Electromagnetic performance analysis of axially magnetized magnetic gear with H-type demagnetization rings for flux leakage suppression

Axial magnetic gears, recognized for their high torque at low speeds, face significant challenges, such as magnetic leakage and torque ripple, which impede their transmission stability and efficiency. To address these challenges, this paper introduces an innovative H-type demagnetization ring magnetization axial magnetic gear. This axial magnetic gear aims to enhance torque density and minimize magnetic leakage. H-type demagnetization blocks are employed to augment the transverse magnetic path. The performance of this novel gear is compared with the conventional T-type gear using comprehensive finite-element modeling. The analysis focuses on the magnetic field distribution, air-gap magnetic flux density, spatial harmonics, and torque characteristics. Results obtained in this study indicate the superiority of the H-type gear in achieving a higher static torque density and a lower torque ripple, making it a promising solution for efficiency improvement in various industrial applications. The objective of this study is to empirically validate the enhanced performance of the H-type gear, and to contributing to the advancement of axial magnetic gear technology.