Hybrid Asymmetric PM Inner Rotor for Coaxial Magnetic Gears: A Cost-Effective Design with Reduced Cogging Torque

This paper presents a novel coaxial magnetic gear design featuring a hybrid inner rotor that asymmetrically combines rare-earth (NdFeB) and ferrite permanent magnets. The design and optimization process utilizes a coupled Finite Element Method (FEM) and Genetic Algorithm (GA) methodology, implemented within the ANSYS Maxwell ۲۰۲۱-R۱ software. This integrated approach enables high-fidelity electromagnetic simulation, with the GA efficiently navigating the complex parameter space to optimize for torque density, cogging torque, and a cost-adjusted magnet volume. The optimized design achieves a significant ۸۸.۴۵% reduction in cogging torque and substantially lowers iron and eddy current losses by ۴۶.۷۲% and ۵۴.۱۹%, respectively. The analysis also includes a mechanical integrity assessment using finite element analysis, which establishes a safe maximum operational speed. While the hybrid strategy results in a lower average torque due to a reduced volume of magnetic material, a holistic performance evaluation using a normalized objective function demonstrates an overall superiority of ۴.۵۲% over a conventional design.

کلیدواژه ها:

Magnetic gear ، ferrite ، rare earth magnet ، finite element analysis ، hybrid PM