Multi-objective tradeoff designs of rotor flux-barrier angles in a multi-layered IPM machine for aircraft drive systems

A multi-objective tradeoff design of rotor flux-barrier angles is proposed in a multi-layered interior permanent magnet (IPM) machine for aircraft drive systems. The multi-objective including the average torque at different loads, torque ripple at different loads, iron loss, and magnet eddy-current loss. Firstly, the single-objective according to the variation of rotor flux- barriers angles are investigated individually. It is hard to tradeoff design between them, because there have six targets. T hen, a novelty method synthesizes the torque on different loads, torque ripple on different loads, and total iron loss which can reduce the targets number from six to three. The center of gravity of the three points are selected as the eventual angles of rotor flux-barriers. Finally, the multi-layered IPM machine is prototyped and experimented to verify the tradeoff design results.