CONSTRUCTION AND ANALYSIS OF A MULTIPHYSICAL MODEL OF A TWO-PULL ELECTROMAGNETIC EXCITER OF LOW-FREQUENCY OSCILLATIONSS

A push-pull electromagnetic exciter of low-frequency mechanical oscillations (EMF LFMO) with two identical resonant circuits, each of which consists of an inductance and is sequentially connected through its capacitor to the power supply circuit, is considered. To convert the supply voltage frequency (50 Hz) at the input to the low-frequency range of mechanical oscillations, the parameters of the resonant circuits are adjusted. The results of a model study of the object in the COMSOL MULTIPHYSICS environment are presented, obtained taking into account the assumption of conditioned linearity of passive elements in the resonant circuits of an AC electric circuit. Animations of the processes of beating of the input high-frequency signals and their smooth modulation in the low-frequency region at the output and an animation of mechanical oscillations of the anchor are obtained. The analysis of the modeling results for compliance with the mechanical characteristic of the oscillation exciter with the optimal shape of the active parameter at the output in interdependence with the active parameter at the input of the electromechanical system is carried out, and the evolution of the mechanical characteristic is presented: oval - ellipse - circle for all its modifications. Fundamental conclusions and practical recommendations for the application of the results of model studies of an electromagnetic exciter of low-frequency oscillations in a two-stroke design are formulated.