prof.dr. ,Kiev P o l y t e c M c a l Institute,Kiev,USSR. A.Leonov:ing. ,Kiev P o l y t e c M c a l Inatitute,Kiev,USSR. R.Strzelecki:prof.dr.,Technical-Agronomical Academy, Bydgoezecz, Poland S-rY Unlinear electrotechnic systems with electric power invertors can be described by equations with constant or convertible commutation moments depending on the kind of semiconductor elements models. To investigate such systems a nualitively new theory is needed nowadays, which is capable to give comparatively deep analysis of the characteristics and perculiarities of the studied objects behaviour. Incidental fluctuation of different guantity was recently investigated, mostly, by the help of the gualitative dynamic systems theory which didn't allow to explain the reasons and to investigate the chaotlc process structure, not using the incidental pertubations. The stochastic regimes found in determined systems, the notion of "strange attractor" feeded into dynamic systems theory, the theory of self-organization and universal M.Feigenbaum's theory creation let us come closer to the notion of the reasons of a great number of unlinear systems behaviour chaotisation. System with the digital current wtor. Let us consider a concrete example. Hodelins the main systems state and defining the bifurcation points we shall determine the modelling object transforming function from state to state depending on control parameter value and on the basis of it, we can analyse the system characteristics. Now we shall introduce the reflections, which allow to exclude the phases course behaviour troubling investigations. fi$? I During the experiment in the system with the digital current motor (DCM), control in armature circuit and in exiting circuit, working from accumulator (fig.l), there were found the regimes in which low-frequent chaotic current pulsation appeared (fig.2). The pulsation in armature circuit and im exiting circuit were fixed. Regulation was obtaind in the following way. In the regirm of current limits, wlile armature current value Ia inecreases the value of 300A. decreasing the armature current Ia, is reached by discrete increasing of exiting current Ie through definite time intervalSA (fig.3) before the moment of annature current normalisation. In such a regime the system becomes relayable and circuit armature current behaviour and exiting circuit can be not only of pulsation but of stochastico -self -pulsation chara-1
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