Multi Three-Phase Hairpin Windings for High- Speed Electrical Machine: Possible Implementations

Abstract—This work provides an in-depth critical analysis related to the feasibility of combining multi three-phase winding
layouts with the ever-spreading hairpin technology. After an introduction on the advantages and challenges of both hairpin
and multi-phase windings, more details on how these two technologies can be combined are provided. Then two similar
stator geometries, with 72 and 96 slots, are analyzed in detail exploiting an 8 poles permanent magnet – assisted synchronous
reluctance motor for traction applications. A relevant set of feasible winding configurations are modelled and analyzed
through finite element simulations. For every machine, a breakdown of the power losses is provided and compared
against that of the same machine topologies having randomwound windings with stranded round conductors. The main
results and possible solutions to increase the machine performance are then provided.

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