Akademik Veri Yönetim Sistemi
2023 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2023 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), İstanbul, Türkiye, 1 - 02 Eylül 2023, cilt.1, ss.1-9
Increasing the speed of an electric machine is a means of increasing its
power density. However, increasing the speed is challenging due to the
rotor’s mechanical stability issues. In interior permanent magnet
synchronous machines (IPMSMs), the radial ribs are required to reduce
stress concentrations and improve the rotor’s durability. The thickness
of radial ribs is of great importance in minimizing the rotor leakage
flux. Thus, radial rib thickness must be adjusted as a function of
geometrical variables, maximum rotational speed, and material
characteristics during machine optimizations. This research proposes a
new semi-numerical approach for computing the radial rib thickness of a
V-shaped IPMSM rotor based on the rotor geometry. The calculated rib
thickness is included in the rotor model for detailed optimizations
where the effect of the rotor leakage flux is accounted for. In the
second part of the study, this model is used for a comparative study
that examines how varying the maximum speed affects the machine’s
electromagnetic performance. According to the findings, when the
stator’s outer dimensions and copper loss are kept the same, there is a
particular maximum speed and current density in which the machine shows
an optimum balance between electromagnetic and mechanical performances.
This is because the thick radial rib produces significant leakage flux
as maximum speed increases. On the other hand, lower speeds require a
larger stator volume to match high-speed performance. The approach
presented in this study can also be used to determine the suitable
stator outer dimensions for a given maximum rotational speed.