Analysis of rotor eccentricity on permanent magnet synchronous motor characteristics

This paper describes the influence of rotor eccentricity on permanent magnet synchronous motor characteristics by a magnetic field analysis and several experiments. The rotor eccentricity unbalances the magnetic force and thus increases the mechanical loss. Furthermore, a circulating current generated in two three-phase windings connected in parallel results in an increase of electric power loss in the permanent magnet synchronous motor. Therefore, we presented that the flux barrier rotor is effective to reduce the harmful effect of the rotor eccentricity.