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[References: 28 tit.]

In the paper an electric drive system of series-wound universal motor powered by semiconductor converter is considered.The system characteristics and calculation procedure using spectral method of Solodovnikov and aligning procedure areshown. We derived and displayed expressions for two-dimensional non-stationary transfer functions and non-stationaryspectral characteristics of output variables of automated control system of single-phase series-wound universal motorpowered by semiconductor converter. We also show results of electromagnetic calculation of the electric drive system ofseries-wound universal motor powered by semiconductor converter for various firing angles ? of the converter, as welldependences of conduction angle ?t for varied values of rotational speed ? and load torque on the shaft of the motor