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A promising way to optimize the technical and economic characteristics of an ac electric drive is to have it designed based on an executive synchronous motor with an increased number of stator winding phases. However, due to the specific nature of the m-phase (m > 3) synchronous motor determined by the energy transfer by a whole spectrum of spatial field harmonics, electromechanical systems should be developed that take this feature into account. A method to study the adjustment characteristics of an m-phase synchronous motor is used, which is based on spectral vectors of electromagnetic parameters reduced to spatial field harmonics. A multichannel concept of realization of an m-phase synchronous electric drive is proposed, which enables targeted formation of the electromagnetic state of a synchronous motor through all its energy channels as a control object. Various ways of its implementation are considered. The advantages of the multiphase synchronous motor can be realized based on of the forced mutual orientation of the flux linkage vectors and the stator current for higher spatial harmonics, which provides the generation of additional constant components of the electromagnetic torque. This design of electric drives is advisable, in particular, for mobile installations with low-voltage (standalone) power sources. [ABSTRACT FROM AUTHOR]

One way to improve the technical and economic characteristics of a synchronous electric drive lies in constructing it on the basis of an actuating motor with an increased number of phases. However, the specifics of an m-phase (m > 3) synchronous motor, which are associated with the transfer of electromagnetic energy by a whole spectrum of spatial harmonic fields, poses the problem of developing an automatic control system that takes these features into account. A method is used for calculating 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. An approach to the study and calculation of the energy characteristics of an m-phase synchronous motor for various control laws is proposed, which is implemented on the basis of equations of its reciprocal computational equivalent circuit. Results of an investigation of engine main energy characteristics for various control laws along the main energy channel are presented. To realize an advantages of a multiphase synchronous motor, it is necessary to force the orientation of required mutual arrangement of the flux-linkage vectors and the stator current for higher spatial harmonics, which can be implemented on the basis of a control-system design multichannel principle. [ABSTRACT FROM AUTHOR]

The rapid spread of electric vehicles is pushing for more and more compact and reliable e-axle architectures. In this scenario, the integration of the on-board battery charger with the traction drive can be a feasible way to reduce the embedded volume and number of components. Anyway, integrated chargers often present safety issues due to the absence of an isolation stage. In this work, a solution is proposed for integrating the on-board battery charger with the traction drive of road electric vehicles equipped with a 6-phase traction motor drive. The proposed charger is deeply integrated within the e-drive powertrain, to reduce the cost and volume of the e-axle with respect to non-integrated solutions, but still providing galvanic insulation, differently from all fully integrated charger in the literature. Dedicated control strategies are developed and tested for regulating the AC grid current at unitary power factor and low THD, and to avoid torque production or rotor movement during charging independently from the rotor position. Extensive simulation results show the feasibility of the proposed solution, together with a proof-of-concept validation on a commercial traction motor.