Tkachenko A. Decrease in dynamic loadings in asynchronous electric drives of armored face conveyors in operating and emergency operation

Object of research - dynamic processes in electromechanical system of the armored face conveyors in operating and emergency modes. Aim of research- identification of sources of the most intensive dynamic loadings in electromechanical system of the armored face conveyors and improvement of control systems of it on the basis of the frequency-adjustable asynchronous electric drive. Methods of research and equipment - methods of theory of the electric drive and automatic control, numerical methods of the solution of the differential equations, methods of computer simulation. Theoretical and practical results - obtained depending on the maximum dynamic loads in the chain from a place and a type of jamming taking into account kinematic schemes of the conveyor and a configuration of its electric drives; developed devices that provide an automatic reduction the dynamic loads in the conveyor chain, recommendations about their structure and control are developed. Novelty - is developed mathematical model of the electromechanical system armored face conveyor with the main factors characteristic for drives of mining machines; revealed the appearance of slowly decaying standing waves on the third resonance frequency of the mechanical system in the direct start-up of the armored conveyor from the asynchronous engine without the fluid coupling; conditions of emergence of shock loadings in a chain at the end of a working branch of the two-driving conveyor are established; the control system of the frequency-adjustable asynchronous electric drive of the conveyor which provides restriction of dynamic loadings in a chain is improved. Extent of introduction - MK "Energysaving" (Kharkov), the educational process of department of the automated electromechanical systems of NTU "KHPI" (Kharkov). Industry use - coal mining industry.