The research of the elevator electromechanical system in terms of reducing the arising dynamic loads

The electromechanical model of an elevator is developed in the article. The electromechanical model of an elevator is based on a three-mass system, which takes into account the most considerable resilient connections between the moving masses. It makes possible to evaluate the oscillations, which are related with considerable oscillations in electromagnetic torque during direct start of the asynchronous motor by the power supply. Using a model, which are created in the Matlab Simulink software the transitional processes of the operation, the forces and the moments elevator have been researched by using such operation modes as lifting and lowering a loaded and empty cabin. The negative impact of significant fluctuations in resilient moments, which are several times higher than the nominal ones is determined. The important aspect of the research is the using of a two-speed AC motor in the model. This gives reason to the implement of the non-standard method of eliminating oscillations by starting the motor first at a reduced speed, by connecting a low-speed multi-pole winding, and then by switching to a high-speed winding and moving the elevator to a specified floor. The proposed method reduces the resilient moment oscillations by half, which is a useful result for practical applications in the elevator’s facilities.