Comparison between synchronous machines with eccentricity: Reluctance and Permanent Magnets

This paper deals with the finite element analysis of synchronous reluctance (REL), Permanent Magnet Assisted reluctance (PMAREL), and surface mounted permanent magnet (SPM) machines with different eccentricity cases, as static, dynamic, and mixed eccentricity. Different rotor geometries are considered for both REL and PMAREL machines. This paper focuses on the computation of the unbalanced radial force acting on the rotor in case of eccentricity. Moreover, the radial forces acting on the rotor parts bordered by the flux-barriers are calculated. For generality sake, this comparison is carried out at different levels of air-gap flux density. Therefore, different load angles, different permanent magnet (PM) types, and different number of poles are considered.