Fault-Tolerant Fractional-Slot PMSMs with One Coil Parallel Branches Made Phases – Part 1: Identification and Topological Characterization

Thiswork dealswith fractional-slot permanent

magnet synchronous machines (FSPMSMs) equipped with

phasesmade up of one coil parallel branches. These exhibit

attractive potentialities, especially their enhanced opencircuit

fault tolerance capability. Furthermore, these topologies

are suitably-adapted for low-voltage power supply that

makes them viable candidates for possible integration in

the 42V automotive technology. This potentiality is further

highlighted in battery electric vehicleswhere the passenger

safety is greatly improved in case of accidents thanks to

the reduction of the DC bus voltage. Part 1 of the work is

aimed at a star of slots-based identification and topological

characterization of the FSPMSMs that make it possible

the arrangement of the armature phases according to one

coil parallel branches. The study distinguishes the case of

odd and even number of phases, arranged in single- and

double-layer slots. The paper is achieved by a case study

incorporating an experimental validation.