Structural design of new magnetic gear with eccentric poles and analysis of parametric effects of magnetic fields
YANG Chaojun
GUO Yafei
RUAN Sunyi
Abstract：Field modulated magnetic gears can effectively avoid vibration,noise,lubrication and other problems.In order to improve the transmission stability,a new type of field modulated magnetic gear using eccentric poles was proposed.Firstly,the magnetic field modulation effect before and after adding the magnetic field modulating pole piece was analyzed by analytical method,and the expression of the air-gap magnetic density was obtained after the modulation of the permanent magnetic field.Secondly,the main structural parameters of the eccentric pole were defined,and the functional expression of the magnetization thickness of the eccentric pole was deduced.Then,the effect of the magnetic field on the air-gap magnetic gear before and after adopting the eccentric magnetic pole was analyzed by using the simulation of the finite element software,and applied Fourier decomposition to the waveform of the air-gap magnetic density for calculating total the harmonic distortion.Finally,the parametric analysis of the relation between the pole-arc coefficient of the modulating pole piece,the eccentricity of the permanent magnet,the pole-arc coefficient of the permanent magnet and the air gap magnetic density and the maximum static torque was carried out,and a prototype of the magnetic gear with an eccentricity of 0 was fabricated to validate the theoretical and simulative analyses.The results show that the structure of the eccentric poles can improve the waveform of air-gap magnetic density effectively and improve the stability of the transmission.
Keywords：Eccentric poleMagnetic gearAir gap magnetic densityTotal harmonic distortion
Publication Date：2025-11-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 10-18 )