Masaharu Senoo

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.

Magnetic field analysis of a squirrel cage induction motor considering rotor skew and higher harmonics in the secondary current

This paper describes a method to analyze harmonic magnetic fields of squirrel cage induction motors considering rotor skew and higher harmonics in the secondary current. The proposed method is based on a two-dimensional finite element method. The rotor skew structure is expressed by multiple 2D finite element mesh models, produced in suitable axial positions, and the magnetic field in each mesh model is calculated by the revised secondary current taking into account the skew effect. The secondary currents, magnetic flux densities, and electromotive forces are calculated by the proposed method. Then the differences between a skewed rotor and a nonskewed rotor are discussed. From the comparison between the calculated and the experimental results, the proposed method is shown to be appropriate and useful for quantitative estimation of harmonic components of induction motors.

Influences of rotor eccentricity on permanent magnet synchronous motor characteristics

This paper describes the influence of rotor eccentricity on permanent magnet synchronous motor characteristics. Specifically, we studied the influence of rotor eccentricity on permanent magnet synchronous motor characteristics by conducting 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 in electric power loss in the permanent magnet synchronous motor.