Abstract
This work proposes an approach to design fractional-slot permanent magnet synchronous machines (FSPMSMs) equipped with phases made up of one coil parallel branches. These machines exhibit attractive potentialities, especially their enhanced open-circuit fault tolerance capability. Beyond their intrinsic fault tolerance, an open-circuit affecting the targeted topologies leads to a torque step-down limited to the one developed by the concerned coil rather than the torque produced by the total phase in FSPMSMs equipped with phases made up of series-connected coils. Furthermore, these topologies are suitably-adapted to low-voltage power supply that makes them viable candidates in automotive applications. This potentiality is by far vital in battery electric vehicles with the risk of electrocution in case of accident totally-eradicated thanks to the reduction of the DC bus voltage. Part 1 of the developed work is aimed at a star of slots-based identification and topological characterization of the FSPMSMs enabling the arrangement of the armature phases according to one coil parallel branches. The study distinguishes the topologies with odd and even number of phases, arranged in single- and double-layer slots. A case study is treated using a 2D finite element analysis and validated by experiments.
Highlights
M UCH attention is currently given to fractional-slot permanent magnet synchronous machines (FSPMSMs) to equip a variety of applications covering a wide range of power, from medical actuators and household appliances till wind turbines, going through electric and hybrid vehicles [1]–[5]
This work proposes an approach to design fractional-slot permanent magnet synchronous machines (FSPMSMs) equipped with phases made up of one coil parallel branches. These machines exhibit attractive potentialities, especially their enhanced open-circuit fault tolerance capability. Beyond their intrinsic fault tolerance, an open-circuit affecting the targeted topologies leads to a torque step-down limited to the one developed by the concerned coil rather than the torque produced by the total phase in FSPMSMs equipped with phases made up of series-connected coils
Part 1 of the developed work is aimed at a star of slots-based identification and topological characterization of the FSPMSMs enabling the arrangement of the armature phases according to one coil parallel branches
Summary
M UCH attention is currently given to FSPMSMs to equip a variety of applications covering a wide range of power, from medical actuators and household appliances till wind turbines, going through electric and hybrid vehicles [1]–[5]. The approach introduced in [28] is deeply rethought in this work with emphasis on FSPMSMs equipped with one coil parallel branches made phases, considering: 1) both odd and even number of phases while only odd number of phases has been treated in [28], 2) a systematic identification allied to a topological characterisation of all candidates that makes it possible the phase arrangement according to one coil parallel branches, while limited number of slot-pole combinations have been considered in [28], 3) an investigation of the possible circulation of harmonic currents in the loops resulting from the parallel connection of the coils of each phase which affects the machine performance. It is to be noted that, for a given number of phases, the second approach exhibits a higher Kwslp than those given by expressions (2) and (4)
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