Abstract
As the technical characteristics of permanent magnets manufactured by the industry improved, they began
 to be used more often in the generation of electricity, as well as in induction devices for direct conversion of mechanical
 energy into thermal energy. To increase the efficiency of the latter, it is necessary either to increase the frequency
 of interruptions of magnetic fluxes, or to increase their intensity. In this paper, a comparative analysis
 of unbranched magnetic circuits with sources of magnetomotive force (MDS) in the form of a permanent magnet
 and in the form of a coil with a current (electromagnet) is carried out in order to quantify the effect of air gaps on
 the change of magnetic fluxes in these circuits. The results of this comparative analysis make it possible to optimize
 the choice of the type of magnetic circuits in induction devices for direct conversion of mechanical energy into
 thermal energy.
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