Open AccessOptimisation method to maximise torque density of high‐speed slotless permanent magnet synchronous machine in aerospace applications
Author(s) -
Lee Dongsu,
Jin Austin,
Min ByungHoon,
Zheng Lijun,
Haran Kiruba
Publication year - 2018
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2017.0873
Subject(s) - cogging torque , torque , torque ripple , rotor (electric) , finite element method , magnet , control theory (sociology) , harmonics , copper loss , torque density , mechanical engineering , direct torque control , engineering , computer science , structural engineering , physics , electrical engineering , control (management) , voltage , artificial intelligence , induction motor , thermodynamics
This study presents an optimisation method for slotless permanent magnet synchronous machines to maximise torque density. The slotless structure with outer rotor and Halbach array has been selected to limit iron losses, torque ripple, cogging torque, and high‐order harmonics. High‐speed operation compounds both ac copper loss and mechanical stress. The former causes a temperature rise in the machine, while the latter is induced by strong centrifugal forces. A finite‐element analysis‐based optimisation method that utilises a parallel multistart, mesh adaptive direct search strategy is proposed to consider ac copper loss and mechanical stress as constraint variables. Finally, the torque densities of titanium and aermet shell designs were compared to show how material selection provides a trade‐off in terms of torque production, mechanical stress, and weight.