Influence of an Excitation Source on the Power Indicators of a Linear Pulse Electromechanical Converter of Induction Type

Abstract

The purpose of the article is to evaluate the efficiency of an induction-type linear pulse electromechanical converter (LPEC) when operating in shock-power mode and excitation from an alternating voltage source (AVS) in comparison with excitation from a capacitive energy storage (CES). A mathematical model of an induction-type LPEC has been developed both when excited by a unipolar pulse from a CES and from an AVS using lumped parameters of the windings, which takes into account the interrelated electromagnetic, mechanical and thermal processes. It has been found that when the LPEC is excited from the AVS with a voltage frequency of 50 Hz, the electrodynamic force takes on a periodic decaying character with a significant prevalence of positive components of forces over negative ones. The maximum value of the force is much less, and the value of its impulse is much greater than in the LPEC, excited from the CES. With an increase in the frequency of the AVS voltage from 50 to 150 Hz, the highest value of the current density of the inductor winding decreases, and in the armature winding it increases. The greatest values of force and impulse of force are realized at a voltage frequency of 150 Hz. With an increase in the AVS frequency, the relative indicator of the efficiency of the LPEC increases. References 15, figures 4.

Influence of limiting the duration of the armature winding current on the operating indicators of a linear pulse electromechanical induction type converter

“…Studies show that due to the phase shift between the excitation current in the inductor winding and the induced current in the short-circuited armature winding, in addition to the initial repulsion EDF, the following attractive EDF occurs [17]. As a result, the operating performance of the converter is reduced [18]. Attractive EDF occur due to a change in the polarity of the induced current in the armature winding, while the polarity of the excitation current in the inductor winding may remain unchanged.…”

“…Solutions of the equations for currents in the converter windings in recurrent form are presented in [18]. The displacement h z and the speed v z of the armature winding relative to the inductor winding, presented in a recurrent form [10], take into account the instantaneous value of the axial EDF between the windings:…”

Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration

“…Consider an electromechanical induction accelerator, in which the windings are tightly wound with round copper wire and made monolithic by impregnation with epoxy resin, followed by its hardening. To take into account the interrelated electrical, magnetic, mechanical and thermal processes, as well as a number of nonlinear dependencies, for example, of resistance on temperature, we use the lumped parameters of the windings, and the solutions of the equations describing these processes will be presented in a recurrent form [16]. The mathematical model of the EIA takes into account the changing magnetic coupling between the windings during the excitation of the inductor winding.…”

“…The change in the spatial position of the armature winding is taken into account by the change in flux linkage Ψ between the windings [16]:…”