Magnetic equivalent circuit modelling of coaxial magnetic gears considering nonlinear magnetising curve

Abstract

It is necessary to have a model to design magnetic gear (MG) optimally and to investigate the effective parameters on its performance. This study proposed a two-dimensional (2D) model to predict the magnetic components of coaxial MG (CMG). This model is based on the mesh analysis method considering core nonlinear B-H curve. In the proposed model, the radial and tangential components of flux densities, magnetic fluxes as well as the inner/outer rotor torque are estimated by extraction of the magnetic equivalent circuit (MEC). The effect of non-linear B-H magnetising curve is considered on the MEC model and it is compared with linear core (constant probability). Furthermore, the dynamic model of CMG is presented and its torque-angle curve and consequently its pull-out torque is obtained. To validate the proposed model, the 2D MEC model results are compared with results of finite element method analysis.