In this paper, a new type of double-stator fluxswitching permanent magnet (DS-FSPM) machine is proposed to compare with the traditional permanent magnet synchronous machine (DS-PMSM). By using finite element method, both the steady and transient electromagnetic performances of the machine are investigated in details. The comparison shows that the DS-FSPM possesses higher air gap flux density and output torque under the same current density or the same copper loss, but it also shows that the DS-FSPM owns larger cogging torque, which will result in undesirable conditions for the electric vehicle applications. Besides, the DS-FSPM and the DS-PMSM both offers relatively higher efficiency under the same conditions. Both the theory and simulation results verify the reasonability of the DS-FSPM and the DS-PMSM, which is very essential for electric vehicles.Index Terms-Double-stator, flux-switching machine, permanent magnet synchronous machines, finite element analysis

Wireless power transfer (WPT) has been a very popular topic of research recently. In most research the coil design is based on the classical theory and the parameters of the coils are obtained by calculations or direct measurements. However, the method has its limitation when the shape and structure of the coil is complex or the coil hasn't been constructed. The purpose of this paper is to present the whole process of designing coils and building a wireless power transfer system with the finite element analysis (FEA) and with MATLAB simulation in detail. Finally the experimental results will be presented to verify the validity and reasonability of the design method.

This paper proposes a new integrated electromechanical set for extended range electric vehicles (EREVs), which is termed as brushless dual-rotor flux-switching permanent magnet (BLDR-FSPM) motor. The proposed motor incorporates the merits of stator-permanent-magnet motors and dual-rotor PM motors, offering high torque density, compact structure. Moreover, the proposed motor possesses the feature of functioning as a traction motor and generator simultaneously, which makes it possible to realize electric energy conversion under extended mileage condition. In this paper, four feasible topologies of the composite stator are described, which are named C-core, E-core, CB-core, and EB-core. Their basic electromagnetic performances are compared by 2-D finite element (FE) method, and the prediction results of the proposed motor confirms that the CB-core stator provides a more sinusoidal back EMF waveform and smaller cogging torque.Index term -Flux-switching, dual-rotor, permanent magnet, extended range electric vehicle.