Abstract <p>This article considers an electromagnetic-impact unit powered by an industrial-frequency voltage source, in which a working cycle with a free-run striker is used as an effective measure to increase the impact energy. A simulation dynamic model of a synchronous electromagnetic-impact unit with a two-way free-run striker is developed. The model can be used to analyze electromechanical processes that take into account the deformation of elastic connections, as well as force and impact interactions of structural elements of a mechanical oscillatory system. An example of a dynamic calculation in the form of time diagrams reflecting the working process of an impact unit with three degrees of freedom of a mechanical system is considered. The main results and conclusions are obtained using simulation modeling in the MATLAB Simulink program with the construction of a structural diagram and preliminary calculation of the magnetic field. Comparison of the calculated and experimental data indicates that the accuracy of the created model is sufficient for practical application.</p>