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

The paper deals with fractional-slot permanent

magnet synchronous machines (FSPMSMs) equipped

with phases made up of one coil parallel branches. These

exhibit attractive potentialities, especially their enhanced

open-circuit 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 vehicles where the

passenger safety is greatly improved in case of accidents

thanks to the reduction of the DC bus voltage. This first part

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.