Minimax strategy of mechatronic converters efficiency improving relative to error decrease with velocity increase at the same time provides common dataware level rise. The analysis of usage possibilities of different type position transducers (PT) gives the advantages of resolvers. The subsequent processing of their output signals is performed by "Resolver-to-Digit" Converter (RDC) which provides displacement digital equivalent and digital or analog signals specifying its velocity and acceleration. With appearance new electronic component, including microcontroller, for increasing of accuracy of the measurements of the corner of the tumbling resolver possible to use such methods, which earlier realize was not on. Given article contains the offers about the most further development of the technical decisions for RDC of the corner. Replaceable elementary substracting section, traditionally used in all, without exception, schemes of the automatic regulation, on more "intellectual" statistical section, possible avoid the influence signals in sidebar to feedback on accuracy of the transformation.

The work is aimed at studying approaches and developing principal regulations when choosing the sites intended for constructing underground nuclear small power plants in geological formations. The research methodology provides for analysis and summarizing international and Russian experience in choosing the sites for the placement of radiation hazardous facilities. Results. The work gives the approaches when choosing the sites intended for radiation hazardous facilities proposed by IAEA in Russia and abroad. The formation of criteria complete, their specific weight and an integrated assessment of impacts of an energy object on the environment is of importance in the site choosing procedure. The several criteria characterising the site are different for the surface and underground placement of a nuclear plant. The underground placement of a nuclear plant is a determining factor in protecting against undesired external and internal impacts. The authors have proposed an algorithm of choosing the sites for underground small nuclear power plants based on a limited number of criteria. Conclusions. The approaches used for choosing the sites have similar algorithms. The site choosing procedure pays a lot of attention to formation of criteria and an integrated assessment of impacts of an energy object on the environment. The underground placement of energy objects improves their security that allows decreasing a number of observed criteria when choosing the sites.

Resolver is a 2-phase micromachine Resolvers are brushless type (Fig. 1) that is, the rotor excitation is ring transformer (RT) coupled to the shaft rotor winding. Many resolver applications operate with high speeds where the velocity error is significant source of measurement errors. Also, the signals of resolver are affected by the switching