Equivalent Magnetic Network Model for Dual-Winding Dual-Flux-Concentrated Magnetic-Field-Modulated Brushless Compound-Structure Machine

As a compound structure machine, dual-winding dual-flux-concentrated magnetic-field-modulated brushless compound-structure machine (DDMFM-BCSM) could achieve function of magnetic-field modulated brushless double-rotor machine (MFM-BDRM) and permanent magnet synchronous machine (PMSM) at the same time, which means it could be applied to replace the combination of planetary gears and motors in hybrid electric vehicles (HEVs). Finite element method (FEM) could realize accurate analysis of DDMFM-BCSM while it has disadvantage of complex modeling and long computing time. To achieve fast analysis and design of DDMFM-BCSM, equivalent magnetic network (EMN) model is built in this paper. After meshing of each component, radial and tangential reluctance and magnetomotive force (MMF) could be obtained. Then EMN model could be analyzed by solving EMN equation system. Based on magnetic flux distribution from EMN model, performance of DDMFM-BCSM, including flux density, flux linkage, back EMF, torque and power factor, could be calculated. Comparison shows that result of EMN model is in good agreement with that of FEM. Finally, a DDMFM-BCSM prototype is manufactured and tested.