DISTRIBUTION OF CURRENTS IN THE «INDUCTOR SYSTEM WITH AN ATTRACTING SCREEN» AND A CIRCULAR SOLENOID UNDER DIFFERENT WORKING FREQUENCIES
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 80, Issue
Abstract
The action principle of the «inductor system with an attractive screen» (ISAS), excited by an external source of the magnetic field, is explained with the use of the most illustrative physical idealization, which takes place with intensive penetration of operating fields. It is shown that in the proposed ISAS only attraction forces should be excited, the repulsive forces will be absent. Goal. The purpose of the work is to justify the system's ability with a simple physical model that adequately reflects the properties of this device and determine the characteristics of electromagnetic processes in ISPE with external excitation at arbitrary frequencies of the operating fields. Methodology. A system of equations was used, given in the form corresponding to the formu-lation of the electrodynamics’ problem under con-sideration. The screen and billet metals were as-sumed to be nonmagnetic. In this formulation, it was possible to obtain estimates of the minimum values of the attractive forces, since only Ampere's law was taken into account and the component due to the possible magnetic properties of the sheet metals was not taken into account. Results. The influence of the acting fields’ frequencies on the distribution of the induced currents in the screen and in the blank is investigated. It is shown that the practical value for the design of inductor systems with an attractive screen has the form of phase and radial dependenc-es of induced currents. This is due to the fact that the phase dependences will determine the amplitudes of the excited forces of attraction, and the radial - their spatial distributions. Originality. Numerical estimates of the space-time distribution of the linear current density in the screen and sheet billet metal at various operating frequencies and spatial-temporal distribution of the bulk current density induced in the metal of the sheet billet are numerically estimated. Comparison of the distribution curves of currents induced in the workpiece and the screen with the phase dependence of the linear cur-rent density in the inductor allows to conclude that when the frequencies of the acting fields decrease, the temporal forms of the induced currents, both in the screen and in the sheet billet, undergo significant changes. Practical value. It is shown that the value of high or low frequency for the metals of the screen and workpiece in the considered inductor system is quantitatively determined by the value of their specific electrical conductivity. The approximate ratio equality of frequencies and specific electrical conductivities is of practical importance in the design of inductor systems with attracting screens to assess the correspondence of the frequency ranges of the operating fields to the electro physical parameters of screen and billet metals.
Authors and Affiliations
E. Chaplygin, O. Yeryomina, V. Kolesnyk
Keywords
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