Investigation of Possibility to Stabilize Load Current of Shearer’s Cutting Electric Drive

A mathematical model of a shearer-loader with an integrated forward motion drive and an automatic control system (ACS) with a PI controller has been developed. It is shown that ACS allows reducing dynamic loads on the mechanical parts of shearer-loader electric drives in conditions of a sudden change in coal strength. The results of transient processes arising from a stepwise change in the strength of coal are presented. It is shown that there is a decrease of the ACS speed by almost 1.5-2.0 times, when the combine is working on weak coals, relative to the speed of the ACS when the combine is working on strong coals. To stabilize the speed of the ACS of the cutting current controller, it is proposed to adjust the parameters of the controller depending on the resistance of the coal to cutting. The conclusion is made that the intellectual controllers are need to be used.