Comparison between synchronous reluctance and interior permanent magnet motors with eccentricity

Abstract

This paper presents the finite element analysis for synchronous reluctance and interior permanent magnet machines with different eccentricity scenarios. Static and dynamic eccentricity cases are studied, as well as, a combination of them is also studied. Three different rotor structures are considered for both machines. This paper focuses on the computation of the unbalanced radial force acting on the rotor in all eccentricity scenarios. In addition, the radial forces acting on the rotor flux-barriers (i.e., in case of synchronous reluctance machine) or acting on magnets (i.e., in case of interior permanent magnet machine) are calculated. As an example, a 36-slots 4-pole machines with the same dimensions are compared. The comparison between the different rotor geometries is also carried out for all eccentricity cases.