Vestnik of Samara State Technical University. Technical Sciences SeriesVestnik of Samara State Technical University. Technical Sciences Series1991-85422712-8938Samara State Technical University10028010.14498/tech.2022.1.8Research ArticleDeterminationturnsamountandcoils scheme connection of the secondary winding a three-phase-multiphase phases number transformer converterMoskalevYuriy V.<p>PhD (Techn.), Associate Professor</p>yuriyvm@mail.ruhttps://orcid.org/0000-0002-0970-937XOmsk State Transport University160620223011181290702202206042022Copyright © 2022, Samara State Technical University2022<p>The article lists various technical devices and systems that require transformer converters of the number of phases. Increasing the number of phases can significantly improve the performance and characteristics of such devices and systems. An approach has been developed to determine the minimum coils number of the secondary winding of a three-phase-multiphase transformer converter, each phase of the secondary winding of which consists of three coils connected in series, one placed on each of the three core rods. The number of turns can be calculated for the secondary winding, the number of phases of which is more than two. An example is considered for determining the number of turns of the coils of the secondary winding of a three-phase-five-phase transformer converter. The diagram of the connection of the secondary winding of such a device is given, the calculation of the total power of the coils of the secondary winding for a given multiphase load connected as a multipath star is performed. A simulation model of a three-phase-five-phase converter has been compiled in the Matlab Simulink simulation environment. The necessary circuit for connecting the windings is implemented using single-phase transformers with different transformation coefficients. Symmetrical five-phase voltage system is obtained as the output data of the model. For a different number of phases of the secondary winding, the values of the coefficient are calculated, which allows us to estimate the number of turns required to form one phase of the secondary winding of the converter. Using this coefficient, the comparison of the number of turns of the coils of the secondary winding of the device with a different number of phases was performed.</p>phase number convertertransformeroptimizationconnection diagramnumber of turnsпреобразователь числа фазтрансформатороптимизациясхема соединениячисло витков[Kopylov I.P. Elektricheskie mashiny. M.: Yurajt, 2014. 675 p.][Hughes A., Drury B. Electric Motors and Drives: Fundamentals, Types and Applications. 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