Effects of Undesirable Features of A Double Stator Switched-Flux Permanent Magnet Machine

Anotace: A comparative study of undesirable effects of double stator switched-flux permanent magnet machine would be investigated, considering its rotor pole numbers. The predicted finite element analysis (FEA) machine parameters are: unbalanced magnetic force (UMF), total harmonic distortion (THD), torque ripple, cogging torque and static torque. It is revealed that the machine types that have odd number of rotor poles have lower undesirable machine properties such as: low cogging torque, low torque ripple and low total harmonic distortion compared to the ones that have even number of rotor poles; though, with higher amount of unbalanced magnetic force on the rotor. More so, the machine types having odd number of rotor poles would have higher air gap flux density magnitudes; and would also exhibit better average torque per magnet usage, which is desirable for reduced cost implications.