The calculation of parameters of electromechanical converter of a multimodule structure with a common hollow massive rotor was submitted. The structure of high-performance electromechanical converter was shown, which includes not only the elements that perform the basic functions of energy conversion of one type into another and provide biomass being processed by fractional, formative and humidity parameters, but also implements a number of related physical and chemical effects to give new properties of biomass and increase the commercial value of the product. Since the material being processed is simultaneously a load-cooling material, the heat transfer and mechanical loading of the brake and motor module are interrelated. Results of industrial tests of the converter are presented. Comparison of experimental and calculated parameters and characteristics as a whole show good convergence of the results.