Computer Modeling of a Multimotor Electric Drive System in the MatLab Suite

The article presents a multimotor electric drive system of a roadheader. We made a computer model in the MatLab suite using a Simulink block library and the SimPowerSystems application. An AM-75 roadheader was chosen for the study. We provided a description of the circuit diagram of the primary electric equipment of the roadheader that includes motors of the boom-type implement, rotating flight conveyor, and the picker with two pallet handles. Additional parameters of asynchronous motors, such as active resistances and inductances of the stator and rotor winding, inductive coupling, reduced power, rated current, and structural and winding factors of motors were calculated for the modeling purposes using the Mathcad software. We developed a computer model of direct start of all the asynchronous motors with a production process-based interconnection. Modeling results are presented as time graphs of the primary motor parameters: angular frequency of revolution and electromagnetic torque. We obtained mains voltage and current graphs, as well as an active power consumption graph. The obtained results were qualitatively assessed by determining the relative error of the modeled parameters and the calculated data. In the process of evaluation and analysis of the modeling results, we identified insignificant errors in motor parameters. This indicates a faithful realization of the computer model and a possibility of using it for engineering calculations.