One of the options to improve the technical and economic characteristics of a synchronous electric drive is to design it based on an actuating motor with an increased number of phases. However, the characteristics of m-phase (m > 3) synchronous motor associated with the transfer of electromagnetic energy by a whole spectrum of spatial harmonic fields sets the task to develop an automatic control system that considers these features. The method to calculate the characteristics of an m-phase synchronous motor in quasi-stationary modes based on the use of spectral vectors of electromagnetic parameters for its individual substructures as a control object is used. The authors have proposed an approach to study and calculate energy characteristics of m-phase synchronous motor for different control laws implemented on the basis of equations of its design equivalent circuit. The results of the study of the main energy characteristics of the engine for various control laws along the main energy channel are presented. To implement the advantages of a multiphase synchronous motor, it is necessary to force the required mutual arrangement of the flux linkage vectors and stator current for higher spatial harmonics. It can be implemented based on the multi-channel principle of control system design.