Design of Wave Winding with Bar Wires for Six-Phase Interior
Permanent Magnet Traction Machines 14-11-01-0006
This also appears in
SAE International Journal of Electrified Vehicles-V131-14EJ
This article aims to analyze different six-phase winding configurations with
rectangular bar wires to be used in an interior permanent magnet machine for an
electrified vehicle application. Rectangular bar wires allow a higher slot fill
factor compared to conventional round wires, and they are currently utilized in
wave windings in the traction motors of commercial electrified vehicles.
Combining bar wire winding with a six-phase configuration can lead to achieving
a higher power density and more reliable operation in a traction motor. However,
applying bar wires for a six-phase operation may raise further complications in
the winding design, which requires special care to prevent complexities and
potential failure points. In this article, the full-pitch wave winding pattern
is discussed and then utilized for the implementation of pure six-phase and dual
three-phase windings. The potential implementation process and the type of
connections between different winding segments have also been considered.
Finally, a comparison between the two winding arrangements has been presented in
terms of complexities in the mechanical design and implementation. In order to
find the optimal winding design, a MATLAB script has been provided, which
enables investigating all possible winding configurations for both pure
six-phase and dual three-phase windings.