the conveyor because of the distribution of the belt's pulling force into several components of force. The indirect drives without pouring point are interesting solutions both from the technical, and the economical points of view. Most frequently used solution is an auxiliary conveyor which drives the runners of the main conveyor. The problem in manufacturing this sort of drives is both the variability of thermal compression between the belt and runners in belt load function, and the necessity to adjust the driving velocity of the auxiliary drive's motor to the current parameters of the main belt's load. All these requirements cause the driving motors of the auxiliary drive to be powered from the frequency converter Typical methods of frequency changer control do not always provide satisfactory results in the difficult working conditions of the auxiliary drives, the use of positioning system of induction motors was suggested. Conducted laboratory tests of the drives showed the advisability of usage of machine tool motor for the realization of indirect drive for belt conveyors.